Re: Mini-patch for cccp.c

Re: Mini-patch for cccp.c

[Thomas Koenig]

I wrote:

[...]

Playing around with checkergcc some more, I found that
expand_to_temp_buffer didn't initialize some of the members of the
FILE_BUF it returns.  Dunno wether this has any grave consequences,
but I think it's a bad idea just on general principles.

Below is a patch against the origninal 970924 cccp.c which fixes this
(it also includes the previous patch).

Tue Sep 30 16:50:55 CEST 1997  Thomas Koenig  (ig25@rz.uni-karlsruhe.de)

	* cccp.c: (struct file_buf) change system_header_p to int
          (expand_to_temp_buffer) initialize all members of obuf

 static int last_error_tick;	   /* Incremented each time we print it.  */
--- cccp.c.orig	Tue Sep 30 14:43:08 1997
+++ cccp.c	Tue Sep 30 16:05:35 1997
@@ -519,7 +519,7 @@
   /* Object to be freed at end of input at this level.  */
   U_CHAR *free_ptr;
   /* True if this is a header file included using <FILENAME>.  */
-  char system_header_p;
+  int system_header_p;
 } instack[INPUT_STACK_MAX];
 
 static int last_error_tick;	   /* Incremented each time we print it.  */
@@ -3549,9 +3549,14 @@
 
   obuf.length = length * 2 + 100; /* Usually enough.  Why be stingy?  */
   obuf.bufp = obuf.buf = (U_CHAR *) xmalloc (obuf.length);
+  obuf.nominal_fname = 0;
+  obuf.inc = 0;
+  obuf.dir = 0;
   obuf.fname = 0;
   obuf.macro = 0;
+  obuf.if_stack = 0;
   obuf.free_ptr = 0;
+  obuf.system_header_p = 0;
 
   CHECK_DEPTH ({return obuf;});
 
-- 
Thomas Koenig, Thomas.Koenig@ciw.uni-karlsruhe.de, ig25@dkauni2.bitnet.
The joy of engineering is to find a straight line on a double
logarithmic diagram.

Re: Mini-patch for cccp.c

[Jeffrey A Law]

  In message < 199709301508.QAA02218@mvmap66.ciw.uni-karlsruhe.de >you write:
  > Below is a patch against the origninal 970924 cccp.c which fixes this
  > (it also includes the previous patch).
  > 
  > Tue Sep 30 16:50:55 CEST 1997  Thomas Koenig  (ig25@rz.uni-karlsruhe.de)
  > 
  > 	* cccp.c: (struct file_buf) change system_header_p to int
  >           (expand_to_temp_buffer) initialize all members of obuf
I installed the second hunk of this patch.

A couple ChangeLog notes.

The colon goes immediately after the first close paren.  ie

	* file (blah): Some change.

End sentences with a period.

The second line of a change should start with a single tab.

I've fixed these problems for the patches I've already installed.

Thanks!
jeff

Re: Mini-patch for cccp.c

[Thomas Koenig]

I wrote:

[...]

Playing around with checkergcc some more, I found that
expand_to_temp_buffer didn't initialize some of the members of the
FILE_BUF it returns.  Dunno wether this has any grave consequences,
but I think it's a bad idea just on general principles.

Below is a patch against the origninal 970924 cccp.c which fixes this
(it also includes the previous patch).

Tue Sep 30 16:50:55 CEST 1997  Thomas Koenig  (ig25@rz.uni-karlsruhe.de)

	* cccp.c: (struct file_buf) change system_header_p to int
          (expand_to_temp_buffer) initialize all members of obuf

 static int last_error_tick;	   /* Incremented each time we print it.  */
--- cccp.c.orig	Tue Sep 30 14:43:08 1997
+++ cccp.c	Tue Sep 30 16:05:35 1997
@@ -519,7 +519,7 @@
   /* Object to be freed at end of input at this level.  */
   U_CHAR *free_ptr;
   /* True if this is a header file included using <FILENAME>.  */
-  char system_header_p;
+  int system_header_p;
 } instack[INPUT_STACK_MAX];

 static int last_error_tick;	   /* Incremented each time we print it.  */
@@ -3549,9 +3549,14 @@

   obuf.length = length * 2 + 100; /* Usually enough.  Why be stingy?  */
   obuf.bufp = obuf.buf = (U_CHAR *) xmalloc (obuf.length);
+  obuf.nominal_fname = 0;
+  obuf.inc = 0;
+  obuf.dir = 0;
   obuf.fname = 0;
   obuf.macro = 0;
+  obuf.if_stack = 0;
   obuf.free_ptr = 0;
+  obuf.system_header_p = 0;

   CHECK_DEPTH ({return obuf;});

--
Thomas Koenig, Thomas.Koenig@ciw.uni-karlsruhe.de, ig25@dkauni2.bitnet.
The joy of engineering is to find a straight line on a double
logarithmic diagram.

Re: A new bug in 971114

[H.J. Lu]

> 
> On linux/x86, with egcs-971114, I got
> 
> /home/work/gnu/bin/egcs/gcc/xgcc -B/home/work/gnu/bin/egcs/gcc/ -c -fthis-is-variable -c foo.cc
> foo.cc: In function `class Int * Proc0()':
> foo.cc:9: Internal compiler error.
> foo.cc:9: Please submit a full bug report to `egcs-bugs@cygnus.com'.
> 
> egcs-971105 is fine.
> 
> 
> -- 
> H.J. Lu (hjl@gnu.ai.mit.edu)
> --
> class Int 
> {
> public: 
>   Int ();
> };
> 
> Int *Proc0()
> {
>    return new Int;
> }
> 

This kludge doesn't even look right to me. But at least, gcc doesn't
dump core now. Could someone please check it out and find a right
fix?

Thanks.


-- 
H.J. Lu (hjl@gnu.ai.mit.edu)
--
Sun Nov 16 18:34:08 1997  H.J. Lu  (hjl@gnu.ai.mit.edu)

	* init.c (build_new): Handle freeing allocated memory when the
	constructor throws only if alloc_expr is not NULL.

Index: init.c
===================================================================
RCS file: /home/work/cvs/gnu/egcs/gcc/cp/init.c,v
retrieving revision 1.1.1.5
diff -u -r1.1.1.5 init.c
--- init.c	1997/11/14 22:32:47	1.1.1.5
+++ init.c	1997/11/17 02:33:36
@@ -2720,7 +2720,7 @@
 	 new-placement, then the deallocation function is called to free
 	 the memory in which the object was being constructed.  */
       /* FIXME: handle placement delete.  */
-      if (flag_exceptions && ! placement)
+      if (flag_exceptions && ! placement && alloc_expr)
 	{
 	  tree cleanup = alloc_expr;
 

Re: egcs 1.0.3 on linux/alpha

[H.J. Lu]

> 
> I am glad to see the alpha bugs be fixed. However, with the current
> egcs 1.0.3 in CVS, there are 4 new failures:
> 
> +FAIL: gcc.c-torture/execute/compndlit-1.c compilation,  -O0 
> +FAIL: gcc.c-torture/execute/compndlit-1.c compilation,  -O1 
> +FAIL: gcc.c-torture/execute/compndlit-1.c compilation,  -O2 
> +FAIL: gcc.c-torture/execute/compndlit-1.c compilation,  -O2 -fomit-frame-pointer -finline-functions 
> 
> Can someone verify that?
> 

OOoops. My fault. Please ignore it.

-- 
H.J. Lu (hjl@gnu.org)

Re: -Wall stops compiling of egcs-1.0.3

[Joe Buck]

> I tried to compile the complete set egcs-1.0.3 (the 9.5 MB tar.gz file)
> on our Sun (SunOS 5.5). The C-compiler version is
> 
> /dr_users/noell % cc -V
> cc: SC3.0.1 13 Jul 1994
> 
> The problems was, that the make process hit an error when the option -W
> or -Wall came up.
> What can I do about it? Is there any workaround? I tried to omit this
> option, but it wouldn't work either.

No one else has seen this problem, and lots of people have successfully
built egcs on Suns.  Can you give the exact error messages you received?

A bad EH bug

[H.J. Lu]

> > 
> > > On Tue, Oct 13, 1998 at 02:48:36PM -0700, Joe Buck wrote:
> > 
> > >> Please send a complete test case (a complete program) to
> > >> egcs-bugs@cygnus.com, so that the experts will be able to run it through
> > >> and figure out what goes wrong.
> > 
> > > This demonstrates the problem quite effectively. However, I'm afraid
> > > it's rather big. I had a (quick) crack at isolating the problem with
> > > little success.
> > 

# gcc bad.cc -g
# a.out
Foo::Foo
Foo::~Foo
zsh: 12158 segmentation fault  ./a.out
# gdb a.out
(gdb) r
(gdb) r
Starting program: /home/hjl/bugs/g++/opt.3/a.out 
Foo::Foo
Foo::~Foo

Program received signal SIGSEGV, Segmentation fault.
0x804a2b1 in __cp_pop_exception (p=0x4002fbaa)
    at /home/work/misc/gnu/src/egcs-1.1/gcc/cp/exception.cc:211
211       --p->handlers;
(gdb) bt
#0  0x804a2b1 in __cp_pop_exception (p=0x4002fbaa)
    at /home/work/misc/gnu/src/egcs-1.1/gcc/cp/exception.cc:211
#1  0x804947e in Base::dispatch (this=0xbffffc17, x=0) at bad.cc:80
#2  0x80494e9 in main () at bad.cc:101


BTW, it failed on Solaris/Sparc. But it works on HP-UX 10.20. It seems
it affects all platforms with DWARF2 based EH. FYI, egcs 1.0.3 is ok.
It must be a new bug. I'd like to see it be fixed in egcs 1.1.1.

Could someone please clean it up and put it into the g++ testsuite?

Thanks.


-- 
H.J. Lu (hjl@gnu.org)
---
#include <stdio.h>

class Base
{
public:
  int dispatch (int);
};

class Derived : public Base
{
};

class Foo
{
public:
  Foo ();
  ~Foo ();
  int getValue (int);
};

template<class T>
class OBObjVar
{
  T* ptr;
public:
  OBObjVar (T *p) : ptr (p) {}
  ~OBObjVar() { delete ptr; }
  T* operator->() const { return ptr; }
};

Foo * getFoo ();
Foo::Foo ()
{
  printf ("Foo::Foo\n");
}

Foo::~Foo ()
{
  printf ("Foo::~Foo\n");
}

int
Foo::getValue (int x)
{
  return x;
}

Foo*
getFoo ()
{
  return new Foo;
}

int
Base::dispatch (int x)
{
  int y = 1;

  while (y)
    {
      OBObjVar<Foo> f = getFoo ();

      try 
	{
	  y = f->getValue (x);
	}
      catch (const char *s)
	{
	  printf ("Base::dispatch: %s\n", s);
	  if (x == 0)
	    {
	      y = 0;
	      continue;
	    }

	  throw;
	}
      catch (int)
	{
	  continue;
	}

      if (y == 0)
	{
	  f->getValue (y);
	  throw "Throw an exception!";
	}

      break;
    }
  return y;
}

int
main ()
{
  Derived x;

  try
    {
      x.dispatch (0);
    }
  catch (const char *s)
    {
      printf ("Caught: %s\n", s);
    }
}

GCC 2.7.2.3 good, EGCS 1.0.3 bad for x86 subtract then test

[Jamie Lokier]

On Sun, Dec 20, 1998 at 10:38:34PM +0100, Marc Lehmann wrote:
> That means that expressions like
> 
> a-b>0
> 
> Almost always generate a seperate testl.
>
> Jamie Lokier write:
> > I even modified the code (in a private GCC) to do this for DImode
> > subtract/compare.  So there ;-)
> 
> Silly that it doesn't work (in gcc-2.7.2.3 ;)

You should have tried a-b>=0 :-)
                         ^^

The interesting thing is that the test is optimised away by GCC 2.7.3.2,
but not EGCS 1.0.3.  (Which I'd never have noticed if it weren't for
this discussion).

Here's the example program:

	extern void a (void);

	void f (int x, int y)
	{
	  if ((x -= y) >= 0)
	    a ();
	}

With GCC 2.7.2.3, it optimises to:

f:
	pushl %ebp
	movl %esp,%ebp
	movl 8(%ebp),%eax
	subl 12(%ebp),%eax
	js .L2
	call a
.L2:
	leave
	ret

With EGCS 1.0.3, -O2 it optimises to this:

f:
	pushl %ebp
	movl %esp,%ebp
	movl 12(%ebp),%eax
	movl 8(%ebp),%edx
	subl %eax,%edx
	movl %edx,%eax
	testl %eax,%eax
	jl .L2
	call a
.L2:
	leave
	ret

-mpentium etc. don't make any difference to the test.  As well is
keeping the redundant test instruction, you can also see that EGCS'
register allocation is sucking quite hard.  In fact, perhaps the
redundant spill is the reason for the redundant test.

BTW, if anyone wants my ancient DImode patch for GCC 2.7.2, ask.
Comments from the patch:

"This patch is for the i386 machine descripton of GCC 2.7.2.  It was
tested with some other changes in place, so the patch offsets may be a
little off but it should still work with an unchanged 2.7.2:

  1. Different patterns for adddi3 and subdi3.
     These use fewer move instructions in some cases (let reload
     do the work instead.  It might even be able to cope in 2.8.0).

  2. Use smaller instructions when outputting small decrements.

  3. Use the sign flag from adddi3, subdi3 and negdi2 insns, so
     they can be followed immediately by a branch.

	* i386.h (CC_NO_ZERO): New cc_status flag.
	* i386.c (notice_update_cc): Set flags for DImode ADD, SUB, NEG.
	* i386.md (adddi3, subdi3): Simplify constraints, use fewer
	explicit moves, and subtract if adding a negative constant.
	(addsi3): Subtract if adding a negative constant.
	(seq, sne, beq, bne): Take into account CC_NO_ZERO in the output
	routines for these insns."

-- Jamie

Re: GCC 2.7.2.3 good, EGCS 1.0.3 bad for x86 subtract then test

[Richard Henderson]

On Mon, Dec 21, 1998 at 10:52:13AM +0000, Jamie Lokier wrote:
> Here's the example program:
> 
> 	extern void a (void);
> 
> 	void f (int x, int y)
> 	{
> 	  if ((x -= y) >= 0)
> 	    a ();
> 	}

This is solved by a patch Jeff sent me just yesterday.


r~


From: Jeffrey A Law <law@cygnus.com>
To: rth@cygnus.com
Reply-To: law@cygnus.com
Subject: regmove change to improve x86 code
Date: Tue, 22 Dec 1998 13:23:55 -0700

Here's the patch I mentioned in the meeting.

Basically we had something like this before combine:

(set (reg1) (mem (blah))
(set (reg2) (mem (oof))
(set (reg3) (minus (reg1) (reg2))

Combine turned that into:

(set (reg3) (minus (mem (blah)) (reg2))

Which is allowed by the predicates for the subsi3 insn.

However, it loses because the first input does not match the output
operand.  This causes spills & reloads and bad code.

There were not any reg-reg copies so regmove didn't do anything with
this code.

regmove has code to try and copy a source operand into a destination
operand then change the source to match the destination.  However, it
only worked if both the source and destination operand were regs, so it
not apply in the case shown above.

The attached change allows regmove to optimize that code so that the
source and destination registers match.  As a result the number of reloads
and spills is reduced resulting in better code.

This would probably help all of our 2 address machines.  Though I have not
done any analysis.

Comments/opinions would be greatly appreciated:

	* regmove.c (copy_src_to_dest): Returns an integer now
	indicating a successful copy was performed.  Allow SRC to
	be any rtx instead of only REGs.
	(regmove_optimize): During backward pass, if a source operand
	is not a register and the destination is a register, try to copy
	the source into the destination to make them match.

	

Index: regmove.c
===================================================================
RCS file: /egcs/carton/cvsfiles/egcs/./gcc/regmove.c,v
retrieving revision 1.46
diff -c -3 -p -r1.46 regmove.c
*** regmove.c	1998/12/16 20:57:50	1.46
--- regmove.c	1998/12/22 20:16:07
*************** static int optimize_reg_copy_1	PROTO((rt
*** 42,48 ****
  static void optimize_reg_copy_2	PROTO((rtx, rtx, rtx));
  static void optimize_reg_copy_3	PROTO((rtx, rtx, rtx));
  static rtx gen_add3_insn	PROTO((rtx, rtx, rtx));
! static void copy_src_to_dest	PROTO((rtx, rtx, rtx, int));
  static int *regmove_bb_head;
  
  struct match {
--- 42,48 ----
  static void optimize_reg_copy_2	PROTO((rtx, rtx, rtx));
  static void optimize_reg_copy_3	PROTO((rtx, rtx, rtx));
  static rtx gen_add3_insn	PROTO((rtx, rtx, rtx));
! static int copy_src_to_dest	PROTO((rtx, rtx, rtx, int));
  static int *regmove_bb_head;
  
  struct match {
*************** optimize_reg_copy_3 (insn, dest, src)
*** 592,598 ****
  /* If we were not able to update the users of src to use dest directly, try
     instead moving the value to dest directly before the operation.  */
  
! static void
  copy_src_to_dest (insn, src, dest, loop_depth)
       rtx insn;
       rtx src;
--- 592,598 ----
  /* If we were not able to update the users of src to use dest directly, try
     instead moving the value to dest directly before the operation.  */
  
! static int
  copy_src_to_dest (insn, src, dest, loop_depth)
       rtx insn;
       rtx src;
*************** copy_src_to_dest (insn, src, dest, loop_
*** 617,625 ****
       parameter when there is no frame pointer that is not allocated a register.
       For now, we just reject them, rather than incrementing the live length.  */
  
!   if (GET_CODE (src) == REG
!       && REG_LIVE_LENGTH (REGNO (src)) > 0
!       && GET_CODE (dest) == REG
        && REG_LIVE_LENGTH (REGNO (dest)) > 0
        && (set = single_set (insn)) != NULL_RTX
        && !reg_mentioned_p (dest, SET_SRC (set))
--- 617,623 ----
       parameter when there is no frame pointer that is not allocated a register.
       For now, we just reject them, rather than incrementing the live length.  */
  
!   if (GET_CODE (dest) == REG
        && REG_LIVE_LENGTH (REGNO (dest)) > 0
        && (set = single_set (insn)) != NULL_RTX
        && !reg_mentioned_p (dest, SET_SRC (set))
*************** copy_src_to_dest (insn, src, dest, loop_
*** 684,702 ****
        if (REGNO_FIRST_UID (dest_regno) == insn_uid)
  	REGNO_FIRST_UID (dest_regno) = move_uid;
  
!       src_regno = REGNO (src);
!       if (! find_reg_note (move_insn, REG_DEAD, src))
! 	REG_LIVE_LENGTH (src_regno)++;
  
!       if (REGNO_FIRST_UID (src_regno) == insn_uid)
! 	REGNO_FIRST_UID (src_regno) = move_uid;
  
!       if (REGNO_LAST_UID (src_regno) == insn_uid)
! 	REGNO_LAST_UID (src_regno) = move_uid;
  
!       if (REGNO_LAST_NOTE_UID (src_regno) == insn_uid)
! 	REGNO_LAST_NOTE_UID (src_regno) = move_uid;
      }
  }
  
  \f
--- 682,705 ----
        if (REGNO_FIRST_UID (dest_regno) == insn_uid)
  	REGNO_FIRST_UID (dest_regno) = move_uid;
  
!       if (REG_P (src))
! 	{
! 	  src_regno = REGNO (src);
! 	  if (! find_reg_note (move_insn, REG_DEAD, src))
! 	    REG_LIVE_LENGTH (src_regno)++;
  
! 	  if (REGNO_FIRST_UID (src_regno) == insn_uid)
! 	    REGNO_FIRST_UID (src_regno) = move_uid;
  
! 	  if (REGNO_LAST_UID (src_regno) == insn_uid)
! 	    REGNO_LAST_UID (src_regno) = move_uid;
  
! 	  if (REGNO_LAST_NOTE_UID (src_regno) == insn_uid)
! 	    REGNO_LAST_NOTE_UID (src_regno) = move_uid;
! 	}
!       return 1;
      }
+   return 0;
  }
  
  \f
*************** regmove_optimize (f, nregs, regmove_dump
*** 1141,1153 ****
  	      dst = recog_operand[match_no];
  	      src = recog_operand[op_no];
  
- 	      if (GET_CODE (src) != REG)
- 		continue;
- 
  	      if (GET_CODE (dst) != REG
  		  || REGNO (dst) < FIRST_PSEUDO_REGISTER
  		  || REG_LIVE_LENGTH (REGNO (dst)) < 0)
  		continue;
  
  	      /* If the operands already match, then there is nothing to do.  */
  	      if (operands_match_p (src, dst)
--- 1144,1165 ----
  	      dst = recog_operand[match_no];
  	      src = recog_operand[op_no];
  
  	      if (GET_CODE (dst) != REG
  		  || REGNO (dst) < FIRST_PSEUDO_REGISTER
  		  || REG_LIVE_LENGTH (REGNO (dst)) < 0)
  		continue;
+ 
+ 	      if (GET_CODE (src) != REG)
+ 		{
+ 		  
+ 		  /* SRC may be a MEM or some other operand type.  We win
+ 		     if we can copy it to the destination and replace SRC
+ 		     with DST.  Note that DST is known to be a REG at this
+ 		     point.  If we are successful quit the loop.  */
+ 		  if (copy_src_to_dest (insn, src, dst, loop_depth))
+ 		    break;
+ 		  continue;
+ 		}
  
  	      /* If the operands already match, then there is nothing to do.  */
  	      if (operands_match_p (src, dst)

Re: GCC 2.7.2.3 good, EGCS 1.0.3 bad for x86 subtract then test

[Jeffrey A Law]

  In message < 19981223141815.C12309@dot.cygnus.com >you write:
  > On Mon, Dec 21, 1998 at 10:52:13AM +0000, Jamie Lokier wrote:
  > > Here's the example program:
  > > 
  > > 	extern void a (void);
  > > 
  > > 	void f (int x, int y)
  > > 	{
  > > 	  if ((x -= y) >= 0)
  > > 	    a ();
  > > 	}
  > 
  > This is solved by a patch Jeff sent me just yesterday.
Yea.  But it seems to generally create worse code -- too aggressive about
copying the source to the destination.  Some tweaking of the heuristic for
when to copy the source to the destination may be needed to make the change
generally useful.

jeff

Re: GCC 2.7.2.3 good, EGCS 1.0.3 bad for x86 subtract then test

[Toshiyasu Morita]

>> This is solved by a patch Jeff sent me just yesterday.
>
> Yea.  But it seems to generally create worse code -- too aggressive about
> copying the source to the destination.  Some tweaking of the heuristic for
> when to copy the source to the destination may be needed to make the change
> generally useful.
> 
> jeff

The patch seems to help some on the SH4; I see it now loading
values directly into fr0 occasionally where it didn't before:

4873:graph3d.ii    ****   min_z = M*(poly.vertices[0].sx-width2) + 
N*(poly.vertices[0].sy-height2) + O;
 1567 0308 57A5                 mov.l   @(20,r10),r7	<- bad!
 1569 030a 7104                 add     #4,r1
 1571 030c 475A                 lds     r7,fpul		<- bad!
 1573 030e F418                 fmov.s  @r1,fr4
 1575 0310 F12D                 float   fpul,fr1	<- bad!
 1577 0312 71FC                 add     #-4,r1
 1579 0314 F218                 fmov.s  @r1,fr2
 1580 0316 52A6                 mov.l   @(24,r10),r2
 1581 0318 F211                 fsub    fr1,fr2
 1582 031a 425A                 lds     r2,fpul
 1583 031c F12D                 float   fpul,fr1
 1585 031e F54C                 fmov    fr4,fr5
 1587 0320 F35C                 fmov    fr5,fr3
 1588 0322 E044                 mov     #68,r0
 1589 0324 F311                 fsub    fr1,fr3
 1590 0326 F0E6                 fmov.s  @(r0,r14),fr0
 1591 0328 F302                 fmul    fr0,fr3
 1592 032a E040                 mov     #64,r0
 1593 032c F0E6                 fmov.s  @(r0,r14),fr0	<- here
 1594 032e F32E                 fmac    fr0,fr2,fr3	<- here
 1595 0330 E048                 mov     #72,r0
 1596 0332 F0E6                 fmov.s  @(r0,r14),fr0
 1597 0334 F300                 fadd    fr0,fr3
...
 1639 0374 F0E6                 fmov.s  @(r0,r14),fr0
 1640 0376 FC2E                 fmac    fr0,fr2,fr12

...but the majority of the cases seem to be missed:

 1731 03f8 FA19                 fmov.s  @r1+,fr10	<- here 
 1733 03fa F522                 fmul    fr2,fr5
 1734 03fc F08C                 fmov    fr8,fr0
4911:graph3d.ii    ****   Q1 = poly.plane.m_cam2tex->m21;
 1736 03fe F619                 fmov.s  @r1+,fr6	<- here 
 1738 0400 F53E                 fmac    fr0,fr3,fr5
 1739 0402 7308                 add     #8,r3
4912:graph3d.ii    ****   Q2 = poly.plane.m_cam2tex->m22;
 1741 0404 F719                 fmov.s  @r1+,fr7
 1743 0406 F138                 fmov.s  @r3,fr1
 1744 0408 F0AC                 fmov    fr10,fr0	<- here 
4913:graph3d.ii    ****   Q3 = poly.plane.m_cam2tex->m23;
4914:graph3d.ii    ****   Q4 = -(Q1*poly.plane.v_cam2tex->x + 
Q2*poly.plane.v_cam2tex->y + Q3*poly.plane.v_cam2tex->z);
 1746 040a F47C                 fmov    fr7,fr4
 1748 040c F51E                 fmac    fr0,fr1,fr5	<- here 
 1750 040e F422                 fmul    fr2,fr4
 1751 0410 F06C                 fmov    fr6,fr0		<- here 
 1752 0412 F43E                 fmac    fr0,fr3,fr4	<- here 	
 1754 0414 FB18                 fmov.s  @r1,fr11	<- here 
4915:graph3d.ii    ****
4916:graph3d.ii    ****   if (Scan::tmap2)
 1756 0416 D26A                 mov.l   L464,r2
 1758 0418 F0BC                 fmov    fr11,fr0	<- here 
 1759 041a F41E                 fmac    fr0,fr1,fr4	<- here
...
4939:graph3d.ii    ****     J1 = P1*Camera::inv_aspect + P4*M;
 1842 04a8 E040                 mov     #64,r0
 1843                   L585:
 1844 04aa F2E6                 fmov.s  @(r0,r14),fr2
 1845 04ac F05C                 fmov    fr5,fr0
 1846 04ae D13F                 mov.l   L459,r1
 1847 04b0 F022                 fmul    fr2,fr0		<- here
 1848 04b2 F118                 fmov.s  @r1,fr1
 1849 04b4 F20C                 fmov    fr0,fr2		<- here
 1850 04b6 F08C                 fmov    fr8,fr0
 1851 04b8 F21E                 fmac    fr0,fr1,fr2	<- here
 1852 04ba E04C                 mov     #76,r0
 1853 04bc FE27                 fmov.s  fr2,@(r0,r14)
4940:graph3d.ii    ****     J2 = P2*Camera::inv_aspect + P4*N;
 1855 04be E044                 mov     #68,r0
 1856 04c0 F2E6                 fmov.s  @(r0,r14),fr2	<- here
 1857 04c2 F05C                 fmov    fr5,fr0
 1858 04c4 F022                 fmul    fr2,fr0		<- here
 1859 04c6 F20C                 fmov    fr0,fr2		<- here
 1860 04c8 F09C                 fmov    fr9,fr0
 1861 04ca F21E                 fmac    fr0,fr1,fr2	<- here
 1862 04cc E050                 mov     #80,r0
 1863 04ce FE27                 fmov.s  fr2,@(r0,r14)
...
4942:graph3d.ii    ****     K1 = Q1*Camera::inv_aspect + Q4*M;
 1871 04da E040                 mov     #64,r0
 1872 04dc F2E6                 fmov.s  @(r0,r14),fr2	<- here
 1873 04de F04C                 fmov    fr4,fr0
 1874 04e0 F022                 fmul    fr2,fr0		<- here
 1875 04e2 F20C                 fmov    fr0,fr2		<- here
 1876 04e4 F06C                 fmov    fr6,fr0
 1877 04e6 F21E                 fmac    fr0,fr1,fr2
 1878 04e8 E058                 mov     #88,r0
 1879 04ea FE27                 fmov.s  fr2,@(r0,r14)
4943:graph3d.ii    ****     K2 = Q2*Camera::inv_aspect + Q4*N;
 1881 04ec E044                 mov     #68,r0
 1882 04ee F2E6                 fmov.s  @(r0,r14),fr2	<- here
 1883 04f0 F04C                 fmov    fr4,fr0
 1884 04f2 F022                 fmul    fr2,fr0		<- here
 1885 04f4 F20C                 fmov    fr0,fr2		<- here
 1886 04f6 F07C                 fmov    fr7,fr0
 1887 04f8 F21E                 fmac    fr0,fr1,fr2	<- here
 1888 04fa E05C                 mov     #92,r0
...

Sometimes these sequences are justified because the value is reused;
e.g.:

	fmov 	@rm,fr9
	fmov	fr9,fr0
	fmac	fr0,frm,frn
...
	(fr0 clobbered)
	fmov	fr9,fr0
	fmac	fr0,frm,frn

however it would be nice if gcc could recognize this and convert this
to:

	fmov	@rm,fr0
	fmov	fr0,fr9
	fmac	fr0,frm,frn
...
	(fr0 clobbered)
	fmov	fr9,fr0
	fmac	fr0,frm,frn

because this sequence gives the scheduler more freedom to move the second 
instruction (fmov fr0,fr9) - it can be moved below the fmac instruction 
if necessary.

The file graph3d.ii is from my stress suite at 
ftp://shell14.ba.best.com/pub.t/~tm2/stress-1.4.tar.gz .

The file matrix.i from the stress suite also elicits the same behavior 
from egcs as well.

Toshi

Re: GCC 2.7.2.3 good, EGCS 1.0.3 bad for x86 subtract then test

[Michael Hayes]

Jeff Law writes:

 > Basically we had something like this before combine:
 > 
 > (set (reg1) (mem (blah))
 > (set (reg2) (mem (oof))
 > (set (reg3) (minus (reg1) (reg2))
 > 
 > Combine turned that into:
 > 
 > (set (reg3) (minus (mem (blah)) (reg2))
 > 
 > Which is allowed by the predicates for the subsi3 insn.
 > 
 > However, it loses because the first input does not match the output
 > operand.  This causes spills & reloads and bad code.

Why not use the extra condition to prevent the combination if the
first input does not match the output operand?

Michael.

Re: GCC 2.7.2.3 good, EGCS 1.0.3 bad for x86 subtract then test

[Jeffrey A Law]

  In message < 13956.18174.396993.213410@ongaonga.elec.canterbury.ac.nz >you writ
e:
  > Why not use the extra condition to prevent the combination if the
  > first input does not match the output operand?
Because that can miss some valueable combination opportunities.  It is also
incorrect for a condition on a named pattern to reject any insn based on
anything other than the target flags.


jeff

Re: GCC 2.7.2.3 good, EGCS 1.0.3 bad for x86 subtract then test

[Michael Hayes]

Jeffrey A Law writes:
 > 
 >   In message < 13956.18174.396993.213410@ongaonga.elec.canterbury.ac.nz >you writ
 > e:
 >   > Why not use the extra condition to prevent the combination if the
 >   > first input does not match the output operand?
 > Because that can miss some valueable combination opportunities.  It is also
 > incorrect for a condition on a named pattern to reject any insn based on
 > anything other than the target flags.

I realise you can't do this for named patterns but this is easily
overcome using named expanders (with exceptions for movMN and addP
patterns required by reload).

What valuable combination opportunities are missed if you write the
extra condition to only accept the valid operand combinations?

[I know this thread popped up a couple of months ago but I feel it was
not satisfactorily resolved...]

Michael.

Re: GCC 2.7.2.3 good, EGCS 1.0.3 bad for x86 subtract then test

[Jeffrey A Law]

  In message < 13956.46052.667366.129757@ongaonga.elec.canterbury.ac.nz >you writ
  > I realise you can't do this for named patterns but this is easily
  > overcome using named expanders (with exceptions for movMN and addP
  > patterns required by reload).
Yup.  You have to be pretty careful, particularly with the move & add
patterns.

  > What valuable combination opportunities are missed if you write the
  > extra condition to only accept the valid operand combinations?
First problem is we'll have a pseudo which is set multiple times and may
die more than once.  This inhibits instruction combination.

Even if those problems are fixed, consider:

(set (reg1) (mem (blah))
(set (reg2) (mem (oof))
(set (reg1) (minus (reg1) (reg2)
(set (mem (blah)) (reg1))


We would like to be able to convert that into:


(set (reg2) (mem (oof))
(set (mem (blah)) (minus (mem (blah)) (reg2)

Which reduces register pressure (and we'd like a post-reload splitter to
break it up into the original sequence if a free reg of the proper class can
be found).

However, to get to the desired code takes 2 combinations.  ie

step1

(set (reg2) (mem (oof))
(set (reg1) (minus (mem (blah)) (reg2)
(set (mem (blah)) (reg1))

step2:

(set (reg2) (mem (oof))
(set (mem (blah)) (minus (mem (blah)) (reg2)

But we can not perform step1 if we are rejecting cases where the source and
destination do not match.

jeff

Re: GCC 2.7.2.3 good, EGCS 1.0.3 bad for x86 subtract then test

[Michael Hayes]

Jeffrey A Law writes:
 > Even if those problems are fixed, consider:
 > 
 > (set (reg1) (mem (blah))
 > (set (reg2) (mem (oof))
 > (set (reg1) (minus (reg1) (reg2)
 > (set (mem (blah)) (reg1))
 > 
 > We would like to be able to convert that into:
 > 
 > (set (reg2) (mem (oof))
 > (set (mem (blah)) (minus (mem (blah)) (reg2)

OK, I understand now.  I've been weaned off these architectures with
read-modify-write instructions.

I suppose ideally the combiner should be able to handle this kind of
transformation rather than having to pretend that we can support more
esoteric operand combinations that we have to fix up afterwards.

Michael.

Re: FWIW: VAX fix backport and gcc built on 4.3BSD first time ever!

[John David Anglin]

> +(define_insn "call_value"
>    [(set (match_operand 0 "" "=g")
>  	(call (match_operand:QI 1 "memory_operand" "m")
> -	      (match_operand:SI 2 "const_int_operand" "n")))
> -   (set (reg:SI 14) (reg:SI 14))]
> +	      (match_operand:SI 2 "const_int_operand" "n")))]
> +  ;; Operand 2 not used on the vax.
>    ""
> -  "*
> -  if (INTVAL (operands[2]) > 255 * 4)
> -    /* Vax `calls' really uses only one byte of #args, so pop explicitly.  */
> -    return \"calls $0,%1\;addl2 %2,sp\";
> -  operands[2] = GEN_INT ((INTVAL (operands[2]) + 3)/ 4);
> -  return \"calls %2,%1\";
> -")
> +  "calls $0,%0")

There is a typo in the above.  I knew I shouldn't have sent this until
it was tested.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: FWIW: VAX fix backport and gcc built on 4.3BSD first time ever!

[John David Anglin]

Here is a revised patch for the mainline vax.md.  The bootstrap with
this patch looks like it is going ok, although it is far from complete.
I will submit the patch formally when I am certain that it is ok.

It is possible that using this new patched version with the 2.95 branch
would work.  It now has the call and call_value patterns which might enable
it to work without the call_pop/call_value_pop patch.  It also has at
least one other fix for a reload problem.  It it does work, this might
be a more acceptable change to incorporate into the 2.95 branch since
it only affects the vax.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

2000-12-21  John David Anglin  <dave@hiauly1.hia.nrc.ca>

	* vax.md (call_pop, call_value_pop): Change to define_expand.
	(call_pop_internal, call, call_value): Define.
	(casesi1 + 1): Make operands contiguous.

--- vax.md.orig	Tue Sep 12 10:58:47 2000
+++ vax.md	Wed Dec 20 13:33:13 2000
@@ -1818,70 +1818,74 @@
   ""
   "decl %0\;jgequ %l1")
 \f
-;; Note that operand 1 is total size of args, in bytes,
-;; and what the call insn wants is the number of words.
-;; It is used in the call instruction as a byte, but in the addl2 as
-;; a word.  Since the only time we actually use it in the call instruction
-;; is when it is a constant, SImode (for addl2) is the proper mode.
-(define_insn "call_pop"
+;; Call instructions.
+
+;; Call procedure returning no value.
+;; Operand 2 is not used on the vax.
+
+(define_expand "call_pop"
   [(call (match_operand:QI 0 "memory_operand" "m")
 	 (match_operand:SI 1 "const_int_operand" "n"))
    (set (reg:SI 14) (plus:SI (reg:SI 14)
 			     (match_operand:SI 3 "immediate_operand" "i")))]
   ""
-  "*
-  if (INTVAL (operands[1]) > 255 * 4)
-    /* Vax `calls' really uses only one byte of #args, so pop explicitly.  */
-    return \"calls $0,%0\;addl2 %1,sp\";
-  operands[1] = GEN_INT ((INTVAL (operands[1]) + 3)/ 4);
-  return \"calls %1,%0\";
-")
+  "
+{
+  emit_insn (gen_call_pop_internal (operands[0], operands[1]));
+  DONE;
+}")
+
+;; Call procedure returning a value in operand 0.
+;; Operand 3 is not used on the vax.
 
-(define_insn "call_value_pop"
+(define_expand "call_value_pop"
   [(set (match_operand 0 "" "=g")
 	(call (match_operand:QI 1 "memory_operand" "m")
 	      (match_operand:SI 2 "const_int_operand" "n")))
    (set (reg:SI 14) (plus:SI (reg:SI 14)
 			     (match_operand:SI 4 "immediate_operand" "i")))]
   ""
-  "*
-  if (INTVAL (operands[2]) > 255 * 4)
-    /* Vax `calls' really uses only one byte of #args, so pop explicitly.  */
-    return \"calls $0,%1\;addl2 %2,sp\";
-  operands[2] = GEN_INT ((INTVAL (operands[2]) + 3)/ 4);
-  return \"calls %2,%1\";
-")
+  "
+{
+  emit_insn (gen_call_pop_internal (operands[1], operands[2]));
+  DONE;
+}")
 
-;; Define another set of these for the case of functions with no
-;; operands.  In that case, combine may simplify the adjustment of sp.
-(define_insn ""
+;; Call procedure with no arguments.
+
+(define_insn "call"
   [(call (match_operand:QI 0 "memory_operand" "m")
-	 (match_operand:SI 1 "const_int_operand" "n"))
-   (set (reg:SI 14) (reg:SI 14))]
+	 (const_int 0))]
   ""
-  "*
-  if (INTVAL (operands[1]) > 255 * 4)
-    /* Vax `calls' really uses only one byte of #args, so pop explicitly.  */
-    return \"calls $0,%0\;addl2 %1,sp\";
-  operands[1] = GEN_INT ((INTVAL (operands[1]) + 3)/ 4);
-  return \"calls %1,%0\";
-")
+  "calls $0,%0")
 
-(define_insn ""
+;; Call procedure returning a value in operand 0 with no arguments.
+
+(define_insn "call_value"
   [(set (match_operand 0 "" "=g")
 	(call (match_operand:QI 1 "memory_operand" "m")
-	      (match_operand:SI 2 "const_int_operand" "n")))
-   (set (reg:SI 14) (reg:SI 14))]
+	      (const_int 0)))]
+  ""
+  "calls $0,%1")
+
+;; Note that operand 1 is total size of args, in bytes,
+;; and what the call insn wants is the number of words.
+;; It is used in the call instruction as a byte, but in the addl2 as
+;; a word.  Since the only time we actually use it in the call instruction
+;; is when it is a constant, SImode (for addl2) is the proper mode.
+(define_insn "call_pop_internal"
+  [(call (match_operand:QI 0 "memory_operand" "m")
+	 (match_operand:SI 1 "const_int_operand" "n"))]
   ""
   "*
-  if (INTVAL (operands[2]) > 255 * 4)
+  if (INTVAL (operands[1]) > 255 * 4)
     /* Vax `calls' really uses only one byte of #args, so pop explicitly.  */
-    return \"calls $0,%1\;addl2 %2,sp\";
-  operands[2] = GEN_INT ((INTVAL (operands[2]) + 3)/ 4);
-  return \"calls %2,%1\";
+    return \"calls $0,%0\;addl2 %1,sp\";
+  operands[1] = GEN_INT ((INTVAL (operands[1]) + 3)/ 4);
+  return \"calls %1,%0\";
 ")
 
-;; Call subroutine returning any type.
+;; Call procedure returning any type.
 
 (define_expand "untyped_call"
   [(parallel [(call (match_operand 0 "" "")
@@ -1986,7 +1990,7 @@
 					  (mult:SI (minus:SI (match_dup 0)
 							     (const_int 0))
 						   (const_int 2)))))
-			       (label_ref:SI (match_operand 3 "" "")))
+			       (label_ref:SI (match_operand 2 "" "")))
 		      (pc)))]
   ""
   "casel %0,$0,%1")

Re: pa reload problem

[John David Anglin]

> (insn 1067 1063 2002 (set (reg/f:SI 403)
>         (mem/u:SI (lo_sum:SI (reg/f:SI 611)
>                 (unspec:SI[ 
>                         (symbol_ref:SI ("target_flags"))
>                     ]  0)) 0)) 69 {*pa.md:2099} (nil)
>     (expr_list:REG_EQUIV (mem/u:SI (lo_sum:SI (reg/f:SI 611)
>                 (unspec:SI[ 
>                         (symbol_ref:SI ("target_flags"))
>                     ]  0)) 0)
>         (expr_list:REG_DEAD (reg/f:SI 611)
>             (nil))))

The REG_EQUIV note gets added in local-alloc.c here:

      /* If this register is known to be equal to a constant, record that
         it is always equivalent to the constant.  */
     if (note && ! rtx_varies_p (XEXP (note, 0)))
       PUT_MODE (note, (enum machine_mode) REG_EQUIV);

The problem appears to be that the "constant" part of the lo_sum (the
symbol_ref) should be the first operand:

    case LO_SUM:
      /* The operand 0 of a LO_SUM is considered constant
         (in fact is it related specifically to operand 1).  */
      return rtx_varies_p (XEXP (x, 1));

This problem appears to prevalent in a number of places in pa.md and pa.c.
It looks like the argument order for lo_sums in hte pa port needs to be
switched.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: pa reload problem

[Jeffrey A Law]

  In message < 200101020037.TAA26820@hiauly1.hia.nrc.ca >you write:
  > > (insn 1067 1063 2002 (set (reg/f:SI 403)
  > >         (mem/u:SI (lo_sum:SI (reg/f:SI 611)
  > >                 (unspec:SI[ 
  > >                         (symbol_ref:SI ("target_flags"))
  > >                     ]  0)) 0)) 69 {*pa.md:2099} (nil)
  > >     (expr_list:REG_EQUIV (mem/u:SI (lo_sum:SI (reg/f:SI 611)
  > >                 (unspec:SI[ 
  > >                         (symbol_ref:SI ("target_flags"))
  > >                     ]  0)) 0)
  > >         (expr_list:REG_DEAD (reg/f:SI 611)
  > >             (nil))))
  > 
  > The REG_EQUIV note gets added in local-alloc.c here:
  > 
  >       /* If this register is known to be equal to a constant, record that
  >          it is always equivalent to the constant.  */
  >      if (note && ! rtx_varies_p (XEXP (note, 0)))
  >        PUT_MODE (note, (enum machine_mode) REG_EQUIV);
  > 
  > The problem appears to be that the "constant" part of the lo_sum (the
  > symbol_ref) should be the first operand:
  > 
  >     case LO_SUM:
  >       /* The operand 0 of a LO_SUM is considered constant
  >          (in fact is it related specifically to operand 1).  */
  >       return rtx_varies_p (XEXP (x, 1));
  > 
  > This problem appears to prevalent in a number of places in pa.md and pa.c.
  > It looks like the argument order for lo_sums in hte pa port needs to be
  > switched.
Huh?  It follows the same convention as every other port that uses
HI and LO_SUM.

op0 is a register, but it is known to be a constant (the high part of
the expression found in op1).

jeff

Re: pa reload problem

[John David Anglin]

>   In message < 200101020037.TAA26820@hiauly1.hia.nrc.ca >you write:
>   > > (insn 1067 1063 2002 (set (reg/f:SI 403)
>   > >         (mem/u:SI (lo_sum:SI (reg/f:SI 611)
>   > >                 (unspec:SI[ 
>   > >                         (symbol_ref:SI ("target_flags"))
>   > >                     ]  0)) 0)) 69 {*pa.md:2099} (nil)
>   > >     (expr_list:REG_EQUIV (mem/u:SI (lo_sum:SI (reg/f:SI 611)
>   > >                 (unspec:SI[ 
>   > >                         (symbol_ref:SI ("target_flags"))
>   > >                     ]  0)) 0)
>   > >         (expr_list:REG_DEAD (reg/f:SI 611)
>   > >             (nil))))
>   > 
>   > The REG_EQUIV note gets added in local-alloc.c here:
>   > 
>   >       /* If this register is known to be equal to a constant, record that
>   >          it is always equivalent to the constant.  */
>   >      if (note && ! rtx_varies_p (XEXP (note, 0)))
>   >        PUT_MODE (note, (enum machine_mode) REG_EQUIV);
>   > 
>   > The problem appears to be that the "constant" part of the lo_sum (the
>   > symbol_ref) should be the first operand:
>   > 
>   >     case LO_SUM:
>   >       /* The operand 0 of a LO_SUM is considered constant
>   >          (in fact is it related specifically to operand 1).  */
>   >       return rtx_varies_p (XEXP (x, 1));
>   > 
>   > This problem appears to prevalent in a number of places in pa.md and pa.c.
>   > It looks like the argument order for lo_sums in hte pa port needs to be
>   > switched.
> Huh?  It follows the same convention as every other port that uses
> HI and LO_SUM.
> 
> op0 is a register, but it is known to be a constant (the high part of
> the expression found in op1).

The problem is that it is "constant" but not invariant.  I was wrong
about the reversal, being confused by the fact that on the pa op1
is either a constant or symbol reference.  Thus, it didn't make much
sense to test op1 of a lo_sum in rtx_varies_p.  I had looked at the
documention but this convention is only documented in the code.

In this particular situation, the op0 register dies and the hard register
that reload asigns to it is reused.  However, reload doesn't check for this
and still goes ahead and substitutes the mem to eliminate the "equivalent"
pseudo.  My impression is that it would be easier to not create the REG_EQUIV
notes in local-alloc after the op0 register dies than fix the problem in
reload.  It appears that reload may substitute a mem for a psuedo whenever it
finds such a note without much testing.

If the REG_EQUIV notes aren't created, it is possible that it may not be
necessary to merge the special pic load insns into the insn which handles
move_operands because the op0 register will always die in the lo_sum insn
and the mem will not be substituted by reload.

I was working on a patch to local-alloc but after updating to the current
cvs today, I find the pa port doesn't build even without -fPIC:

./xgcc -B./ -B/usr/local/hppa1.1-hp-hpux10.20/bin/ -isystem /usr/local/hppa1.1-hp-hpux10.20/include -O2   -DIN_GCC    -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -isystem ./include  -fPIC -g1  -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED  -I. -I. -I../../gcc -I../../gcc/. -I../../gcc/config -I../../gcc/../include -DUSE_COLLECT2 -DL_fixunstfdi -c ../../gcc/libgcc2.c -o libgcc/./_fixunstfdi.o
../../gcc/libgcc2.c: In function `__fixunstfdi':
../../gcc/libgcc2.c:865: Internal compiler error in mark_referenced_resources, at resource.c:229

This occurs in stage 2 when built with -O3.  For some reason, virtual-stack-vars
doesn't get a hard register during reload.  This is a new problem introduced
in the last few days.

I have a couple of pic related patches, but the reload issue and the above
problem need to be resolved before they can be fully tested.  I did have
a complete pic build of gcc when I patched rtx_varies_p to check op0
and op1 of the lo_sum (ie, to ensure that its argument is invariant and
not just constant).  However, I decided this is wrong and that some
additional modifications need to be made to local-alloc to test for
this situation.  I think there needs to be a scan from the init_insn.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: pa reload problem

[Jeffrey A Law]

  In message < 200101040608.BAA05571@hiauly1.hia.nrc.ca >you write:
  > In this particular situation, the op0 register dies and the hard register
  > that reload asigns to it is reused.  However, reload doesn't check for this
  > and still goes ahead and substitutes the mem to eliminate the "equivalent"
  > pseudo. 
And that is the bug.  Blind replacement by reload is a constant source of
problems.

Now as I've mentioned before I've got changes to fix these kinds of problems.
But I haven't had time to finish testing them.

  > My impression is that it would be easier to not create the REG_EQUIV
  > notes in local-alloc after the op0 register dies than fix the problem in
  > reload.  It appears that reload may substitute a mem for a psuedo whenever 
  > it finds such a note without much testing.
That sound like you're barking up the wrong tree.  The REG_EQUIV note is
perfectly valid.  It's reload's fault for blindly substituting it in for
a pseudo that doesn't get a hard register.

  > ./xgcc -B./ -B/usr/local/hppa1.1-hp-hpux10.20/bin/ -isystem /usr/local/hppa
  > 1.1-hp-hpux10.20/include -O2   -DIN_GCC    -W -Wall -Wwrite-strings -Wstric
  > t-prototypes -Wmissing-prototypes -isystem ./include  -fPIC -g1  -DIN_LIBGC
  > C2 -D__GCC_FLOAT_NOT_NEEDED  -I. -I. -I../../gcc -I../../gcc/. -I../../gcc/
  > config -I../../gcc/../include -DUSE_COLLECT2 -DL_fixunstfdi -c ../../gcc/li
  > bgcc2.c -o libgcc/./_fixunstfdi.o
  > ../../gcc/libgcc2.c: In function `__fixunstfdi':
  > ../../gcc/libgcc2.c:865: Internal compiler error in mark_referenced_resourc
  > es, at resource.c:229
  > 
  > This occurs in stage 2 when built with -O3.  For some reason, virtual-stack
  > -vars
  > doesn't get a hard register during reload.  This is a new problem introduce
  > d
  > in the last few days.
Yes.  It's due to some additional checking Alex put into reorg recently.

jeff

Re: pa reload problem

[John David Anglin]

> Now as I've mentioned before I've got changes to fix these kinds of problems.
> But I haven't had time to finish testing them.

If you send them, I will try to help with testing.  Do these also deal
with the problem that reload may substitute a mem valid in one insn into
another in which it is not valid?

>   > My impression is that it would be easier to not create the REG_EQUIV
>   > notes in local-alloc after the op0 register dies than fix the problem in
>   > reload.  It appears that reload may substitute a mem for a psuedo whenever 
>   > it finds such a note without much testing.
> That sound like you're barking up the wrong tree.  The REG_EQUIV note is
> perfectly valid.  It's reload's fault for blindly substituting it in for
> a pseudo that doesn't get a hard register.

The initial one is perfectly valid but probably unnecessary because the
reg used in it dies in the same insn.  It's the latter two which I really
question and cause the problem in reload.  They might not be created if
we lose the initial equivalence or if some checking were added at the
point previously noted in local-alloc.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: pa reload problem

[John David Anglin]

>   > ./xgcc -B./ -B/usr/local/hppa1.1-hp-hpux10.20/bin/ -isystem /usr/local/hppa
>   > 1.1-hp-hpux10.20/include -O2   -DIN_GCC    -W -Wall -Wwrite-strings -Wstric
>   > t-prototypes -Wmissing-prototypes -isystem ./include  -fPIC -g1  -DIN_LIBGC
>   > C2 -D__GCC_FLOAT_NOT_NEEDED  -I. -I. -I../../gcc -I../../gcc/. -I../../gcc/
>   > config -I../../gcc/../include -DUSE_COLLECT2 -DL_fixunstfdi -c ../../gcc/li
>   > bgcc2.c -o libgcc/./_fixunstfdi.o
>   > ../../gcc/libgcc2.c: In function `__fixunstfdi':
>   > ../../gcc/libgcc2.c:865: Internal compiler error in mark_referenced_resourc
>   > es, at resource.c:229
>   > 
>   > This occurs in stage 2 when built with -O3.  For some reason, virtual-stack
>   > -vars
>   > doesn't get a hard register during reload.  This is a new problem introduce
>   > d
>   > in the last few days.
> Yes.  It's due to some additional checking Alex put into reorg recently.

Is Alex working on resolving this?

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: pa reload problem

[Alexandre Oliva]

On Jan  4, 2001, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:

>> > This occurs in stage 2 when built with -O3.  For some reason, virtual-stack
>> > -vars
>> > doesn't get a hard register during reload.  This is a new problem introduce
>> > d
>> > in the last few days.

>> Yes.  It's due to some additional checking Alex put into reorg recently.

> Is Alex working on resolving this?

Not actively.  It's on my to-do list, but I don't know when I'll be
able to get to it.

Please note that the check I've introduced just detects what has been
in error for a long time.  It's not responsible for the failure, that
I'm yet to track down.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist    *Please* write to mailing lists, not to me

Re: pa reload problem

[John David Anglin]

> On Jan  4, 2001, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> 
> >> > This occurs in stage 2 when built with -O3.  For some reason, virtual-stack
> >> > -vars
> >> > doesn't get a hard register during reload.  This is a new problem introduce

As far as I can see, virtual-stack-vars is only left in expr_lists of
of call_insns.  Here is a sample from the greg rtl:

(call_insn/u 51 45 53 (parallel[ 
            (set (reg:SI 28 %r28)
                (call (mem:SI (symbol_ref:SI ("@_U_Qflt")) 0)
                    (const_int 16 [0x10])))
            (clobber (reg:SI 2 %r2))
            (use (const_int 0 [0x0]))
        ] ) 272 {call_value_internal_symref} (insn_list 31 (insn_list 33 (insn_list 35 (insn_list 37 (insn_list 39 (insn_list 41 (insn_list 43 (insn_list 45 (insn_list:REG_DEP_ANTI 6 (insn_list:REG_DEP_ANTI 8 (insn_list:REG_DEP_ANTI 10 (insn_list:REG_DEP_ANTI 12 (insn_list 48 (insn_list 50 (nil)))))))))))))))
    (expr_list:REG_EH_REGION (const_int -1 [0xffffffff])
        (nil))
    (expr_list (use (reg:SI 4 %r4))
        (expr_list (use (reg:SI 19 %r19))
            (expr_list (use (reg:SI 25 %r25))
                (expr_list (use (reg:SI 26 %r26))
                    (expr_list (use (mem/f:TF (plus:SI (reg/f:SI 90 virtual-stack-vars)
                                    (const_int 16 [0x10])) 28))
                        (expr_list (use (mem/f:TF (reg/f:SI 90 virtual-stack-vars) 28))
                            (nil))))))))

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: pa reload problem

[Alexandre Oliva]

On Jan  4, 2001, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:

> As far as I can see, virtual-stack-vars is only left in expr_lists of
> of call_insns.

Yep.  This matches my experience too.  It turns out that I posted a
patch on Dec 30 that would cause them to be properly instantiated, but
it wasn't reviewed yet.  And, if I install another patch that I had
posted about 10 minutes later, that was approved but that I put on
hold, you'd probably start getting other pseudos listed in call_insn
expr_lists, that would give you similar problems because they wouldn't
be handled by reload.

Oh, joy! :-(

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist    *Please* write to mailing lists, not to me

Re: pa reload problem

[John David Anglin]

> On Jan  4, 2001, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> 
> > As far as I can see, virtual-stack-vars is only left in expr_lists of
> > of call_insns.
> 
> Yep.  This matches my experience too.  It turns out that I posted a
> patch on Dec 30 that would cause them to be properly instantiated, but
> it wasn't reviewed yet.  And, if I install another patch that I had
> posted about 10 minutes later, that was approved but that I put on
> hold, you'd probably start getting other pseudos listed in call_insn
> expr_lists, that would give you similar problems because they wouldn't
> be handled by reload.

Should this be backed out until a solution is found?  It prevents the
building the compiler under hpux.

2000-12-29  Alexandre Oliva  <aoliva@redhat.com>

        * calls.c (emit_library_call_value_1): Add to call_fusage the
        stack slot assigned to argument passed by reference.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: RFC: Jump to const_int

[John David Anglin]

> I found the following testcase fails (991213-3.c) with the above abort:
> 
> int jump () { goto * (int (*) ()) 0xbabebec0; }

One further thought.  The test looks bogus to me because the address
clearly can't be in the current function.  Thus, the behavior of such
a jump is totally unpredictable.

Gcc allows as an extension goto's to any void * expression.  Thus, the
above is accepted but it will clearly cause problems when edges are
to be calculated.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: RFC: Jump to const_int

[Fergus Henderson]

On 12-Jan-2001, John David Anglin <dave@hiauly1.hia.nrc.ca> wrote:
> > I found the following testcase fails (991213-3.c) with the above abort:
> > 
> > int jump () { goto * (int (*) ()) 0xbabebec0; }
> 
> One further thought.  The test looks bogus to me because the address
> clearly can't be in the current function.  Thus, the behavior of such
> a jump is totally unpredictable.
>
> Gcc allows as an extension goto's to any void * expression.  Thus, the
> above is accepted but it will clearly cause problems when edges are
> to be calculated.

The *runtime* behaviour of such a jump is unpredictable.
It should be a runtime error, and a compile-time warning might be nice,
but it should not be a compile-time error and nor should the compiler
get an internal compiler error.

-- 
Fergus Henderson <fjh@cs.mu.oz.au>  |  "I have always known that the pursuit
                                    |  of excellence is a lethal habit"
WWW: < http://www.cs.mu.oz.au/~fjh >  |     -- the last words of T. S. Garp.

Re: GCC 3.0 Status Report

[John David Anglin]

Mark,

I would like to draw your attention to these two g++ patches
which I would like considered for both branch and main:

< http://gcc.gnu.org/ml/gcc-patches/2001-04/msg00762.html >
< http://gcc.gnu.org/ml/gcc-patches/2001-04/msg00817.html >

The first one potentially affects all targets.  The second
only affects targets that define PCC_STATIC_STRUCT_RETURN.
However, it is crucial to g++ being usable.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: GCC 3.0 Status Report

[Mark Mitchell]

>>>>> "John" == John David Anglin <dave@hiauly1.hia.nrc.ca> writes:

First, note that Vax Ultrix is not a primary platform the release, so
these patches are not a high priority for me.

    John> http://gcc.gnu.org/ml/gcc-patches/2001-04/msg00762.html

I would prefer a patch that simply did something like:

  minnode = build_int_2 (TREE_INT_CST_LOW (minnode),
                         TREE_INT_CST_HIGH (minnode));
  if (unsignedp)
    TREE_TYPE (minnode) = unsigned_type_node;

I think the hack where you adjust things according to the signedness
at the end is confusing.

    John> http://gcc.gnu.org/ml/gcc-patches/2001-04/msg00817.html

Certainly the bit about setting old_ac is correct.  I'll install that
part of the change.  

I think that probably the other part is correct, but can you explain
it in more detail?  Not what the problem is (I get that), but why your
fix is the correct approach?

I'm not sure that it's possible to get correct C++ semantics with the
PCC calling convention; you might end up with too many copy
constructors, for example.

ChangeLogs shouldn't have justifications in them.  They should go in
the code instead.

Thanks,

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

Re: GCC 3.0 Status Report

[John David Anglin]

> I think that probably the other part is correct, but can you explain
> it in more detail?  Not what the problem is (I get that), but why your
> fix is the correct approach?

I am not entirely certain the approach is correct as my knowledge of
C++ and g++ is limited.  Can you see another way to copy the result
without using build_aggr_init?

My approach was based on debugging the existing code.  The call_expr
is converted by ocp_convert to a tree expression containing another
aggr_init_expr in expand_default_init.  Here is the code there:

      if (flags & DIRECT_BIND)
	/* Do nothing.  We hit this in two cases:  Reference initialization,
	   where we aren't initializing a real variable, so we don't want
	   to run a new constructor; and catching an exception, where we
	   have already built up the constructor call so we could wrap it
	   in an exception region.  */;
      else if (TREE_CODE (init) == CONSTRUCTOR)
	/* A brace-enclosed initializer has whatever type is
	   required.  There's no need to convert it.  */
	;
      else
        init = ocp_convert (type, init, CONV_IMPLICIT|CONV_FORCE_TEMP, flags);

It looked to me like the call was already built, so adding DIRECT_BIND
to the flags was the right thing to do to prevent the conversion.  However,
maybe the code here should be checking for a CALL_EXPR.  There is this
comment for build_aggr_init:

   If INIT resolves to a CALL_EXPR which happens to return
   something of the type we are looking for, then we know
   that we can safely use that call to perform the
   initialization.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: GCC 3.0 Status Report

[John David Anglin]

> >>>>> "John" == John David Anglin <dave@hiauly1.hia.nrc.ca> writes:
> 
> First, note that Vax Ultrix is not a primary platform the release, so
> these patches are not a high priority for me.
> 
>     John> http://gcc.gnu.org/ml/gcc-patches/2001-04/msg00762.html

I understand your priorities but as I noted this problem affects all
ports.  Hey, next time I will provide an analysis on the i386!  What
I am saying is that you have to be careful in ignoring problems on
low priority targets because they may well affect the high priority
ones as well.

> I would prefer a patch that simply did something like:
> 
>   minnode = build_int_2 (TREE_INT_CST_LOW (minnode),
>                          TREE_INT_CST_HIGH (minnode));
>   if (unsignedp)
>     TREE_TYPE (minnode) = unsigned_type_node;
> 
> I think the hack where you adjust things according to the signedness
> at the end is confusing.

The sign adjustment at the end is a bit of a hack but it was a compromise
which allows just one pass through the values as before, and an overall
simplification of the code.

I don't believe your suggestion works directly because minnode has
has the signedness of enumtype after the loop.  The testing for signed
values could be put into the loop as in my patch.

I liked the idea of using the actual type and precision specified in
the original values for the minimum precision estimation, rather than
copying the min and max nodes after the loop and resetting their type
and precision.  Doing the precision calculation in the loop is probably
less complicated than the comparisons needed to determine the min and
max values in the list.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: GCC 3.0 Status Report

[Mark Mitchell]

>>>>> "John" == John David Anglin <dave@hiauly1.hia.nrc.ca> writes:

  >     John> http://gcc.gnu.org/ml/gcc-patches/2001-04/msg00762.html

  I understand your priorities but as I noted this problem affects all
  ports.  

I didn't see that in that message.

But, you are right that it probably could affect most ports.  Some
ports (where pretty much everything is word-sized) are probably OK, by
luck.

Anyhow, I think I have a cleaner patch.  Would you mind mailing me
(privately) the preprocessed source, cc1plus command-line options, and
the target-triplet you're using, so I can make sure that I fixed the
problem?

Thanks!

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

Re: C++ Issue on GCC 3.0 branch

[John David Anglin]

> 2001-04-21  John David Anglin  <dave@hiauly1.hia.nrc.ca>
> 
> 	* builtins.c (expand_builtin_setjmp_setup): Set nonlocal flag in label.

Close but no cigar.  This one actually bootstraps with no regressions under
i686 linux.  However, I think it only addresses the symptom of the problem.
There must be a label uses problem somewhere.  In any event, the testcase
for duplicate symbols will compile with the patch installed.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

2001-04-21  John David Anglin  <dave@hiauly1.hia.nrc.ca>

	* builtins.c (expand_builtin_setjmp): Mark next_lab as used.

--- builtins.c.orig	Wed Feb  7 05:24:22 2001
+++ builtins.c	Sat Apr 21 20:18:59 2001
@@ -617,6 +617,7 @@
   buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
 
   next_lab = gen_label_rtx ();
+  LABEL_PRESERVE_P (next_lab) = 1;
   cont_lab = gen_label_rtx ();
 
   expand_builtin_setjmp_setup (buf_addr, next_lab);

Re: C++ Issue on GCC 3.0 branch

[Bernd Schmidt]

On Sat, 21 Apr 2001, John David Anglin wrote:

> > 2001-04-21  John David Anglin  <dave@hiauly1.hia.nrc.ca>
> >
> > 	* builtins.c (expand_builtin_setjmp_setup): Set nonlocal flag in label.
>
> Close but no cigar.  This one actually bootstraps with no regressions under
> i686 linux.  However, I think it only addresses the symptom of the problem.
> There must be a label uses problem somewhere.  In any event, the testcase
> for duplicate symbols will compile with the patch installed.

You might want to look at the patches I installed on the 2.95 branch after
2.95.3.  This sounds like it's exactly the same problem.


Bernd

Re: C++ Issue on GCC 3.0 branch

[law]

  In message <Pine.LNX.4.33.0104231017340.7552-100000@host140.cambridge.redhat.
com>you write:
  > > There must be a label uses problem somewhere.  In any event, the testcase
  > > for duplicate symbols will compile with the patch installed.
  > 
  > You might want to look at the patches I installed on the 2.95 branch after
  > 2.95.3.  This sounds like it's exactly the same problem.
Are you referring to this patch?

2001-03-28  Bernd Schmidt  <bernds@redhat.com>

        * flow.c (propagate_block): When trying to delete a case vector, cope
        if its label has LABEL_PRESERVE_P set.
        * jump.c (jump_optimize_1): Move call to delete_barrier_successors to
        a point where JUMP_LABELS and LABEL_NUSES are set up properly.
        (delete_barrier_successors): If deleting a table jump, delete the case
        vector as well.
        * varasm.c (force_const_mem): If we have a label, set LABEL_PRESERVE_P
        so it won't get deleted.


Just want to be sure before I install it locally and fire off my tests.

jeff

Re: C++ Issue on GCC 3.0 branch

[Bernd Schmidt]

On Mon, 23 Apr 2001 law@redhat.com wrote:

>   In message <Pine.LNX.4.33.0104231017340.7552-100000@host140.cambridge.redhat.
> com>you write:
>   > > There must be a label uses problem somewhere.  In any event, the testcase
>   > > for duplicate symbols will compile with the patch installed.
>   >
>   > You might want to look at the patches I installed on the 2.95 branch after
>   > 2.95.3.  This sounds like it's exactly the same problem.
> Are you referring to this patch?
>
> 2001-03-28  Bernd Schmidt  <bernds@redhat.com>
>
>         * flow.c (propagate_block): When trying to delete a case vector, cope
>         if its label has LABEL_PRESERVE_P set.
>         * jump.c (jump_optimize_1): Move call to delete_barrier_successors to
>         a point where JUMP_LABELS and LABEL_NUSES are set up properly.
>         (delete_barrier_successors): If deleting a table jump, delete the case
>         vector as well.
>         * varasm.c (force_const_mem): If we have a label, set LABEL_PRESERVE_P
>         so it won't get deleted.

Yes.


Bernd

Re: C++ Issue on GCC 3.0 branch

[Bernd Schmidt]

On Mon, 23 Apr 2001 law@redhat.com wrote:

> 2001-03-28  Bernd Schmidt  <bernds@redhat.com>
>
>         * flow.c (propagate_block): When trying to delete a case vector, cope
>         if its label has LABEL_PRESERVE_P set.
>         * jump.c (jump_optimize_1): Move call to delete_barrier_successors to
>         a point where JUMP_LABELS and LABEL_NUSES are set up properly.
>         (delete_barrier_successors): If deleting a table jump, delete the case
>         vector as well.
>         * varasm.c (force_const_mem): If we have a label, set LABEL_PRESERVE_P
>         so it won't get deleted.

Just remembered; this also needs the followup

2001-03-30  Bernd Schmidt  <bernds@redhat.com>

        * jump.c (delete_barrier_successors): Fix error in last change.


Bernd

Re: C++ Issue on GCC 3.0 branch

[law]

  In message <Pine.LNX.4.33.0104231556040.7552-100000@host140.cambridge.redhat.
com>you write:
  > Just remembered; this also needs the followup
  > 
  > 2001-03-30  Bernd Schmidt  <bernds@redhat.com>
  > 
  >         * jump.c (delete_barrier_successors): Fix error in last change.
OK.  Thanks.  I'll give the set a whirl on my PAs :-)

jeff

Re: C++ Issue on GCC 3.0 branch

[Mark Mitchell]

  2001-04-21  John David Anglin  <dave@hiauly1.hia.nrc.ca>

	  * builtins.c (expand_builtin_setjmp): Mark next_lab as used.

  --- builtins.c.orig	Wed Feb  7 05:24:22 2001
  +++ builtins.c	Sat Apr 21 20:18:59 2001
  @@ -617,6 +617,7 @@
     buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);

     next_lab = gen_label_rtx ();
  +  LABEL_PRESERVE_P (next_lab) = 1;
     cont_lab = gen_label_rtx ();

     expand_builtin_setjmp_setup (buf_addr, next_lab);

Even with this workaround patch I still get a crash using a cross
compiler, so I guess I'll have to wait for Jeff's reworking of Bernd's
patch.

Thanks,

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

Re: C++ Issue on GCC 3.0 branch

[John David Anglin]

>   2001-04-21  John David Anglin  <dave@hiauly1.hia.nrc.ca>
> 
> 	  * builtins.c (expand_builtin_setjmp): Mark next_lab as used.
> 
>   --- builtins.c.orig	Wed Feb  7 05:24:22 2001
>   +++ builtins.c	Sat Apr 21 20:18:59 2001
>   @@ -617,6 +617,7 @@
>      buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
> 
>      next_lab = gen_label_rtx ();
>   +  LABEL_PRESERVE_P (next_lab) = 1;
>      cont_lab = gen_label_rtx ();
> 
>      expand_builtin_setjmp_setup (buf_addr, next_lab);
> 
> Even with this workaround patch I still get a crash using a cross
> compiler, so I guess I'll have to wait for Jeff's reworking of Bernd's
> patch.

Strange.  I just tried it again with the 3.0 source from a few hours
ago with no problems.  The above patch was the only source change.

I just configured with `--with-gnu-as --target=hppa1.1-hp-hpux10.20' and
did a make.  CFLAGS were the default `-g -O2'.  My build gcc was 3.0
20010421 (prerelease).

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: C++ Issue on GCC 3.0 branch

[Mark Mitchell]

After making Dave work hard sending me lots of information, it turns
out that his original patch is exactly the right thing.

I checked in the attached, on both the mainline and the branch;
hopefully it will remove the duplicate symbols on HPUX.

Tested on i686-pc-linux-gnu, and by looking at the .s output for
Dave's testcase.

Thanks,

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

2001-04-25  Mark Mitchell  <mark@codesourcery.com>

	* optimize.c (maybe_clone_body): Copy TREE_PUBLIC before emitting
	the clone.

Index: optimize.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/cp/optimize.c,v
retrieving revision 1.51.2.13
diff -c -p -r1.51.2.13 optimize.c
*** optimize.c	2001/04/25 00:12:47	1.51.2.13
--- optimize.c	2001/04/26 00:28:07
*************** maybe_clone_body (fn)
*** 1051,1056 ****
--- 1051,1057 ----
        DECL_EXTERNAL (clone) = DECL_EXTERNAL (fn);
        DECL_INTERFACE_KNOWN (clone) = DECL_INTERFACE_KNOWN (fn);
        DECL_NOT_REALLY_EXTERN (clone) = DECL_NOT_REALLY_EXTERN (fn);
+       TREE_PUBLIC (clone) = TREE_PUBLIC (fn);
  
        /* Start processing the function.  */
        push_to_top_level ();

Re: C++ Issue on GCC 3.0 branch

[John David Anglin]

Mark,

> After making Dave work hard sending me lots of information, it turns
> out that his original patch is exactly the right thing.
> 
> I checked in the attached, on both the mainline and the branch;
> hopefully it will remove the duplicate symbols on HPUX.

While I am certain that the patch eliminates the duplicate symbols, I
am still concerned that assemble_external is being called with TREE_PUBLIC
and DECL_EXTERNAL set for the type declarations.  This causes .IMPORT
statements to be generated for the symbols under hpux.  While this appears
harmless under HPUX, I am not sure it would be under all circumstances.
It seemed to me that when there is no weak support these declarations
should not be external.  I remember there was some discussion of this
under AIX back in January.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: C++ Issue on GCC 3.0 branch

[Mark Mitchell]

>>>>> "John" == John David Anglin <dave@hiauly1.hia.nrc.ca> writes:

    John> While I am certain that the patch eliminates the duplicate
    John> symbols, I am still concerned that assemble_external is
    John> being called with TREE_PUBLIC and DECL_EXTERNAL set for the
    John> type declarations.  This causes .IMPORT statements to be

Yes, that's why I asked about this.

There's a basic problem here; both the C and C++ front-ends call
assemble_external in a way that is inconsistent with the
assemble_external documentation.

In particular, ASM_OUTPUT_EXTERNAL is documented as used when
something is 

     A C statement (sans semicolon) to output to the stdio stream
     STREAM any text necessary for declaring the name of an external
     symbol named NAME which is referenced in this compilation but not
     defined.  The value of DECL is the tree node for the declaration.

You can't know this until the end of the translation unit.  But, we
compile a function-at-a-time, so if we see:

  extern void f(); 
  void g() { f(); }
  void f() {}

we call this macro for `f'.

It's even more extreme in C++ because we don't make up our minds about
the linkages of some functions until very late in the game.  (See the
tricks played with DECL_NOT_REALLY_EXTERN.)  That's all really pretty
grotesque, but it's not easy to fix, and it's been that way for a long
time, so I'm guessing most systems deal with it OK.

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

Re: C++ Issue on GCC 3.0 branch

[law]

  In message < 20010425173144F.mitchell@codesourcery.com >you write:
  > 
  > After making Dave work hard sending me lots of information, it turns
  > out that his original patch is exactly the right thing.
  > 
  > I checked in the attached, on both the mainline and the branch;
  > hopefully it will remove the duplicate symbols on HPUX.
  > 
  > Tested on i686-pc-linux-gnu, and by looking at the .s output for
  > Dave's testcase.
Noted.  I'm testing hpux PA32 with it now.

jeff

Re: C++ Issue on GCC 3.0 branch

[John David Anglin]

> 0x7adfdbd4 <_ZNSt8ios_base4InitC1Ev+124>:       stw r26,-24(sr0,r3)
> 0x7adfdbd8 <_ZNSt8ios_base4InitC1Ev+128>:
>     bl 0x7adfdac8 <__get_eh_context>,rp
> 0x7adfdbdc <_ZNSt8ios_base4InitC1Ev+132>:       nop
> 0x7adfdbe0 <_ZNSt8ios_base4InitC1Ev+136>:       ldw 9c(sr0,r3),r19
> 0x7adfdbe4 <_ZNSt8ios_base4InitC1Ev+140>:       copy ret0,r20
> 0x7adfdbe8 <_ZNSt8ios_base4InitC1Ev+144>:       stws r20,-10(sr0,sp)
> 0x7adfdbec <_ZNSt8ios_base4InitC1Ev+148>:       fldws -10(sr0,sp),fr22
> 0x7adfdbf0 <_ZNSt8ios_base4InitC1Ev+152>:       fstws fr22,-10(sr0,sp)
> 0x7adfdbf4 <_ZNSt8ios_base4InitC1Ev+156>:       ldws -10(sr0,sp),r1
> 0x7adfdbf8 <_ZNSt8ios_base4InitC1Ev+160>:       stw r1,a4(sr0,r3)
> 0x7adfdbfc <_ZNSt8ios_base4InitC1Ev+164>:       stw r19,9c(sr0,r3)

The problem was not my patch.  There is a real problem with pic C++ code.
The problem is that the "first" save for register r19 comes after the first
function call.  The initial save of r19 was to meet ABI requirements.  The
save at 0x7adfdbfc is the real save that was supposed to be used for
restoration of r19 after function calls.

You can see the problem in the rtl:

;; Function std::ios_base::Init::Init()

(note 1 0 6 ("../../../../libstdc++-v3/src/ios.cc") 137 0)

(insn 6 1 54 (set (reg/v/u/f:SI 94)
        (reg:SI 26 %r26)) -1 (nil)
    (expr_list:REG_EQUIV (mem/u/f:SI (plus:SI (reg/f:SI 89 virtual-incoming-args)
                (const_int -4 [0xfffffffc])) 0)
        (nil)))

(insn 54 6 43 (use:SI (reg:SI 105)) -1 (nil)
    (expr_list:REG_EH_CONTEXT (reg:SI 105)
        (nil)))

(insn 43 54 7 (set (reg:SI 103)
        (reg:SI 19 %r19)) -1 (nil)
    (nil))

(note 7 43 15 NOTE_INSN_FUNCTION_BEG 0)

(note 15 7 17 ("../../../../libstdc++-v3/src/ios.cc") 138 0)

As can be seen, the eh context stuff has been pushed to the beginning of
the function.   We need insn 43 to be at the beginning before the eh
context stuff.  We try to put the save at the start in hppa_init_pic_save:

void hppa_init_pic_save ()
{
  rtx insn, picreg;

  picreg = gen_rtx_REG (word_mode, PIC_OFFSET_TABLE_REGNUM);
  PIC_OFFSET_TABLE_SAVE_RTX = gen_reg_rtx (Pmode);
  insn = gen_rtx_SET (VOIDmode, PIC_OFFSET_TABLE_SAVE_RTX, picreg);

  /* Emit the insn at the beginning of the function after the prologue.  */
  push_topmost_sequence ();
  emit_insn_after (insn, last_parm_insn ? last_parm_insn : get_insns ());
  pop_topmost_sequence ();
}

This is called when the first call insn is encountered.  Any thoughts
on how to fix this?

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: C++ Issue on GCC 3.0 branch

[law]

  In message < 200104232221.SAA21738@hiauly1.hia.nrc.ca >you write:
  > As can be seen, the eh context stuff has been pushed to the beginning of
  > the function.   We need insn 43 to be at the beginning before the eh
  > context stuff.  We try to put the save at the start in hppa_init_pic_save:
Interesting.  I'm not sure if I'll have time to peek at this tonight/tomorrow.
So, if you've got time, you'd want to investigate precisely how the code to
call get_eh_context gets inserted before the code to save the PIC register.

jeff

Re: C++ Issue on GCC 3.0 branch

[John David Anglin]

>   In message < 200104232221.SAA21738@hiauly1.hia.nrc.ca >you write:
>   > As can be seen, the eh context stuff has been pushed to the beginning of
>   > the function.   We need insn 43 to be at the beginning before the eh
>   > context stuff.  We try to put the save at the start in hppa_init_pic_save:
> Interesting.  I'm not sure if I'll have time to peek at this tonight/tomorrow.
> So, if you've got time, you'd want to investigate precisely how the code to
> call get_eh_context gets inserted before the code to save the PIC register.

Yes!  I think that I have the fix.  See below.

The call to get_eh_context gets inserted before the code to save the PIC
register with the same technique that we use to save the PIC register:

rtx
get_eh_context ()
{
  if (current_function_ehc == 0)
    {
       rtx insn;

       current_function_ehc = gen_reg_rtx (Pmode);

       insn = gen_rtx_USE (GET_MODE (current_function_ehc),
			   current_function_ehc);
       insn = emit_insn_before (insn, get_first_nonparm_insn ());

       REG_NOTES (insn)
	 = gen_rtx_EXPR_LIST (REG_EH_CONTEXT, current_function_ehc,
			      REG_NOTES (insn));
    }
  return current_function_ehc;
}

Here are my latest test results for libstdc++-v3:

(chmod + ./mkcheck; \
  srcdir=`cd ../../../libstdc++-v3; pwd`; builddir=`pwd`; \
  test -d testsuite || (mkdir testsuite; chmod u+w testsuite); \
  cd testsuite; ${builddir}/mkcheck 0 ${builddir} ${srcdir})
running mkcheck
/xxx/gnu/gcc-3.0/objdir/hppa1.1-hp-hpux10.20/libstdc++-v3/mkcheck: testing the build directory
making utility ./printnow.exe

Detailed test results in ../20010424-mkcheck.txt
+: pass, -b: build failure, -r: run failure, x: disabled
------------------------------------------------------------------------
static	shared	test
------------------------------------------------------------------------
+	+	17_intro/header_ciso646.cc
+	+	17_intro/header_cstdio.cc
+	+	17_intro/header_cstdlib.cc
+	+	17_intro/header_cstring.cc
+	+	17_intro/header_ctime.cc
+	+	17_intro/header_cwchar.cc
+	+	17_intro/header_cwctype.cc
+	+	17_intro/header_fstream.cc
+	+	17_intro/header_iomanip.cc
+	+	17_intro/header_ios.cc
+	+	17_intro/header_iosfwd.cc
+	+	17_intro/header_iostream.cc
+	+	17_intro/header_istream.cc
+	+	17_intro/header_ostream.cc
+	+	17_intro/header_sstream.cc
+	+	17_intro/header_streambuf.cc
+	+	17_intro/headers.cc
+	+	17_intro/headers_c++.cc
+	+	17_intro/headers_c.cc
+	+	18_support/numeric_limits.cc
+	+	19_diagnostics/stdexceptions.cc
+	+	20_util/auto_ptr.cc
+	-r	21_strings/append.cc
-b	-b	21_strings/capacity.cc
+	+	21_strings/char_traits_requirements.cc
+	+	21_strings/char_traits_typedefs.cc
+	+	21_strings/compare.cc
-r	-r	21_strings/ctor_copy_dtor.cc
+	-r	21_strings/element_access.cc
+	+	21_strings/find.cc
+	-r	21_strings/insert.cc
+	+	21_strings/inserters_extractors.cc
+	+	21_strings/invariants.cc
+	+	21_strings/nonmember.cc
+	+	21_strings/operations.cc
+	+	21_strings/replace.cc
+	+	21_strings/rfind.cc
+	-r	21_strings/substr.cc
+	+	22_locale/codecvt_char_char.cc
+	+	22_locale/codecvt_unicode_char.cc
+	+	22_locale/codecvt_unicode_wchar_t.cc
+	+	22_locale/codecvt_wchar_t_char.cc
+	+	22_locale/ctor_copy_dtor.cc
+	+	22_locale/ctype.cc
-r	/xxx/gnu/gcc-3.0/objdir/hppa1.1-hp-hpux10.20/libstdc++-v3/mkcheck: printf: failed: invalid number
-r	/xxx/gnu/gcc-3.0/objdir/hppa1.1-hp-hpux10.20/libstdc++-v3/mkcheck: printf: failed: invalid number
22_locale/ctype_char_members.cc
+	+	22_locale/ctype_wchar_t_members.cc
+	+	22_locale/facet.cc
+	+	22_locale/global_templates.cc
+	+	22_locale/members.cc
-b	-b	22_locale/numpunct.cc
+	+	22_locale/numpunct_byname.cc
+	+	22_locale/numpunct_char_members.cc
+	+	22_locale/operators.cc
+	+	22_locale/static_members.cc
+	+	23_containers/bitset_ctor.cc
+	+	23_containers/bitset_shift.cc
-b	-b	23_containers/map_operators.cc
+	+	23_containers/multiset.cc
-b	-b	23_containers/set_operators.cc
+	+	23_containers/vector_capacity.cc
+	+	23_containers/vector_ctor.cc
+	-r	23_containers/vector_element_access.cc
+	+	23_containers/vector_modifiers.cc
+	+	24_iterators/istreambuf_iterator.cc
+	+	24_iterators/iterator.cc
+	+	25_algorithms/equal.cc
+	+	25_algorithms/lower_bound.cc
+	+	25_algorithms/min_max.cc
+	/xxx/gnu/gcc-3.0/objdir/hppa1.1-hp-hpux10.20/libstdc++-v3/mkcheck: printf: =: invalid number
+	/xxx/gnu/gcc-3.0/objdir/hppa1.1-hp-hpux10.20/libstdc++-v3/mkcheck: printf: =: invalid number
26_numerics/binary_closure.cc
+	+	26_numerics/buggy_complex.cc
+	+	26_numerics/c99_macros.cc
+	+	26_numerics/c_math.cc
+	+	26_numerics/complex_inserters_extractors.cc
+	+	26_numerics/complex_value.cc
+	+	26_numerics/valarray.cc
-b	-b	27_io/filebuf.cc
+	+	27_io/filebuf_members.cc
+	+	27_io/fpos.cc
+	+	27_io/ifstream_members.cc
+	+	27_io/ios_base_callbacks.cc
-r	/xxx/gnu/gcc-3.0/objdir/hppa1.1-hp-hpux10.20/libstdc++-v3/mkcheck: printf: 24689timemark: invalid number
-r	/xxx/gnu/gcc-3.0/objdir/hppa1.1-hp-hpux10.20/libstdc++-v3/mkcheck: printf: 24689timemark: invalid number
27_io/ios_base_members_static.cc
+	+	27_io/ios_base_storage.cc
+	+	27_io/ios_ctor.cc
+	+	27_io/ios_manip_basefield.cc
+	+	27_io/ios_manip_fmtflags.cc
+	-r	27_io/ios_members.cc
+	+	27_io/istream.cc
+	+	27_io/istream_extractor_arith.cc
-r	/xxx/gnu/gcc-3.0/objdir/hppa1.1-hp-hpux10.20/libstdc++-v3/mkcheck: printf: failed: invalid number
-r	/xxx/gnu/gcc-3.0/objdir/hppa1.1-hp-hpux10.20/libstdc++-v3/mkcheck: printf: failed: invalid number
27_io/istream_extractor_char.cc
+	+	27_io/istream_extractor_other.cc
+	+	27_io/istream_manip.cc
-b	-b	27_io/istream_seeks.cc
+	+	27_io/istream_sentry.cc
diff: ./istream_unformatted-2.txt: No such file or directory
+	diff: ./istream_unformatted-2.txt: No such file or directory
+	27_io/istream_unformatted.cc
+	+	27_io/istringstream_members.cc
+	/xxx/gnu/gcc-3.0/objdir/hppa1.1-hp-hpux10.20/libstdc++-v3/mkcheck: printf: cout: invalid number
+	/xxx/gnu/gcc-3.0/objdir/hppa1.1-hp-hpux10.20/libstdc++-v3/mkcheck: printf: cout: invalid number
27_io/narrow_stream_objects.cc
+	+	27_io/ofstream_members.cc
+	+	27_io/ostream.cc
+	+	27_io/ostream_inserter_arith.cc
+	+	27_io/ostream_inserter_char.cc
+	+	27_io/ostream_inserter_other.cc
+	+	27_io/ostream_manip.cc
+	+	27_io/ostream_seeks.cc
+	+	27_io/ostream_unformatted.cc
+	+	27_io/streambuf.cc
+	+	27_io/stringbuf.cc
+	+	27_io/stringstream.cc
+	+	27_io/wide_stream_objects.cc
+	+	ext/headers.cc
testrun == 9137 seconds

Most of the shared test now run sucessfully!  Yeah!

Here is the configuration:

1) Patch below to add the pic save to the parameter insns.

2) Hack to make type constructors static:
   < http://gcc.gnu.org/ml/gcc/2001-04/msg01011.html >.  Mark was going to
   provide a correct fix for this.

3) NM_FLAG fix:
   < http://gcc.gnu.org/ml/gcc-patches/2001-04/msg01058.html >.

4) Full length subspace names:
   < http://gcc.gnu.org/ml/gcc/2001-04/msg01067.html >.

5) GNU tools (as, nm, etc.) rather than HP.

I will try to look further into the section name problem tomorrow (I've just
driven 12 hours today).  I did notice that HP `nm -p' prints the subspace
names as `t' symbols and they still come out even with "-pg".  I will post
full testresults tomorrow.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

2001-01-04  John David Anglin  <dave@hiauly1.hia.nrc.ca>

	* pa.c (hppa_init_pic_save): Update last_parm_insn after emitting
	pic save insn.

--- pa.c.orig	Tue Apr 17 14:36:50 2001
+++ pa.c	Tue Apr 24 00:03:33 2001
@@ -3359,7 +3359,7 @@
 
   /* Emit the insn at the beginning of the function after the prologue.  */
   push_topmost_sequence ();
-  emit_insn_after (insn, last_parm_insn ? last_parm_insn : get_insns ());
+  last_parm_insn = emit_insn_before (insn, get_first_nonparm_insn ());
   pop_topmost_sequence ();
 }
 

Re: C++ Issue on GCC 3.0 branch

[law]

  In message < 200104250323.XAA05283@hiauly1.hia.nrc.ca >you write:
  > 2001-01-04  John David Anglin  <dave@hiauly1.hia.nrc.ca>
  > 
  > 	* pa.c (hppa_init_pic_save): Update last_parm_insn after emitting
  > 	pic save insn.
This is fine for the mainline sources as well as the branch.

Thanks for tracking this down!

If you want another challenge -- the rethrow1.C test from the g++ testsuite is
getting into an infinite loop.  A 2.95.x based compiler does the right thing.

I've started poking at this, but I don't have a real clear understanding of
the C++ language or its EH semantics.  About the only tidbit I've got that
might be helpful is that we might be missing a call to cp_pop_exception.

jeff

Re: C++ Issue on GCC 3.0 branch

[Mark Mitchell]

>>>>> "law" == law  <law@redhat.com> writes:

    law> I've started poking at this, but I don't have a real clear
    law> understanding of the C++ language or its EH semantics.  About
    law> the only tidbit I've got that might be helpful is that we
    law> might be missing a call to cp_pop_exception.

I'm delighted that we're making progress on HPUX.  That's exciting.

Of course, RTH is getting ready to stand EH on its head.  So, unless
this happens on the mainline, it's probaby not worth looking at; the
whole land of exceptions is going to turn upside down RSN.

Thanks,

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

Re: C++ Issue on GCC 3.0 branch

[law]

  In message < 20010426170133Z.mitchell@codesourcery.com >you write:
  > >>>>> "law" == law  <law@redhat.com> writes:
  > 
  >     law> I've started poking at this, but I don't have a real clear
  >     law> understanding of the C++ language or its EH semantics.  About
  >     law> the only tidbit I've got that might be helpful is that we
  >     law> might be missing a call to cp_pop_exception.
  > 
  > I'm delighted that we're making progress on HPUX.  That's exciting.
  > 
  > Of course, RTH is getting ready to stand EH on its head.  So, unless
  > this happens on the mainline, it's probaby not worth looking at; the
  > whole land of exceptions is going to turn upside down RSN.
I'm really not looking at the mainline at all.  I'll put debugging EH stuff
on hold for now and look at other issues.
jeff

Re: C++ Issue on GCC 3.0 branch

[John David Anglin]

>   In message < 200104250323.XAA05283@hiauly1.hia.nrc.ca >you write:
>   > 2001-01-04  John David Anglin  <dave@hiauly1.hia.nrc.ca>
>   > 
>   > 	* pa.c (hppa_init_pic_save): Update last_parm_insn after emitting
>   > 	pic save insn.
> This is fine for the mainline sources as well as the branch.
> 
> Thanks for tracking this down!

Before I installed this, I checked to make sure there were no gcc regressions
in the testsuite with -fPIC.  I found that in fact there were some.  It looks
like there are problems with the placement of the save instruction when
the first non parameter insn is nil.  I think we need to place the save
after the first insn (the one returned by get_insns ()) in this case.

Some of the fails in the testsuite are due to an abort at integrate.c:430
due to first insn not being a note:

;; Function z

(note 2 0 26 NOTE_INSN_DELETED 0)

(insn 26 2 3 (set (reg:SI 98)
        (reg:SI 19 %r19)) -1 (nil)
    (nil))

(note 3 26 5 NOTE_INSN_FUNCTION_BEG 0)

I am going to go back to the original form and not use
get_first_nonparm_insn ().  I think this will fix the problem.
This suggests that there is also a bug in get_eh_context () for
the same reason.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: C++ Issue on GCC 3.0 branch

[John David Anglin]

> If you want another challenge -- the rethrow1.C test from the g++ testsuite is
> getting into an infinite loop.  A 2.95.x based compiler does the right thing.
> 
> I've started poking at this, but I don't have a real clear understanding of
> the C++ language or its EH semantics.  About the only tidbit I've got that
> might be helpful is that we might be missing a call to cp_pop_exception.

I think we need to define builtin_setjmp_receiver to restore r19.  The
default exception method I believe is exceptions via longjmp, so we need
this.  However, I have no idea whether or not this will fix the problem
with rethrow1.C.

I also noticed a while back that exception_receiver uses a stack offset
of -32 to restore the pic offset table register.  This won't work on
the 64-bit target.  I think we should restore from the
PIC_OFFSET_TABLE_SAVE_RTX.  However, we need to wait for it to be
initialized.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: C++ Issue on GCC 3.0 branch

[law]

  In message < 200104272214.SAA06753@hiauly1.hia.nrc.ca >you write:
  > I think we need to define builtin_setjmp_receiver to restore r19.  The
  > default exception method I believe is exceptions via longjmp, so we need
  > this.  However, I have no idea whether or not this will fix the problem
  > with rethrow1.C.
Yes, we probably need to restore %r19, but I'm 99.9 certain that's not the
problem with the rethrow test since they fail with static libraries.


  > I also noticed a while back that exception_receiver uses a stack offset
  > of -32 to restore the pic offset table register.  This won't work on
  > the 64-bit target.  I think we should restore from the
  > PIC_OFFSET_TABLE_SAVE_RTX.  However, we need to wait for it to be
  > initialized.
Right.
jeff

Re: C++ Issue on GCC 3.0 branch

[John David Anglin]

>   In message < 200104250323.XAA05283@hiauly1.hia.nrc.ca >you write:
>   > 2001-01-04  John David Anglin  <dave@hiauly1.hia.nrc.ca>
>   > 
>   > 	* pa.c (hppa_init_pic_save): Update last_parm_insn after emitting
>   > 	pic save insn.
> This is fine for the mainline sources as well as the branch.

I have installed it on the branch.  The code on the main is different.
Thus, I don't know if the same problem exists there or not.  The code
on the main looks strange to me.  One change that looks certainly
correct is to set RTX_UNCHANGING_P in PIC_OFFSET_TABLE_SAVE_RTX.

> Thanks for tracking this down!
> 
> If you want another challenge -- the rethrow1.C test from the g++ testsuite is
> getting into an infinite loop.  A 2.95.x based compiler does the right thing.
> 
> I've started poking at this, but I don't have a real clear understanding of
> the C++ language or its EH semantics.  About the only tidbit I've got that
> might be helpful is that we might be missing a call to cp_pop_exception.

I have been looking at some of the g++ failures.  I have some revisions
to the setjmp/longjmp stuff in pa.md.  However, I noticed last night
that some code generated by builtin_setjmp was missing.  It appears that
more than just labels were disappearing.  Essentially, builtin_setjmp
was dropping into the receiver code on the intial setup.

I have updated my test source so that it now includes your disappearing
label patch.  Hopefully, this will fix some of the problems.  I visually
looked at the assembler code in __sjthrow and it now looks ok.  Tests
are running..

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc 2.95.2

[Joe Buck]

> I am planning to install gcc 2.95.2 on an IBM AIX server.  I am
> dowloading the gcc from the sunfreeware site.  Does gcc 2.95.2 works on
> IBM AIX server.

sunfreeware provides precompiled binaries for Solaris, not for IBM AIX,
so that isn't going to work.  But gcc does support AIX.

Please ask the gcc-help@gcc.gnu.org list for assistance; gcc@gcc.gnu.org
is the compiler developers' list.

Re: STL warnings recently appeared in the 3.0 branch

[John David Anglin]

> On Jun 14, 2001, Sylvain Pion <Sylvain.Pion@sophia.inria.fr> wrote:

> > .../include/g++-v3/bits/stl_alloc.h:494:
> > warning: aggregate has a partly bracketed initializer

> > I don't get them on GNU-Linux, but they appear on Solaris.

> IIRC, this is a bug in Solaris' headers.  The initializer for mutexes
> defined in some header file triggers this warning.

If you are using solaris threads (gthr-solaris.h), the system headers
(thread.h) are supposed to define DEFAULTMUTEX.  If they don't, the
initializer is broken and the STL mutex locking won't work properly.
The integration of GTHREADS into v3 is new which is why your seeing
the warning.  My previous comments probably don't apply to solaris.

The file gthr-solaris.h may need to check to see if DEFAULTMUTEX is
defined.  If it isn't then, some fallback is needed.  This could be
defining DEFAULTMUTEX, or using __GTHREAD_ONCE_INIT_FUNCTION instead
of __GTHREAD_ONCE_INIT.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Possible corruption of gcc-3.0-20010614.tar.bz2

[John David Anglin]

>     [11: huff+mtf
> bzip2: Caught a SIGSEGV or SIGBUS whilst decompressing,
> 	which probably indicates that the compressed data
> 	is corrupted.
> 	Input file = Z/gcc-3.0-20010614.tar.bz2, output file = (none)

The problem has been confirmed with a second download from a mirror
source.  I also tried decompressing unde i686 linux with same result.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: PATCH: Fix invalid loader fixups from shared libobjc with

[John David Anglin]

> The problem appears wider than just hpux.  See for example,
> < http://gcc.gnu.org/ml/gcc-testresults/2001-06/msg00329.html >.
> This report is for i686-pc-linux-gnu.  I can't say exactly what

I have just run a bootstrap and check to verify this problem.  There
is a problem with the testsuite and the failures are not directly
related to the hpux problem:

/home/dave/gnu/gcc-3.0-20010614/objdir/gcc/testsuite/IMP.x: error in loading shared libraries: libgcc_s.so.1: cannot open shared object file: No such file or directory

I believe that this problem arises on my linux system because
LD_LIBRARY_PATH doesn't affect the patch for dependent libraries (libobjc).
I had some discussion with Alex about trying to fix this with libtool
but the objc testsuite doesn't use libtool.  It just uses xgcc to
build and link testsuite apps.

A second problem is the installation location of libobjc.  It got
installed in ${prefix}/lib/gcc-lib/i688-pc-linux-gnu/3.0.  The other
shared libraries all went in the more normal location ${prefix}/lib.
${prefix}/lib/gcc-lib/i688-pc-linux-gnu/3.0 is not one of the paths
that my system normally uses in its shared library search.  Do you
advise people to make this change or is libobjc being installed
in the wrong place now that it is possible to build a shared version
of it?

Regarding the hpux problem at hand, I see some warnings like this
in the objc.log:

spawn /home/dave/gnu/gcc-3.0-20010614/objdir/gcc/xgcc -B/home/dave/gnu/gcc-3.0-20010614/objdir/gcc/ /home/dave/gnu/gcc-3.0-20010614/gcc/testsuite/objc/execute/string4.m -w -O -I/home/dave/gnu/gcc-3.0-20010614/gcc/testsuite/../../libobjc -L/home/dave/gnu/gcc-3.0-20010614/objdir/i686-pc-linux-gnu/libobjc/.libs -lobjc -lm -o /home/dave/gnu/gcc-3.0-20010614/objdir/gcc/testsuite/string4.x 
/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.0/../../../../i686-pc-linux-gnu/bin/ld: warning: type and size of dynamic symbol `__objc_class_name_NXConstantString' are not defined

And in libobjc.a:

0000000000000004 ? __objc_class_name_Object

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Simple returns are broken in gcc 3.X

[John David Anglin]

> In looking into why g++ didn't work for vax-dec-ultrix4.3, I have found
> that simple returns are broken.  Compiling this small test program
> 
> static char *
> srealloc (char *p, char *q, int i)
> {
>   if (i == 0)
>     return p;
>   else
>     return q;
> }
> 
> yields
> 
> #NO_APP
> 	.text
> 	.align 1
> __Z8sreallocPcS_i:
> 	.word 0x0
> 	subl2 $12,sp
> 	tstl 12(ap)
> 	jneq L2
> 	ret
> L2:
> 	ret

This patch fixes the above problem by always forcing a "goto" return.
The patch only affects the vax since it is the only remaining port that
doesn't define an epilogue and allows the expansion of simple returns
prior to reload.  This patch changes the vax port to use the same
code patch for return generation as all others.  As a side benefit, the
change also fixes function instrumentation on the vax.

The above behavior is a regression versus previous gcc versions since
g++ was functional on the vax in version 2.8.1.

Full bootstrap has been done with vax-dec-ultrix4.3 with 3.0 branch.
Bootstrap and regression checked with 3.0 branch on hppa1.1-hp-hpux10.20
and i686-pc-linux-gnu.  Bootstrap and regression checked with 3.1
mainline on i686-pc-linux-gnu.

OK for main?  I would like it on the branch as well but there are a
couple of other patches needed before C++ will be fully functional
on the vax.  Thus, it can wait until after 3.0.1 is released.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

2001-08-09  John David Anglin  <dave@hiauly1.hia.nrc.ca>

	* stmt.c (expand_null_return_1): Remove code to generate simple returns 
	and "use_goto" argument.
	(expand_null_return, expand_value_return): Update all callers.
	* function.c (expand_function_end): Remove code to generate simple
	return.
	* config/vax/vax.md (epilogue): New expander for function return.
	* doc/md.texi (epilogue): Remove "if defined".

--- stmt.c.orig	Tue Jul 31 10:22:56 2001
+++ stmt.c	Wed Aug  1 15:52:05 2001
@@ -403,7 +403,7 @@
 static void expand_nl_goto_receivers	PARAMS ((struct nesting *));
 static void fixup_gotos			PARAMS ((struct nesting *, rtx, tree,
 					       rtx, int));
-static void expand_null_return_1	PARAMS ((rtx, int));
+static void expand_null_return_1	PARAMS ((rtx));
 static void expand_value_return		PARAMS ((rtx));
 static int tail_recursion_args		PARAMS ((tree, tree));
 static void expand_cleanups		PARAMS ((tree, tree, int, int));
@@ -2863,7 +2863,6 @@
 void
 expand_null_return ()
 {
-  struct nesting *block = block_stack;
   rtx last_insn = get_last_insn ();
 
   /* If this function was declared to return a value, but we
@@ -2871,13 +2870,7 @@
      propogated live to the rest of the function.  */
   clobber_return_register ();
 
-  /* Does any pending block have cleanups?  */
-  while (block && block->data.block.cleanups == 0)
-    block = block->next;
-
-  /* If yes, use a goto to return, since that runs cleanups.  */
-
-  expand_null_return_1 (last_insn, block != 0);
+  expand_null_return_1 (last_insn);
 }
 
 /* Generate RTL to return from the current function, with value VAL.  */
@@ -2886,7 +2879,6 @@
 expand_value_return (val)
      rtx val;
 {
-  struct nesting *block = block_stack;
   rtx last_insn = get_last_insn ();
   rtx return_reg = DECL_RTL (DECL_RESULT (current_function_decl));
 
@@ -2913,27 +2905,15 @@
 	emit_move_insn (return_reg, val);
     }
 
-  /* Does any pending block have cleanups?  */
-
-  while (block && block->data.block.cleanups == 0)
-    block = block->next;
-
-  /* If yes, use a goto to return, since that runs cleanups.
-     Use LAST_INSN to put cleanups *before* the move insn emitted above.  */
-
-  expand_null_return_1 (last_insn, block != 0);
+  expand_null_return_1 (last_insn);
 }
 
 /* Output a return with no value.  If LAST_INSN is nonzero,
-   pretend that the return takes place after LAST_INSN.
-   If USE_GOTO is nonzero then don't use a return instruction;
-   go to the return label instead.  This causes any cleanups
-   of pending blocks to be executed normally.  */
+   pretend that the return takes place after LAST_INSN.  */
 
 static void
-expand_null_return_1 (last_insn, use_goto)
+expand_null_return_1 (last_insn)
      rtx last_insn;
-     int use_goto;
 {
   rtx end_label = cleanup_label ? cleanup_label : return_label;
 
@@ -2941,27 +2921,8 @@
   do_pending_stack_adjust ();
   last_expr_type = 0;
 
-  /* PCC-struct return always uses an epilogue.  */
-  if (current_function_returns_pcc_struct || use_goto)
-    {
-      if (end_label == 0)
-	end_label = return_label = gen_label_rtx ();
-      expand_goto_internal (NULL_TREE, end_label, last_insn);
-      return;
-    }
-
-  /* Otherwise output a simple return-insn if one is available,
-     unless it won't do the job.  */
-#ifdef HAVE_return
-  if (HAVE_return && use_goto == 0 && cleanup_label == 0)
-    {
-      emit_jump_insn (gen_return ());
-      emit_barrier ();
-      return;
-    }
-#endif
-
-  /* Otherwise jump to the epilogue.  */
+  if (end_label == 0)
+     end_label = return_label = gen_label_rtx ();
   expand_goto_internal (NULL_TREE, end_label, last_insn);
 }
 \f
--- function.c.orig	Sat Jun  9 15:22:26 2001
+++ function.c	Wed Aug  1 12:40:23 2001
@@ -6949,18 +6949,6 @@
      instead of using the general framework.  */
   use_return_register ();
 
-  /* Output a return insn if we are using one.
-     Otherwise, let the rtl chain end here, to drop through
-     into the epilogue.  */
-
-#ifdef HAVE_return
-  if (HAVE_return)
-    {
-      emit_jump_insn (gen_return ());
-      emit_barrier ();
-    }
-#endif
-
   /* Fix up any gotos that jumped out to the outermost
      binding level of the function.
      Must follow emitting RETURN_LABEL.  */
--- config/vax/vax.md.orig	Sun Jan 14 04:08:51 2001
+++ config/vax/vax.md	Tue Jul 31 22:08:45 2001
@@ -1926,6 +1926,15 @@
   ""
   "ret")
 
+(define_expand "epilogue"
+  [(return)]
+  ""
+  "
+{
+  emit_jump_insn (gen_return ());
+  DONE;
+}")
+
 (define_insn "nop"
   [(const_int 0)]
   ""
--- doc/md.texi.orig	Thu Jun 14 18:54:21 2001
+++ doc/md.texi	Thu Aug  9 12:24:04 2001
@@ -2859,7 +2859,7 @@
 
 @cindex @code{epilogue} instruction pattern
 @item @samp{epilogue}
-This pattern, if defined, emits RTL for exit from a function.  The function
+This pattern emits RTL for exit from a function.  The function
 exit is responsible for deallocating the stack frame, restoring callee saved
 registers and emitting the return instruction.
 

Re: Simple returns are broken in gcc 3.X

[Richard Henderson]

On Thu, Aug 09, 2001 at 06:12:04PM -0400, John David Anglin wrote:
> 	* stmt.c (expand_null_return_1): Remove code to generate simple returns 
> 	and "use_goto" argument.
> 	(expand_null_return, expand_value_return): Update all callers.
> 	* function.c (expand_function_end): Remove code to generate simple
> 	return.
> 	* config/vax/vax.md (epilogue): New expander for function return.
> 	* doc/md.texi (epilogue): Remove "if defined".

Ok.


r~

Re: Question regarding ICE in instantiate_virtual_regs_1, at function.c:3880

[John David Anglin]

> I am seeing a number of ICEs in the testsuite in instantiate_virtual_regs_1,
> at function.c:3880, on vax-dec-ultrix4.3 with the main.  The first one that
> I looked at occurs on this insn in gcc.c-torture/compile/991213-1.c:
> 
> (insn 22 21 23 (set (mem/f:DF (plus:SI (reg/f:SI 17 virtual-stack-vars)
>                 (const_int -20 [0xffffffec])) [0 arg+8 S8 A64])
> 	(subreg:DF (mem:DC (plus:SI (mult:SI (reg:SI 21)
> 			(const_int 16 [0x10]))
> 		    (mem/f:SI (reg/f:SI 16 virtual-incoming-args) [0 t+0 S4 A32])) [0 S16 A32]) 8)) -1 (nil)
>    (nil))
> 
> It appears that instantiate_virtual_regs_1 ICEs because general_operand
> (see recog.c:966) doesn't allow a SUBREG with a nonzero SUBREG_BYTE and
> this causes the first instantiation to fail.  Should this insn have been
> created in the first place if there is this limitation on SUBREG MEMs?

I see that the change to general_operand to prohibit nonzero subreg bytes
was made last last May to fix a "not so trivial powerpc regression"
<http://gcc.gnu.org/ml/gcc-patches/2001-05/msg01309.html>.  In this
message, there is mention of being less aggressive and verifying if
offsetted memory will match.  On the otherhand, Richard suggested that
it would be better not to create these subregs in the first place.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Question regarding ICE in instantiate_virtual_regs_1, at function.c:3880

[John David Anglin]

> > I am seeing a number of ICEs in the testsuite in instantiate_virtual_regs_1,
> > at function.c:3880, on vax-dec-ultrix4.3 with the main.  The first one that
> > I looked at occurs on this insn in gcc.c-torture/compile/991213-1.c:
> > 
> > (insn 22 21 23 (set (mem/f:DF (plus:SI (reg/f:SI 17 virtual-stack-vars)
> >                 (const_int -20 [0xffffffec])) [0 arg+8 S8 A64])
> > 	(subreg:DF (mem:DC (plus:SI (mult:SI (reg:SI 21)
> > 			(const_int 16 [0x10]))
> > 		    (mem/f:SI (reg/f:SI 16 virtual-incoming-args) [0 t+0 S4 A32])) [0 S16 A32]) 8)) -1 (nil)
> >    (nil))
> > 

I have come to the conclusion that there is a problem with
GO_IF_LEGITIMATE_ADDRESS on the vax (ie, it shouldn't accept a
DCmode MEM with the above indexing) since the maximum number
of bytes that can be moved in a single insn is 8.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Question regarding ICE in instantiate_virtual_regs_1, at function.c:3880

[Jan Hubicka]

> > > I am seeing a number of ICEs in the testsuite in instantiate_virtual_regs_1,
> > > at function.c:3880, on vax-dec-ultrix4.3 with the main.  The first one that
> > > I looked at occurs on this insn in gcc.c-torture/compile/991213-1.c:
> > > 
> > > (insn 22 21 23 (set (mem/f:DF (plus:SI (reg/f:SI 17 virtual-stack-vars)
> > >                 (const_int -20 [0xffffffec])) [0 arg+8 S8 A64])
> > > 	(subreg:DF (mem:DC (plus:SI (mult:SI (reg:SI 21)
> > > 			(const_int 16 [0x10]))
> > > 		    (mem/f:SI (reg/f:SI 16 virtual-incoming-args) [0 t+0 S4 A32])) [0 S16 A32]) 8)) -1 (nil)
> > >    (nil))
> > > 
> 
> I have come to the conclusion that there is a problem with
> GO_IF_LEGITIMATE_ADDRESS on the vax (ie, it shouldn't accept a
> DCmode MEM with the above indexing) since the maximum number
> of bytes that can be moved in a single insn is 8.
Yes, this is the complex type hackery - basically it does the DC modes behind
scene w/o validation from backend splitting it later.
What you need is to figure out from where the subreg is comming and replace
gen_SUBREG by simplify_gen_subreg. That should be enought I guess.

In case simplify_gen_subreg for some purpose refuse to simplify memory in question,
let me know.

Honza
> 
> Dave
> -- 
> J. David Anglin                                  dave.anglin@nrc.ca
> National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Question regarding ICE in instantiate_virtual_regs_1, at function.c:3880

[John David Anglin]

> > I have come to the conclusion that there is a problem with
> > GO_IF_LEGITIMATE_ADDRESS on the vax (ie, it shouldn't accept a
> > DCmode MEM with the above indexing) since the maximum number
> > of bytes that can be moved in a single insn is 8.
> Yes, this is the complex type hackery - basically it does the DC modes behind
> scene w/o validation from backend splitting it later.
> What you need is to figure out from where the subreg is comming and replace
> gen_SUBREG by simplify_gen_subreg. That should be enought I guess.
> 
> In case simplify_gen_subreg for some purpose refuse to simplify memory in question,
> let me know.

The subreg is coming from simplify_gen_subreg:

  new = simplify_subreg (outermode, op, innermode, byte);
  if (new)
    return new;

  if (GET_CODE (op) == SUBREG || GET_MODE (op) == VOIDmode)
    return NULL_RTX;

  return gen_rtx_SUBREG (outermode, op, byte);
}

The call to simplify_subreg us not successful because mode_dependent_address_p

returns true for:

(plus:SI (mult:SI (reg:SI 21)
        (const_int 16 [0x10]))
    (mem/f:SI (reg/f:SI 16 virtual-incoming-args) [0 t+0 S4 A32]))

At the moment, GO_IF_MODE_DEPENDENT_ADDRESS only accepts a plus with
a register and a constant address.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Question regarding ICE in instantiate_virtual_regs_1, at function.c:3880

[Jan Hubicka]

> > > I have come to the conclusion that there is a problem with
> > > GO_IF_LEGITIMATE_ADDRESS on the vax (ie, it shouldn't accept a
> > > DCmode MEM with the above indexing) since the maximum number
> > > of bytes that can be moved in a single insn is 8.
> > Yes, this is the complex type hackery - basically it does the DC modes behind
> > scene w/o validation from backend splitting it later.
> > What you need is to figure out from where the subreg is comming and replace
> > gen_SUBREG by simplify_gen_subreg. That should be enought I guess.
> > 
> > In case simplify_gen_subreg for some purpose refuse to simplify memory in question,
> > let me know.
> 
> The subreg is coming from simplify_gen_subreg:
> 
>   new = simplify_subreg (outermode, op, innermode, byte);
>   if (new)
>     return new;
> 
>   if (GET_CODE (op) == SUBREG || GET_MODE (op) == VOIDmode)
>     return NULL_RTX;
> 
>   return gen_rtx_SUBREG (outermode, op, byte);
> }
> 
> The call to simplify_subreg us not successful because mode_dependent_address_p
> 
> returns true for:
> 
> (plus:SI (mult:SI (reg:SI 21)
>         (const_int 16 [0x10]))
>     (mem/f:SI (reg/f:SI 16 virtual-incoming-args) [0 t+0 S4 A32]))
> 
> At the moment, GO_IF_MODE_DEPENDENT_ADDRESS only accepts a plus with
> a register and a constant address.
I see. This is somewhat unfortunate.
What I was thinking about is to add simplify_subreg_force wrapper that will
do converison even if it looks wrong (resulting address is invalid or resulting
register having not valid mode).
This is usefull for few other places too (alter_subreg, split_di), perhaps it
can be used here too. Sound sane?

Honza
> 
> Dave
> -- 
> J. David Anglin                                  dave.anglin@nrc.ca
> National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Question regarding ICE in instantiate_virtual_regs_1, at function.c:3880

[John David Anglin]

> > > > I have come to the conclusion that there is a problem with
> > > > GO_IF_LEGITIMATE_ADDRESS on the vax (ie, it shouldn't accept a
> > > > DCmode MEM with the above indexing) since the maximum number
> > > > of bytes that can be moved in a single insn is 8.

Changing GO_IF_LEGITIMATE_ADDRESS to reject DCmode (or larger) index
addresses in the form plus ((mult ((reg) (const_int))) (mem)) appears
to resolve the problem.  Logically, this seems the correct approach as
the capability to index DCmode doesn't exist on all VAXen, and no DCmode
patterns are presently in the machine definition.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: condition codes, haifa-sched and virtual-stack-vars

[Ulrich Weigand]

Following up on myself:

> The reload_inhi pattern tries to allocate the carry register as the
> secondary reload scratch register.  Now, in the interesting case 
> where the carry register is in fact live at the location where the
> insn is inserted, this would mean that reload would need to spill
> the carry register and later on restore its old value, right?
> (Because there is only a single register in this class ...)
> 
> However, I'm not sure how the carry register can be spilled,
> given that there is no mov* insn that touches it, unless I'm
> missing something ...

Hmm, what I was missing was that apparently the carry register
can *never* be live during reload, as all insns that actually
use it (except for just a clobber) are *only* ever emitted from 
splitters after reload.

So what I called the 'interesting case' above never happens ...


Bye,
Ulrich

-- 
  Dr. Ulrich Weigand
  weigand@informatik.uni-erlangen.de

Re: Help! DW function pointer encoding for PA

[John David Anglin]

> I'll have to look more carefully at the ia64.  I think I see what
> ia64_expand_call is doing to handle the function descriptor vs FDE
> issue:

It appears that the PA has a serious problem in its handling of function
descriptors.  This small test program demonstrates the problem:

int f (int (*func)(void)) { func(); }
int main (void);
int (*i)(void) = &main;
int main() { f (i); f (main); }

This is the assembly output showing how the plabels for the two calls
in main are treated:

	addil LR'i-$global$,%r27
	ldw RR'i-$global$(%r1),%r26
	.CALL ARGW0=GR
	bl f,%r2
	nop
	ldil LR'L$C0000,%r19
	ldw RR'L$C0000(%r19),%r26
	.CALL ARGW0=GR
	bl f,%r2
	nop

As can be seen, the call using  plabel "i" is handled correctly.  However,
for the plabel L$C0000 used in the second call, we are in fact loading the
address of the function from the descriptor rather than the address of the
descriptor.  Thus, indirect calls where the pic register changes value won't
work.  I don't know how this went unnoticed for so long.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Help! DW function pointer encoding for PA

[David Edelsohn]

	As a point of comparison, the AIX and powerpc64-linux
configurations (which also uses function descriptors) do the right thing
for your testcase.

David

Re: middle-end/6180: Infinite loop in cc1 during dbr pass

[John David Anglin]

> in an indeterminate position.  reposition_prologue_and_epilogue_notes
> moves the epilogue begin note before the sequence.  However, in
> fixing the insn chain, it apparently doesn't check for a sequence
> and the chain is left in a corrupt state.  In particular, it doesn't
> touch the numbering inside the sequence.

reposition_prologue_and_epilogue_notes uses reorder_insns.  The comments
for reorder_insns_nobb indicate that it doesn't know about sequences
and it looks like the same is true for reorder_insns.  Thus, it can't
be used at this point.

Do we actually need to call reposition_prologue_and_epilogue_notes
at this point?

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: middle-end/6180: Infinite loop in cc1 during dbr pass

[Richard Henderson]

On Fri, Apr 05, 2002 at 02:54:08PM -0500, John David Anglin wrote:
> Do we actually need to call reposition_prologue_and_epilogue_notes
> at this point?

Dunno.  Probably not.


r~

Re: middle-end/6180: Infinite loop in cc1 during dbr pass

[John David Anglin]

> On Fri, Apr 05, 2002 at 02:54:08PM -0500, John David Anglin wrote:
> > Do we actually need to call reposition_prologue_and_epilogue_notes
> > at this point?

My conclusion is that we can't reposition prologue and epilogue notes
at this point in dbr_schedule because the above function can't handle
sequences.  Further, the exact end and start of the prologue and
epilogue, respectively, is indeterminant.  Thus, I propose that the
notes not be repositioned.

I have confirmed that the enclosed patch fixes the compilation problem
of nm.c under hppa-linux.  I have bootstrapped and checked that there
are no regressions with this patch under hppa-linux and
hppa2.0w-hp-hpux11.11.

The compilation failure of nm.c is a regression from 3.0.x.  OK for
trunk and 3.1 branch?

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

2002-04-06  John David Anglin  <dave@hiauly1.hia.nrc.ca>

	* reorg.c (dbr_schedule): Don't reposition prologue and epilogue notes.

Index: reorg.c
===================================================================
RCS file: /cvsroot/gcc/gcc/gcc/reorg.c,v
retrieving revision 1.70
diff -u -3 -p -r1.70 reorg.c
--- reorg.c	31 Mar 2002 18:45:21 -0000	1.70
+++ reorg.c	6 Apr 2002 02:18:27 -0000
@@ -3686,10 +3686,6 @@ dbr_schedule (first, file)
   /* It is not clear why the line below is needed, but it does seem to be.  */
   unfilled_firstobj = (rtx *) obstack_alloc (&unfilled_slots_obstack, 0);
 
-  /* Reposition the prologue and epilogue notes in case we moved the
-     prologue/epilogue insns.  */
-  reposition_prologue_and_epilogue_notes (first);
-
   if (file)
     {
       int i, j, need_comma;

Re: middle-end/6180: Infinite loop in cc1 during dbr pass

[Richard Henderson]

On Sat, Apr 06, 2002 at 03:12:23PM -0500, John David Anglin wrote:
> 	* reorg.c (dbr_schedule): Don't reposition prologue and epilogue notes.

Ok.


r~

Re: gcc-64 on HP-UX 11.00

[John David Anglin]

> > The latest 'snapshot' as in gcc-20020408.tar.bz2
> 
> I'll try the current cvs.

I don't get the warnings or the seg fault.  Have you got a recent header
and libc patch installed on your system?  I have PHCO_23963 and PHCO_25707.
You will need to figure out where the warnings are coming from by looking at
the cpp output.

Some of the warnings seem to be from the macro definition for obstack_free
in include/obstack.h.  The cast to int might be a problem on hppa64

# if defined __STDC__ && __STDC__
#  define obstack_free(h,obj)                                           \
( (h)->temp = (char *) (obj) - (char *) (h)->chunk,                     \
  (((h)->temp > 0 && (h)->temp < (h)->chunk_limit - (char *) (h)->chunk)\
   ? (int) ((h)->next_free = (h)->object_base                           \
	    = (h)->temp + (char *) (h)->chunk)                          \
   : (((obstack_free) ((h), (h)->temp + (char *) (h)->chunk), 0), 0)))

since pointers are 64bit and ints 32bit.  This is probably not the problem
since the function version of obstack_free returns void.

What version of cc do you have?

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc-64 on HP-UX 11.00

[John David Anglin]

>  In message <200204111518.g3BFIoZE029965@hiauly1.hia.nrc.ca>, "John David Anglin
> " writes:
>  > Gcc doesn't generate inline plabels on the PA.  It would save one insn
>  > and one data location if we could use these selectors.  However, there
>  > have been problems with them in 32bit land for years.  I think the
>  > current assembler can handle them but the SOM linker still doesn't
>  > handle them.
> Actually the SOM linker can handle them, but there are corner cases with 
> very large executables where it's impossible for the SOM linker to properly
> fixup an inline plabel.  For that reason we stopped using them based on
> a recommendation from HP.

Interesting.  The problem might be in the dynamic loader.  In the research
I did for this patch <http://gcc.gnu.org/ml/gcc-patches/2002-04/msg00394.html>,
I tried using inline plabels with both the HP and GNU assembler/linkers
since this would have made the definition of ASM_OUTPUT_MI_THUNK considerably
simpler.  The HP assembler/linker compiled my little test PIC program
with inline plabels.  However, when I executed it, the address loaded was
not the address of a function descriptor for the thunk target function.
GAS didn't like the LTP/RTP selectors at all.  Thus, I was forced to create
a plabel in the data section.  It was a bit tricky to do this in a manner
that was compatible with both hpux and linux.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc-64 on HP-UX 11.00

[H.Merijn Brand]

On Thu 11 Apr 2002 19:14, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> >  In message <200204111518.g3BFIoZE029965@hiauly1.hia.nrc.ca>, "John David Anglin
> > " writes:
> >  > Gcc doesn't generate inline plabels on the PA.  It would save one insn
> >  > and one data location if we could use these selectors.  However, there
> >  > have been problems with them in 32bit land for years.  I think the
> >  > current assembler can handle them but the SOM linker still doesn't
> >  > handle them.
> > Actually the SOM linker can handle them, but there are corner cases with 
> > very large executables where it's impossible for the SOM linker to properly
> > fixup an inline plabel.  For that reason we stopped using them based on
> > a recommendation from HP.
> 
> Interesting.  The problem might be in the dynamic loader.  In the research
> I did for this patch <http://gcc.gnu.org/ml/gcc-patches/2002-04/msg00394.html>,
> I tried using inline plabels with both the HP and GNU assembler/linkers
> since this would have made the definition of ASM_OUTPUT_MI_THUNK considerably
> simpler.  The HP assembler/linker compiled my little test PIC program
> with inline plabels.  However, when I executed it, the address loaded was
> not the address of a function descriptor for the thunk target function.
> GAS didn't like the LTP/RTP selectors at all.  Thus, I was forced to create
> a plabel in the data section.  It was a bit tricky to do this in a manner
> that was compatible with both hpux and linux.

I'm off now. If you want me to do more tests, please leave instructions on the
door when you leave. No problems with downloading another source tree, as long
as it is http https or ftp

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.7.3 & 631 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
     WinNT 4, Win2K pro & WinCE 2.11 often with Tk800.024 &/| DBD-Unify
ftp://ftp.funet.fi/pub/languages/perl/CPAN/authors/id/H/HM/HMBRAND/

Re: gcc-64 on HP-UX 11.00

[law]

 In message <200204111714.g3BHEf2h000643@hiauly1.hia.nrc.ca>, "John David 
Anglin" writes:
 > Interesting.  The problem might be in the dynamic loader.
It was definitely the linker.  If I recall correctly the problem was related
to the need for the linker to rewrite the inline plabel sequence when the 
plabel
was satisfied from a shared library with an insanely large PLT.

jeff

Re: gcc-64 on HP-UX 11.00

[John David Anglin]

> However, the code from the actual perl function looks like:
> 
>         cmpib,= 0,%r3,L$1012
> 	addil LT'PL_sv_no,%r27
> 	addil LT'PL_sv_yes,%r27
> 	b L$1013
> 	fldd RT'PL_sv_yes(%r1),%fr22
> L$1012
> 	fldd RT'PL_sv_no(%r1),%fr22
> L$1013
> 	fstd %fr22,-272(%r30)
> 	b L$0783
> 	ldd -272(%r30),%r25
> 	[...]
> L$1017
>         copy %r28,%r25
> L$0783
>         copy %r25,%r28
> 	[restore registers and return]

I tested this with gcc 3.0.3 -O -mpa-risc-2-0 -fPIC (32bit) and the code is:

        cmpib,= 0,%r28,L$0940
	addil LT'PL_sv_yes,%r19
	b L$0733
	ldw RT'PL_sv_yes(%r1),%r28
L$0940
	addil LT'PL_sv_no,%r19
	b L$0733
	ldw RT'PL_sv_no(%r1),%r28

So, this worked with 3.0.3 and we have a regression.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc-64 on HP-UX 11.00

[law]

In message <200204152027.g3FKRLuZ009642@hiauly1.hia.nrc.ca>, "John David Anglin
" writes:
 > > However, the code from the actual perl function looks like:
 > > 
 > >         cmpib,= 0,%r3,L$1012
 > > 	addil LT'PL_sv_no,%r27
 > > 	addil LT'PL_sv_yes,%r27
 > > 	b L$1013
 > > 	fldd RT'PL_sv_yes(%r1),%fr22
 > > L$1012
 > > 	fldd RT'PL_sv_no(%r1),%fr22
 > > L$1013
 > > 	fstd %fr22,-272(%r30)
 > > 	b L$0783
 > > 	ldd -272(%r30),%r25
 > > 	[...]
 > > L$1017
 > >         copy %r28,%r25
 > > L$0783
 > >         copy %r25,%r28
 > > 	[restore registers and return]
 > 
 > I tested this with gcc 3.0.3 -O -mpa-risc-2-0 -fPIC (32bit) and the code is:
 > 
 >         cmpib,= 0,%r28,L$0940
 > 	addil LT'PL_sv_yes,%r19
 > 	b L$0733
 > 	ldw RT'PL_sv_yes(%r1),%r28
 > L$0940
 > 	addil LT'PL_sv_no,%r19
 > 	b L$0733
 > 	ldw RT'PL_sv_no(%r1),%r28
 > 
 > So, this worked with 3.0.3 and we have a regression.
I don't doubt that it worked in the past.  My point is that selecting an
FP register to hold an address like this is an exceedingly bad thing to
do.  In fact, not assigning the value to a register and instead leaving it
in memory is actually cheaper than assigning it to an FP register.

In fact, from the fragments, it looks like we did something insanely stupid,
why don't we assign the value to %r28 or %r25?

jeff

Re: gcc-64 on HP-UX 11.00

[John David Anglin]

> I don't doubt that it worked in the past.  My point is that selecting an

My point in looking at whether it worked in the past was simply to determine
whether this was in fact a regression, and whether a fix could be applied
to the 3.1 branch.

> FP register to hold an address like this is an exceedingly bad thing to
> do.  In fact, not assigning the value to a register and instead leaving it
> in memory is actually cheaper than assigning it to an FP register.

I don't quite follow that logic.  Two insns are needed to load the
address and the result must end up in a register.  You can't load
the address directly to memory.  It takes a couple of insns to copy
the result from the FP register to a general register.  Generally,
I guess this must be weighed against the cost of freeing up a general
general.

> In fact, from the fragments, it looks like we did something insanely stupid,
> why don't we assign the value to %r28 or %r25?

I agree it seems very dumb.  We have the following rtl at the end of
function after lreg:

(insn 3088 3494 3091 (set (reg/i:DI 28 %r28)
        (reg/f:DI 66)) 119 {*pa.md:3106} (nil)
    (expr_list:REG_DEAD (reg/f:DI 66)
	(nil)))

DI 66 is set in multiple places.  It seems the compiler doesn't
recognize opportunities to replace DI 66 with DI 28, and so on.

Jeff, I will send you gv.i offline so that you can look at the problem
in more detail.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

gcc-64 20021111 broken on HP-UX 11.00

[H.Merijn Brand]

2002-11-11 is broken for 64bit on HP-UX. 2002-11-04 still worked ...
FWIW 32bit version worked perfect

I'll try to rebuild gcc64 from scratch without using the 20021104 vs

a5:/pro/3gl/GNU/gcc 113 > ll -d src gcc-*
  38813 drwxrwxrwx   17 merijn   softwr       2048 Nov 12 18:38 gcc-20021111
  33464 -rw-r--r--    1 merijn   softwr   20243290 Nov 12 13:24 gcc-20021111.tbz
  33916 lrwxrwxrwx    1 merijn   softwr         12 Nov 12 18:38 src -> gcc-20021111
a5:/pro/3gl/GNU/gcc 114 > cat Conf-gcc64
#!/usr/bin/sh

export CONFIG_SITE=
export CC="gcc64 -mpa-risc-2-0"
export PATH=.:/usr/local/pa20_64/bin:/pro/local/bin
export PATH=$PATH"":/usr/bin:/opt/ansic/bin:/usr/ccs/bin:/opt/langtools/bin
export PATH=$PATH"":/opt/imake/bin

rm -rf obj
mkdir obj
cd obj
../src/configure \
    --enable-languages=c,c++ \
    --prefix=/usr/local/pa20_64 --with-local-prefix=/usr/local/pa20_64 \
    --with-gnu-as --with-as=/usr/local/pa20_64/bin/as \
    --with-gnu-ld --with-ld=/usr/local/pa20_64/bin/ld \
    --disable-shared \
    --disable-nls \
    --host=hppa64-hp-hpux11.00

echo ""
echo "Now start 'Build-gcc64'"
a5:/pro/3gl/GNU/gcc 115 > gcc64 --version
gcc64 (GCC) 3.3 20021104 (experimental)
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

a5:/pro/3gl/GNU/gcc 116 > sh -x Conf-gcc64
+ export CONFIG_SITE=
+ export CC=gcc64 -mpa-risc-2-0
+ export PATH=.:/usr/local/pa20_64/bin:/pro/local/bin
+ export PATH=.:/usr/local/pa20_64/bin:/pro/local/bin:/usr/bin:/opt/ansic/bin:/usr/ccs/bin:/opt/langtools/bin
+ export PATH=.:/usr/local/pa20_64/bin:/pro/local/bin:/usr/bin:/opt/ansic/bin:/usr/ccs/bin:/opt/langtools/bin:/opt/imake/bin
+ rm -rf obj
+ mkdir obj
+ cd obj
+ ../src/configure --enable-languages=c,c++ --prefix=/usr/local/pa20_64 --with-local-prefix=/usr/local/pa20_64 --with-gnu-as
 --with-as=/usr/local/pa20_64/bin/as --with-gnu-ld --with-ld=/usr/local/pa20_64/bin/ld --disable-shared --disable-nls --host
=hppa64-hp-hpux11.00
*** This configuration is not supported in the following subdirectories:
     target-libffi target-boehm-gc target-zlib target-libjava target-libf2c zlib fastjar target-libobjc
    (Any other directories should still work fine.)
Created "Makefile" in /pro/3gl/GNU/gcc/obj using "mh-frag"
ldd: "conftest" is not a shared executable.
collect2: /usr/ccs/bin/ldd returned 1 exit status
*** The command 'gcc64 -mpa-risc-2-0 -o conftest -g   conftest.c' failed.
*** You must set the environment variable CC to a working compiler.
+ echo

+ echo Now start 'Build-gcc64'
Now start 'Build-gcc64'
a5:/pro/3gl/GNU/gcc 117 > gcc --version
gcc (GCC) 3.3 20021111 (experimental)
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

a5:/pro/3gl/GNU/gcc 118 >

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.8.0 & 633 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
  WinNT 4, Win2K pro & WinCE 2.11.  Smoking perl CORE: smokers@perl.org
http://archives.develooper.com/daily-build@perl.org/   perl-qa@perl.org
send smoke reports to: smokers-reports@perl.org, QA: http://qa.perl.org

Re: gcc-64 20021111 broken on HP-UX 11.00

[H.Merijn Brand]

On Wed 13 Nov 2002 11:24, H.Merijn Brand <h.m.brand@hccnet.nl> wrote:
> 2002-11-11 is broken for 64bit on HP-UX. 2002-11-04 still worked ...
> FWIW 32bit version worked perfect
> 
> I'll try to rebuild gcc64 from scratch without using the 20021104 vs

That succeeded. Installed OK. Now use that to rebuild gcc64:

   ` if [ -f /pro/3gl/GNU/gcc/obj/gcc/../binutils/ranlib ] ; then echo /pro/3gl/GNU/gcc/obj/gcc/../binutils/ranlib ; else if [ "hppa64-hp-hpux11.00" = "hppa64-hp-hpux11.00" ] ; then echo ranlib; else t='s,^,hppa64-hp-hpux11.00-,'; echo ranlib | sed -e $t ; fi; fi` stage1/libgcc_eh.a; \
  else true; fi; fi
for f in .. ; do if [ x${f} != x.. ]; then \
  cp stage1/${f} . ; \
else true; \
fi; done
mv cp/*.o stage1/cp
mv: cp/*.o: cannot access: No such file or directory
make[2]: [c++.stage1] Error 1 (ignored)
make[2]: Leaving directory `/pro/3gl/GNU/gcc/obj/gcc'
echo timestamp > stage1_copy
echo stage2_build > stage_last
(cd stage1 && rm -f `echo main.o libbackend.a alias.o bb-reorder.o bitmap.o builtins.o caller-save.o calls.o cfg.o cfganal.o cfgbuild.o cfgcleanup.o cfglayout.o cfgloop.o cfgrtl.o combine.o conflict.o convert.o cse.o cselib.o dbxout.o debug.o df.o diagnostic.o doloop.o dominance.o dwarf2asm.o dwarf2out.o dwarfout.o emit-rtl.o except.o explow.o expmed.o expr.o final.o flow.o fold-const.o function.o gcse.o genrtl.o ggc-common.o global.o graph.o gtype-desc.o haifa-sched.o hashtable.o hooks.o ifcvt.o insn-attrtab.o insn-emit.o insn-extract.o insn-opinit.o insn-output.o insn-peep.o insn-recog.o integrate.o intl.o jump.o  langhooks.o lcm.o lists.o local-alloc.o loop.o mbchar.o optabs.o params.o predict.o print-rtl.o print-tree.o profile.o ra.o ra-build.o ra-colorize.o ra-debug.o ra-rewrite.o real.o recog.o reg-stack.o regclass.o regmove.o regrename.o reload.o reload1.o reorg.o resource.o rtl.o rtlanal.o rtl-error.o sbitmap.o sched-deps.o sched-ebb.o sched-rgn.o sched-vis.o sdbout.o sibcall.o simplify-rtx.o ssa.o ssa-ccp.o ssa-dce.o stmt.o stor-layout.o stringpool.o timevar.o toplev.o tracer.o tree.o tree-dump.o tree-inline.o unroll.o varasm.o varray.o version.o vmsdbgout.o xcoffout.o et-forest.o ggc-page.o pa.o  c-parse.o c-lang.o c-pretty-print.o attribs.o c-errors.o c-lex.o c-pragma.o c-decl.o c-typeck.o c-convert.o c-aux-info.o c-common.o c-opts.o c-format.o c-semantics.o c-objc-common.o c-dump.o libcpp.a  cpplib.o cpplex.o cppmacro.o cppexp.o cppfiles.o cpptrad.o cpphash.o cpperror.o cppinit.o cppdefault.o cppmain.o hashtable.o line-map.o mkdeps.o prefix.o mbchar.o *.c *.h gen*`)
echo timestamp > clean_s1
make CC=" stage1/xgcc -Bstage1/ -B/usr/local/pa20_64/hppa64-hp-hpux11.00/bin/" \
         STAGE_PREFIX=stage1/ \
         ADAC="\$(CC)" CFLAGS="-g -O2" LDFLAGS="" WARN_CFLAGS="\$(GCC_WARN_CFLAGS)" STRICT_WARN="-Wtraditional -pedantic -Wno-long-long" libdir=/usr/local/pa20_64/lib LANGUAGES="c gcov c++" MAKEOVERRIDES= OUTPUT_OPTION="-o \$@"
make[2]: Entering directory `/pro/3gl/GNU/gcc/obj/gcc'
stage1/xgcc -Bstage1/ -B/usr/local/pa20_64/hppa64-hp-hpux11.00/bin/ -c   -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long -fno-common  -DHAVE_CONFIG_H -DGENERATOR_FILE    -I. -I. -I../../src/gcc -I../../src/gcc/. -I../../src/gcc/config -I../../src/gcc/../include ../../src/gcc/gengenrtl.c -o gengenrtl.o
stage1/xgcc -Bstage1/ -B/usr/local/pa20_64/hppa64-hp-hpux11.00/bin/   -g -O2 -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long -fno-common  -DHAVE_CONFIG_H -DGENERATOR_FILE  -o gengenrtl \
 gengenrtl.o ../libiberty/libiberty.a
ldd: "gengenrtl" is not a shared executable.
collect2: /usr/ccs/bin/ldd returned 1 exit status
make[2]: *** [gengenrtl] Error 1
make[2]: Leaving directory `/pro/3gl/GNU/gcc/obj/gcc'
make[1]: *** [stage2_build] Error 2
make[1]: Leaving directory `/pro/3gl/GNU/gcc/obj/gcc'
make: *** [bootstrap-lean] Error 2
Exit 2
a5:/pro/3gl/GNU/gcc 131 > gcc64 --version
gcc64 (GCC) 3.3 20021111 (experimental)
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

a5:/pro/3gl/GNU/gcc 132 >

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.8.0 & 633 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
  WinNT 4, Win2K pro & WinCE 2.11.  Smoking perl CORE: smokers@perl.org
http://archives.develooper.com/daily-build@perl.org/   perl-qa@perl.org
send smoke reports to: smokers-reports@perl.org, QA: http://qa.perl.org

Re: gcc-64 20021111 broken on HP-UX 11.00

[John David Anglin]

> ldd: "gengenrtl" is not a shared executable.

This is in fact a GNU ld bug.  If you use chatr, you will see that gengenrtl
is an incomplete executable and has dependencies on shared libraries.
ldd should list the dependent shared libraries.  It does if you build using
the HP linker.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc-64 20021111 broken on HP-UX 11.00

[John David Anglin]

> ldd: "gengenrtl" is not a shared executable.
> collect2: /usr/ccs/bin/ldd returned 1 exit status

I have installed the patch below and it should fix the above problem.

However, we are back to the previous situation where global constructors
and destructors in dependent libraries are not executed.  This causes
a variety of regressions when the HP linker was being used.  For example,
objc is essentially unusable and g++ is compromised.  This of course
is also the state with GNU ld.

If you use the HP linker, LD_INIT_SWITCH and LD_FINI_SWITCH can be
defined as shown below and this results in GCC testsuite results
fairly comparable to that of the 32-bit ports.  You can even enable
the building of a shared libgcc in config.gcc.

Unfortunately, LD_INIT_SWITCH and LD_FINI_SWITCH can't be defined
with the GNU linker without other nasty things happening.  As far
as I can tell, there is no way to define these symbols without
making the GCC code linker dependent.  I don't think we want to
do this at this time, so I have disabled the above two macros.
Hopefully, the GNU ld bugs can be fixed in the near future and we
can use the above macros, or possibly .init and .fini sections.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

2002-11-13  John David Anglin  <dave@hiauly1.hia.nrc.ca>

	* pa64-hpux.h (LINK_SPEC): Move "+Accept TypeMismatch" switch to the
	beginning of the spec.
	(LDD_SUFFIX, PARSE_LDD_OUTPUT): Delete.
	(LD_INIT_SWITCH, LD_FINI_SWITCH): Define but don't enable.  Add comment
	regarding problems with global constructors when using GNU ld.

Index: config/pa/pa64-hpux.h
===================================================================
RCS file: /cvsroot/gcc/gcc/gcc/config/pa/pa64-hpux.h,v
retrieving revision 1.18
diff -u -3 -p -r1.18 pa64-hpux.h
--- config/pa/pa64-hpux.h	10 Nov 2002 01:14:47 -0000	1.18
+++ config/pa/pa64-hpux.h	13 Nov 2002 17:12:03 -0000
@@ -31,14 +31,16 @@ Boston, MA 02111-1307, USA.  */
      N_("Assume code will be linked by HP ld") },
 
 /* We can debug dynamically linked executables on hpux11; we also
-   want dereferencing of a NULL pointer to cause a SEGV.  */
+   want dereferencing of a NULL pointer to cause a SEGV.  Do not move
+   the "+Accept TypeMismatch" switch.  We check for it in collect2
+   to determine which init/fini is needed.  */
 #undef LINK_SPEC
 #if ((TARGET_DEFAULT | TARGET_CPU_DEFAULT) & MASK_GNU_LD)
 #define LINK_SPEC \
-  "-E %{mlinker-opt:-O} %{!shared:-u main} %{static:-a archive} %{shared:%{mhp-ld:-b}%{!mhp-ld:-shared}} %{mhp-ld:+Accept TypeMismatch}"
+  "%{mhp-ld:+Accept TypeMismatch} -E %{mlinker-opt:-O} %{!shared:-u main} %{static:-a archive} %{shared:%{mhp-ld:-b}%{!mhp-ld:-shared}}"
 #else
 #define LINK_SPEC \
-  "-E %{mlinker-opt:-O} %{!shared:-u main} %{static:-a archive} %{shared:%{mgnu-ld:-shared}%{!mgnu-ld:-b}} %{!mgnu-ld:+Accept TypeMismatch}"
+  "%{!mgnu-ld:+Accept TypeMismatch} -E %{mlinker-opt:-O} %{!shared:-u main} %{static:-a archive} %{shared:%{mgnu-ld:-shared}%{!mgnu-ld:-b}}"
 #endif
 
 /* Like the default, except no -lg.  */
@@ -252,19 +254,26 @@ do {								\
 
 /* Since we are not yet using .init and .fini sections, we need to
    explicitly arrange to run the global constructors and destructors.
-   HPUX 11 has ldd and we use it to determine the dependencies of
-   dynamic objects.  It might be possible to use the ld options for
-   running initializers and terminators and thereby avoid the necessity
-   of running ldd, but unfortunately the options are different for
-   the two linkers.  */
-#define LDD_SUFFIX "/usr/ccs/bin/ldd"
-
-/* Skip to first '>' then advance to '/' at the beginning of the filename.  */
-#define PARSE_LDD_OUTPUT(PTR)					\
-do {								\
-  while (*PTR != '>') PTR++;					\
-  while (*PTR != '/') PTR++;					\
-} while (0)
+   We could use ldd for this but it depends on LD_LIBRARY_PATH being
+   correctly set.  So, we use the ld init and fini switches. However,
+   we need to support different switches for the GNU and HP linkers.
+   We can't check TARGET_GNU_LD in collect2, so we need a different
+   test.  The +Accept switch is always the first switch when we are
+   using the HP linker (see define for LINK_SPEC).  Checking for it
+   is a somewhat fragile as it depends on internal details of the
+   collect2 program but it is better than testing ld_file_name.
+
+   FIXME: The GNU linker is broken.  The -init/-fini switches don't
+   work and ldd can't determine the dynamic dependences of executables
+   linked with GNU ld.  The init and fini routines are not executed
+   although DT_INIT and DT_FINI appear ok.  As a result, defining
+   LD_INIT_SWITCH and LD_FINI_SWITCH causes more harm than good when
+   using GNU ld.  However, the definitions appear to work fine with
+   the HP linker.  */
+#if 0
+#define LD_INIT_SWITCH (strcmp ("+Accept", ld2_argv[1]) ? "-init" : "+init")
+#define LD_FINI_SWITCH (strcmp ("+Accept", ld2_argv[1]) ? "-fini" : "+fini")
+#endif
 
 /* If using HP ld do not call pxdb.  Use size as a program that does nothing
    and returns 0.  /bin/true cannot be used because it is a script without

Re: gcc-64 20021111 broken on HP-UX 11.00

[H.Merijn Brand]

On Wed 13 Nov 2002 22:04, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> > ldd: "gengenrtl" is not a shared executable.
> > collect2: /usr/ccs/bin/ldd returned 1 exit status
> 
> I have installed the patch below and it should fix the above problem.

Confirm. Now works for gcc64.

> However, we are back to the previous situation where global constructors
> and destructors in dependent libraries are not executed.  This causes
> a variety of regressions when the HP linker was being used.  For example,
> objc is essentially unusable and g++ is compromised.  This of course
> is also the state with GNU ld.

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.8.0 & 633 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
  WinNT 4, Win2K pro & WinCE 2.11.  Smoking perl CORE: smokers@perl.org
http://archives.develooper.com/daily-build@perl.org/   perl-qa@perl.org
send smoke reports to: smokers-reports@perl.org, QA: http://qa.perl.org

Re: gcc-64 20021111 broken on HP-UX 11.00

[John David Anglin]

> 2002-11-11 is broken for 64bit on HP-UX. 2002-11-04 still worked ...
> FWIW 32bit version worked perfect

Sigh, I know.  I am testing a "fix".  However, the problem is really
GNU ld is broken.  Using HP ld should work fine.

I tried to fix the fact that constructors are not being collected
from dependent shared libraries.  Unfortunately, I missed testing
with GNU ld as I was mainly concerned about assembler issues.
This is what ld reports for any executable (not shared libraries)

bash-2.05a$ ldd cc1
ldd: "cc1" is not a shared executable.

I must admit that I first noted a problem using ldd to find
dependencies when I tried a bootstrap with the HP linker and a shared
libgcc.  The problem is LD_LIBRARY_PATH needs to be set correctly
for it to work and this is problematic when building packages
with shared libraries.

Basically, we have to back out from trying to search dependencies
for global constructors until GNU ld is fixed.  This leaves using
shared libraries with constructors broken (various v3, g++ and objc
testsuite fails are caused by this).

I tested an alternative approach using the +init/+fini switches
with the HP linker.  This works fine and I was sucessful building
gcc with a shared libgcc with no regressions.  However, with
the GNU linker, we hit another bug.  The init and fini routines are
not called although DT_INIT and DT_FINI look ok.  The result of this
is worse than not doing the dependency search, so we are in dammed
if we do and dammed if we don't situation.

Anyhow, either use the HP linker or "--disable-shared" for the moment.
I will install a patch later today to restore the previous behavior.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: bison 1.33 problem with mainline c-parse.in: yyfree_stacks

[John David Anglin]

> > /berman/migchain/install/native/bison-1.33/share/bison/bison.simple: In function `yyparse':
> > /berman/migchain/install/native/bison-1.33/share/bison/bison.simple:521: `yyfree_stacks' undeclared (first use in this function)

It looks like this incompatibility was introduced by this patch:

2002-04-25  Richard Henderson  <rth@redhat.com>

        PR c/2161
	* c-parse.in (yyoverflow): New.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: corrections to recent profile-arcs change

[John David Anglin]

> FAIL: g++.dg/bprob/bprob-1.C compilation,  -O2  -fprofile-arcs

This one a SIGSEGV:

(gdb) r -fprofile-arcs -O2 bprob-1.ii
...
Program received signal SIGSEGV, Segmentation fault.
0x0010c574 in ok_to_generate_alias_set_for_type (t=0x402dda10)
    at ../../gcc/gcc/cp/cp-lang.c:214
214               if (! CLASSTYPE_NON_POD_P(t))

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: vax double precision broken

[Joe Buck]

> The single and double IEEE formats do indeed look similar to VAX F and
> G formats respectively, but they do NOT match.  There are three key
> differences: the halfwords are in the opposite order (sign bit is bit
> 31 in each case for IEEE); the exponent bias is one less -- 127 and
> 1023 for IEEE vs. 128 and 1024 for VAX; and the hidden high order bit
> is interpreted as the bit just to the left of the binary point (2**0)
> in IEEE rather than just to the right (2**-1) as in VAX.  (In
> addition, IEEE has both Inf and NaN, while DEC format only has NaN.
> And IEEE has denormals; DEC does not.)

There's a 4th difference: F-floating has the same exponent size as IEEE
single precision, but D-floating has the same number of exponent bits
as F-floating while IEEE doubles have more exponent bits.  (Conversion
from Vax-D to Vax-F is a simple matter of rounding off the mantissa, while
for IEEE, overflow can occur because the double precision type has greater
range).

Re: Bootstrapping hppa64? CPP problem

[John David Anglin]

> > I am curious if anyone is currently bootstrapping the hppa64 GCC
> > compiler from the latest sources?  I am running into a very curious cpp
> > problem.  With the attached example, using the cc1 that I just built I
> > get two definitions of sigpause showing up because _SVID2 seems to be
> > considered defined and undefined at the same time.  It doesn't happen on
> > the other platforms I have tried but it happens consistenly for me on
> > PA64.

I am currently bootstrapping the latest sources for 3.1.1 and 3.2.
3.2 is now in stage2 and doesn't exhibit the problem described, so I
expect that you have a problem with your tools.

There have been a fair number of changes to binutils affecting hppa64
in the last month or so.  I suggest you rebuild them.  The only unexpected
errors should be 7 in the ld suite.  Then, I suggest that you build
3.1.1 starting with either the HP builtin or ANSI compiler.  You should
be able to build 3.2 starting with the HP ANSI compiler.  I'm using
3.1.1 as my default for hppa64 builds.

I will let you know if the problem that you describe appears later
in the build process.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: [parisc-linux] gcc-3.[02] alignment problem

[John David Anglin]

> These messages are coming from the assembler (remove "-pipe").  The
> first is from "std %r4,44(%r3)".  The offset "44" is not correct for
> a store double.  This is probably a problem with pointer arithmetic
> in the source.

Check the definition of RTA_ALIGNTO in linux/rtnetlink.h.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: [parisc-linux] gcc-3.[02] alignment problem

[Randolph Chung]

In reference to a message from John David Anglin, dated Jul 16:
> > These messages are coming from the assembler (remove "-pipe").  The
> > first is from "std %r4,44(%r3)".  The offset "44" is not correct for
> > a store double.  This is probably a problem with pointer arithmetic
> > in the source.
> 
> Check the definition of RTA_ALIGNTO in linux/rtnetlink.h.

ah, this is not it, but i see what it is now.

include/linux/tcp_diag.h defines:

struct tcpdiag_sockid
{
        __u16   tcpdiag_sport;
        __u16   tcpdiag_dport;
        __u32   tcpdiag_src[4];
        __u32   tcpdiag_dst[4];
        __u32   tcpdiag_if;
        __u32   tcpdiag_cookie[2]; 
#define TCPDIAG_NOCOOKIE (~0U)
};

the code goes on to do:
        *((struct sock **)&r->id.tcpdiag_cookie) = sk;
and
            sk != *((struct sock **)&req->id.tcpdiag_cookie[0]))

even tho tcpdiag_cookie looks like it can be 64-bit aligned in the
struct, it appears that it isn't.... 

the "vomit grade hack" alan mentioned in another post is that in our
tree, we have:

struct tcpdiag_sockid
{
        __u16   tcpdiag_sport;
        __u16   tcpdiag_dport;
        __u32   tcpdiag_src[4];
        __u32   tcpdiag_dst[4];
        __u32   tcpdiag_if;
#if defined (__hppa__) && defined (__LP64__)
        char * parisc_hack_to_align_tcpdiag_cookie;
#endif
        __u32   tcpdiag_cookie[2];
#define TCPDIAG_NOCOOKIE (~0U)
};

why is the offset of tcpdiag_cookie[0] 44 and not 40?

randolph
--  
Randolph Chung
Debian GNU/Linux Developer, hppa/ia64 ports
http://www.tausq.org/

Re: [parisc-linux] gcc-3.[02] alignment problem

[Matthew Wilcox]

On Tue, Jul 16, 2002 at 10:22:55AM -0700, Randolph Chung wrote:
> include/linux/tcp_diag.h defines:
> 
> struct tcpdiag_sockid
> {
>         __u16   tcpdiag_sport;
>         __u16   tcpdiag_dport;
>         __u32   tcpdiag_src[4];
>         __u32   tcpdiag_dst[4];
>         __u32   tcpdiag_if;
>         __u32   tcpdiag_cookie[2]; 
> #define TCPDIAG_NOCOOKIE (~0U)
> };

> why is the offset of tcpdiag_cookie[0] 44 and not 40?

0	tcpdiag_sport
2	tcpdiag_dport
4	tcpdiag_src
20	tcpdiag_dst
36	tcpdiag_if
40	tcpdiag_cookie

hmm.. worth checking that dport is at offset 2, not offset 4?

-- 
Revolutions do not require corporate support.

Re: [parisc-linux] gcc-3.[02] alignment problem

[Randolph Chung]

> > why is the offset of tcpdiag_cookie[0] 44 and not 40?
> 
> 0	tcpdiag_sport
> 2	tcpdiag_dport
> 4	tcpdiag_src
> 20	tcpdiag_dst
> 36	tcpdiag_if
> 40	tcpdiag_cookie
> 
> hmm.. worth checking that dport is at offset 2, not offset 4?

oic, it's embedded inside another structure:

struct tcpdiagmsg
{
        __u8    tcpdiag_family;
        __u8    tcpdiag_state;
        __u8    tcpdiag_timer;
        __u8    tcpdiag_retrans;

        struct tcpdiag_sockid id;

        __u32   tcpdiag_expires;
        __u32   tcpdiag_rqueue;
        __u32   tcpdiag_wqueue;
        __u32   tcpdiag_uid;
        __u32   tcpdiag_inode;
};

that's why it's 44...

randolph

Re: [parisc-linux] gcc-3.[02] alignment problem

[Richard Henderson]

On Tue, Jul 16, 2002 at 10:22:55AM -0700, Randolph Chung wrote:
>         __u32   tcpdiag_cookie[2]; 
> #define TCPDIAG_NOCOOKIE (~0U)
> };
> 
> the code goes on to do:
>         *((struct sock **)&r->id.tcpdiag_cookie) = sk;
> and
>             sk != *((struct sock **)&req->id.tcpdiag_cookie[0]))

This is absolutely awful.

> the "vomit grade hack" alan mentioned in another post is that in our
> tree, we have:
> 
> struct tcpdiag_sockid
> {
>         __u16   tcpdiag_sport;
>         __u16   tcpdiag_dport;
>         __u32   tcpdiag_src[4];
>         __u32   tcpdiag_dst[4];
>         __u32   tcpdiag_if;
> #if defined (__hppa__) && defined (__LP64__)
>         char * parisc_hack_to_align_tcpdiag_cookie;
> #endif
>         __u32   tcpdiag_cookie[2];

An only marginally better fix is

	__u32 tcpdiag_cookie[2] __attribute__((aligned(sizeof(void*))));

Note that this should be unconditional so that the other
64-bit ports don't take an alignment trap here too.

A much nicer fix would be to, gasp, use a union.



r~

Re: mainline bootstrap failure in bitmap.c on sparcv9-sun-solaris2.8

[John David Anglin]

> > stage2/xgcc -Bstage2/ -B/home/c/lucier/local/gcc-test/sparcv9-sun-solaris2.8/bin/ -c -DIN_GCC    -g -O2 -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long  -DHAVE_CONFIG_H -DGENERATOR_FILE    -I. -I. -I../../gcc -I../../gcc/. -I../../gcc/config -I../../gcc/../include ../../gcc/bitmap.c -o bitmap.o
> > In file included from ../../gcc/system.h:171,
> >		   from ../../gcc/bitmap.c:22:
> > 		   ../../gcc/hwint.h:39:9: warning: integer overflow in preprocessor expression
> 
> A similar error occurs on hppa-linux near the end of stage2:
> <http://gcc.gnu.org/ml/gcc/2002-07/msg01238.html>.

The following patch appears to be the origin of the bootstrap failure
under hppa-linux:

2002-07-25  Richard Henderson  <rth@redhat.com>

	* emit-rtl.c (set_mem_attributes): Fix size and alignment thinkos
	in ARRAY_REF of DECL_P case.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: mainline bootstrap failure in bitmap.c on sparcv9-sun-solaris2.8

[Richard Henderson]

On Fri, Jul 26, 2002 at 01:42:06PM -0400, John David Anglin wrote:
> > A similar error occurs on hppa-linux near the end of stage2:
> > <http://gcc.gnu.org/ml/gcc/2002-07/msg01238.html>.
> 
> The following patch appears to be the origin of the bootstrap failure
> under hppa-linux:
> 
> 2002-07-25  Richard Henderson  <rth@redhat.com>
> 
> 	* emit-rtl.c (set_mem_attributes): Fix size and alignment thinkos
> 	in ARRAY_REF of DECL_P case.

Surprising, to say the least, since I can only imagine problems
_without_ that patch, as evidenced by the SH problems it fixed.

If this is a stage2 failure, can you help me out by finding what
bit of stage1 got miscompiled?


r~

Re: mainline bootstrap failure in bitmap.c on sparcv9-sun-solaris2.8

[Richard Henderson]

On Fri, Jul 26, 2002 at 01:42:06PM -0400, John David Anglin wrote:
> The following patch appears to be the origin of the bootstrap failure
> under hppa-linux:
> 
> 2002-07-25  Richard Henderson  <rth@redhat.com>
> 
> 	* emit-rtl.c (set_mem_attributes): Fix size and alignment thinkos
> 	in ARRAY_REF of DECL_P case.

Please try

  http://gcc.gnu.org/ml/gcc-patches/2002-07/msg01625.html


r~

Re: mainline bootstrap failure in bitmap.c on sparcv9-sun-solaris2.8

[John David Anglin]

> > 2002-07-25  Richard Henderson  <rth@redhat.com>
> > 
> > 	* emit-rtl.c (set_mem_attributes): Fix size and alignment thinkos
> > 	in ARRAY_REF of DECL_P case.
> 
> Please try
> 
>   http://gcc.gnu.org/ml/gcc-patches/2002-07/msg01625.html

Looks promising.  Bootstrap is now into stage3.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: mainline bootstrap failure in bitmap.c on sparcv9-sun-solaris2.8

[John David Anglin]

> On Fri, Jul 26, 2002 at 01:42:06PM -0400, John David Anglin wrote:
> > The following patch appears to be the origin of the bootstrap failure
> > under hppa-linux:
> > 
> > 2002-07-25  Richard Henderson  <rth@redhat.com>
> > 
> > 	* emit-rtl.c (set_mem_attributes): Fix size and alignment thinkos
> > 	in ARRAY_REF of DECL_P case.
> 
> Please try
> 
>   http://gcc.gnu.org/ml/gcc-patches/2002-07/msg01625.html

Problem fixed.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc 3.2's cpp breaks configure scripts

[John David Anglin]

> > Turning the warning off is not the correct solution, although there
> > may be some circumstances in which it is emitted when it shouldn't
> > be.
> 
> I think so... but I am probably wrong hehe...

You can display the include search order with "gcc -v -E".  The situation
where gcc emits the message when it shouldn't is when a user include directory
is specified and it is the same as the first directory searched by gcc.
For example,

gcc -v -E main.c -I/opt/gnu/include
...
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/opt/gnu/hppa2.0w-hp-hpux11.00/include"
cpp0: warning: changing search order for system directory "/opt/gnu/include"
cpp0: warning:   as it has already been specified as a non-system directory
ignoring duplicate directory "/opt/gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /opt/gnu/include
 /opt/gnu/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.1.1/include
 /usr/include
End of search list.

As can be seen, the search order hasn't really changed.  If "-I/usr/include"
were added to the command, the search order would really have changed.

These are rules under which the macro lib-prefix.m4 used by configure
in textutils-2.1 adds include directories to CPPFLAGS:

    dnl Potentially add $additional_includedir to $CPPFLAGS.
    dnl But don't add it
    dnl   1. if it's the standard /usr/include,
    dnl   2. if it's already present in $CPPFLAGS,
    dnl   3. if it's /usr/local/include and we are using GCC on Linux,
    dnl   4. if it doesn't exist as a directory.

"/opt/gnu" is my standard prefix.  As can be seen, the above macro
will add "-I/opt/gnu/include" to CPPFLAGS and cause a gcc warning
if something interesting is found there (e.g., libintl.h).

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: soft-float support

[Graeme Peterson]

This got it working.  I also had to add:

  # Do not build libgcc1.
  LIBGCC1 =
  CROSS_LIBGCC1 =

Thanks, all.
GP

> 
> I dug a little and found this, which I copied from t-rs6000:
> 
>    LIB2FUNCS_EXTRA = fp-bit.c dp-bit.c tramp.S
>   
>    dp-bit.c: $(srcdir)/config/fp-bit.c
>          cat $(srcdir)/config/fp-bit.c > dp-bit.c
>   
>    fp-bit.c: $(srcdir)/config/fp-bit.c
>          echo '#define FLOAT' > fp-bit.c
>          cat $(srcdir)/config/fp-bit.c >> fp-bit.c
> 
> I'm building it now, but the comment at the top of fp-bit.c
> seems promising: 
> 
> "/* This is a software floating point library which can be used instead of
>    the floating point routines in libgcc1.c for targets without hardware
>    floating point. */ "
> 
> Think that might be it?  :-)
> 
> GP
> 
> > 
> > Graeme Peterson writes:
> >  > Hi, all.
> >  > 
> >  > I have done some searching, and it seems that gcc (in this case 
> >  > 2.95.3 targetting ppc-QNX6) does not have support for statically
> >  > linked software emulated floating point instructions.
> >  > 
> >  > Can someone clarify for me what is required to get this going?  Do 
> >  > I need to implement the floating point emulation and tell gcc to 
> >  > use it in place of the fadd in the __adddf3 call?  If so, how do I
> >  > do that?
> > 
> > You need to specify the multilibs in your target file for qnx.
> > 
> > For example, in the current gcc source, gcc/config/rs6000/t-rs6000
> > contains
> > 
> > MULTILIB_OPTIONS = msoft-float
> > MULTILIB_DIRNAMES = soft-float
> > 
> > Andrew.
> > 
> 
> 

Re: gcc-64 20021111 broken on HP-UX 11.00

[John David Anglin]

> > ldd: "gengenrtl" is not a shared executable.
> > collect2: /usr/ccs/bin/ldd returned 1 exit status
> 
> I have installed the patch below and it should fix the above problem.

I forgot to say it was tested with both HP and GNU ld on hppa64-hp-hpux11.11.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: HP-UX IA64 Patch to fix earlier patch

[John David Anglin]

> > I am working on using the PARALLEL method for IA64 they way you did on
> > PA64 so we can get rid of FUNCTION_ARG_REG_LITTLE_ENDIAN and noticed
> > that on PA64 you use it in function_arg to handle arguments but there is
> > nothing to handle function return values and I think we need it there
> > too to handle returns of small structures.
> 
> You are correct, PA64 GCC incorrectly returns small structs.  I will
> try and see if I can detemine what is wrong with your patch.

There is a problem with using the PARALLEL method for function
values and sjlj exception handling.  After a lot of C++ debugging, I
have determined why g++.robertl/eb21.C fails with the patch that
I have to return a PARALLEL.

The function _ZSt24__uninitialized_copy_auxIN9........ is miscompiled.
It returns a small structure in register %r28.  The return value is output
by expand_value_return at insn 88 followed by a jump to label 162.
However, after code_label 162, we have a call to _Unwind_SjLj_Unregister
which clobbers the return value %r28.  It would also clobber any
value in the other return register %r29.

The call to _Unwind_SjLj_Unregister obviously has to occur before
the return value is copied to the return registers but I am not sure
how to do this.  I am not sure why this isn't a problem when we don't
use a PARALLEL.  There is a bug in cfg.c that causes an ICE when
dumping rtl.  The global max_regno is not always in sync with the
number of pseudos.  I need to rebuild gcc with this fixed before
I can compare what happens without PARALLEL function values.

The rtl from the first jump pass is enclosed below.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

begin 640 eb21.jump.gz
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%CA%U``!/
`
end

Re: Setting LD tool default to ld breaks configure check for ld used by GCC

[John David Anglin]

> The toplevel configure script sets "LD=ld".  The ld used by the GCC check
> in the opcodes directory has the line 
> 
>   test -z "$LD" && LD="$ac_prog"

The above line comes from libtool.m4.  If we set LD="" in the toplevel
configure script, the libtool script then sets LD to ld program used by
GCC.  However, this define for LD isn't a proper default.  So, I am
wondering if the libtool script should also reset LD when LD=ld?

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Setting LD tool default to ld breaks configure check for ld used by GCC

[John David Anglin]

> > The toplevel configure script sets "LD=ld".  The ld used by the GCC check
> > in the opcodes directory has the line 
> > 
> >   test -z "$LD" && LD="$ac_prog"
> 
> The above line comes from libtool.m4.  If we set LD="" in the toplevel
> configure script, the libtool script then sets LD to ld program used by
> GCC.  However, this define for LD isn't a proper default.  So, I am
> wondering if the libtool script should also reset LD when LD=ld?

After some discussion of this matter on the libtool list, the conclusion
is that Cygnus configure shouldn't be setting LD and other similar defines
in native builds.  PR 9031 has more details.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Miscompilation of glibc with CVS mainline

[John David Anglin]

> > > Here's a small testcase that has the same behaviour:
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > extern void weak_func (void *arg);
> > > asm (".weak weak_func");
> > > 
> > > void
> > > test (void *arg)
> > > {
> > >   if (&weak_func != (void *)0)
> > >     weak_func (arg);
> > >   
> > > }
> > 
> > As GCC is not told in any way that weak_func is actually weak, I think
> > it is glibc's fault.
> 
> This is definitely a gcc problem.  This is the code arising from
> Andreas' testcase for hppa-linux at -O2:
> 
>         stw %r2,-20(%r30)
> 	ldo 64(%r30),%r30
> 	ldw -84(%r30),%r2
> 	bl weak_func,%r0
> 	ldo -64(%r30),%r30
> 
> We have completely lost the `if'.  As a result, weak_func is always
> called.

There is another problem.  The call to weak_func has been turned into
a sibcall.  It seems that TARGET_FUNCTION_OK_FOR_SIBCALL isn't being
consulted as we don't allow indirect sibcalls on hppa-linux.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Miscompilation of glibc with CVS mainline

[Jakub Jelinek]

On Thu, Jan 02, 2003 at 12:48:23PM -0500, John David Anglin wrote:
> There is another problem.  The call to weak_func has been turned into
> a sibcall.  It seems that TARGET_FUNCTION_OK_FOR_SIBCALL isn't being
> consulted as we don't allow indirect sibcalls on hppa-linux.

The call is not indirect, it is normal direct call
(even if weak_func is marked __attribute__((weak)) or #pragma weak).

	Jakub

Re: Miscompilation of glibc with CVS mainline

[John David Anglin]

> The call is not indirect, it is normal direct call
> (even if weak_func is marked __attribute__((weak)) or #pragma weak).

Sorry, for the net garbage.  My original analysis of the glibc problem
involved an indirect call.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Miscompilation of glibc with CVS mainline

[Daniel Jacobowitz]

On Thu, Jan 02, 2003 at 12:48:23PM -0500, John David Anglin wrote:
> > > > Here's a small testcase that has the same behaviour:
> > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > extern void weak_func (void *arg);
> > > > asm (".weak weak_func");
> > > > 
> > > > void
> > > > test (void *arg)
> > > > {
> > > >   if (&weak_func != (void *)0)
> > > >     weak_func (arg);
> > > >   
> > > > }
> > > 
> > > As GCC is not told in any way that weak_func is actually weak, I think
> > > it is glibc's fault.
> > 
> > This is definitely a gcc problem.  This is the code arising from
> > Andreas' testcase for hppa-linux at -O2:
> > 
> >         stw %r2,-20(%r30)
> > 	ldo 64(%r30),%r30
> > 	ldw -84(%r30),%r2
> > 	bl weak_func,%r0
> > 	ldo -64(%r30),%r30
> > 
> > We have completely lost the `if'.  As a result, weak_func is always
> > called.
> 
> There is another problem.  The call to weak_func has been turned into
> a sibcall.  It seems that TARGET_FUNCTION_OK_FOR_SIBCALL isn't being
> consulted as we don't allow indirect sibcalls on hppa-linux.

This isn't an indirect call, though.  weak_func is not a pointer...

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

Re: hppa-linux regressions and 3.2.2 release

[John David Anglin]

> I now have tests running on hppa2.0w-hp-hpux11.11, hppa64-hp-hpux11.00
> and hppa-unknown-linux-gnu including the patch set for the other PR from
> Franz Sirl.  I will post the results as soon as available.

The hppa2.0w-hp-hpux11.11 are complete and identical to the previous
run without Franz's patch:

<http://gcc.gnu.org/ml/gcc-testresults/2003-02/msg00130.html>.

I had to restart the hppa64-hp-hpux11.00 run.  I used the HP linker
and it generates a warning on each link.  This totally messes
up the testsuite results.  I would like to apply the following patch
from Steve Ellcey to correct the problem.  It has been on the main and
3.3 since early last October.  The comment describes what it does.  It
only affects hppa64-hp-hpux11* and doesn't affect code generation.

As you are doing preleases, I will wait for your OK.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

2003-02-02  Steve Ellcey  <sje@cup.hp.com>

        * config/pa/pa64-hpux.h (INIT_ENVIRONMENT): New.

Index: config/pa/pa64-hpux.h
===================================================================
RCS file: /cvsroot/gcc/gcc/gcc/config/pa/pa64-hpux.h,v
retrieving revision 1.9
diff -u -3 -p -r1.9 pa64-hpux.h
--- config/pa/pa64-hpux.h	21 Jan 2002 21:22:19 -0000	1.9
+++ config/pa/pa64-hpux.h	3 Feb 2003 04:38:07 -0000
@@ -232,3 +232,8 @@ do {								\
 #ifndef ASM_DECLARE_RESULT
 #define ASM_DECLARE_RESULT(FILE, RESULT)
 #endif
+
+/* If using HP ld do not call pxdb.  Use size as a program that does nothing
+   and returns 0.  /bin/true cannot be used because it is a script without
+   an interpreter.  */
+#define INIT_ENVIRONMENT "LD_PXDB=/usr/ccs/bin/size"

Re: hppa-linux regressions and 3.2.2 release

[Gabriel Dos Reis]

"John David Anglin" <dave@hiauly1.hia.nrc.ca> writes:

[...]

| As you are doing preleases, I will wait for your OK.

It is OK.

Thanks,

-- Gaby

Re: hppa-linux regressions and 3.2.2 release

[John David Anglin]

> > I now have tests running on hppa2.0w-hp-hpux11.11, hppa64-hp-hpux11.00
> > and hppa-unknown-linux-gnu including the patch set for the other PR from
> > Franz Sirl.  I will post the results as soon as available.
> 
> The hppa2.0w-hp-hpux11.11 are complete and identical to the previous
> run without Franz's patch:

All test runs are complete and posted.  There are no regressions.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: hppa-linux regressions and 3.2.2 release

[Gabriel Dos Reis]

"John David Anglin" <dave@hiauly1.hia.nrc.ca> writes:

| > > I now have tests running on hppa2.0w-hp-hpux11.11, hppa64-hp-hpux11.00
| > > and hppa-unknown-linux-gnu including the patch set for the other PR from
| > > Franz Sirl.  I will post the results as soon as available.
| > 
| > The hppa2.0w-hp-hpux11.11 are complete and identical to the previous
| > run without Franz's patch:
| 
| All test runs are complete and posted.  There are no regressions.

Thanks for the report.  Please commit the set of patches you tested.

This hopefully will be the last patch to commit.

-- Gaby

Re: hppa-linux regressions and 3.2.2 release

[John David Anglin]

> Thanks for the report.  Please commit the set of patches you tested.

Done.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Bootstrap failure on hppa-unknown-linux-gnu, trunk

[John David Anglin]

> stage1/xgcc -Bstage1/ -B/home/dave/opt/gnu/hppa-linux/bin/ -c   -g -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long -fno-common -Werror   -DHAVE_CONFIG_H    -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/config -I../../gcc/gcc/../include
> ../../gcc/gcc/bb-reorder.c -o bb-reorder.o
> ../../gcc/gcc/bb-reorder.c: In function `find_traces':
> ../../gcc/gcc/bb-reorder.c:219: error: unrecognizable insn:
> (insn 776 775 777 0x40568f60 (set (reg:DI 70 %fr23 [252])
> 	(mult:DI (zero_extend:DI (reg:SI 69 %fr22R [246]))
> 	    (reg:DI 74 %fr25))) -1 (nil)
>    (expr_list:REG_UNUSED (reg:SI 71 %fr23R)
> 	(expr_list:REG_DEAD (reg:DI 74 %fr25)
> 	    (nil))))
> ../../gcc/gcc/bb-reorder.c:219: internal compiler error: in num_delay_slots, at insn-attrtab.c:4085

I have determined that it is the addition of this patch that results in
the above ICE:

2003-02-10  Josef Zlomek  <zlomekj@suse.cz>

	* Makefile.in (bb-reorder.o): Add dependency on $(FIBHEAP_H).
	* bb-reorder.c (make_reorder_chain): Deleted.
	(make_reorder_chain_1): Deleted.
	(find_traces): New function.
	(rotate_loop): New function.
	(mark_bb_visited): New function.
	(find_traces_1_round): New function.
	(copy_bb): New function.
	(bb_to_key): New function.
	(better_edge_p): New function.
	(connect_traces): New function.
	(copy_bb_p): New function.
	(get_uncond_jump_length): New function.
	(reorder_basic_blocks): Use new functions (Software Trace Cache).
	* cfgcleanup.c (outgoing_edges_match): Enable crossjumping across loop
	boundaries.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Bootstrap failure on hppa-unknown-linux-gnu, trunk

[Josef Zlomek]

> > stage1/xgcc -Bstage1/ -B/home/dave/opt/gnu/hppa-linux/bin/ -c   -g -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long -fno-common -Werror   -DHAVE_CONFIG_H    -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/config -I../../gcc/gcc/../include
> > ../../gcc/gcc/bb-reorder.c -o bb-reorder.o
> > ../../gcc/gcc/bb-reorder.c: In function `find_traces':
> > ../../gcc/gcc/bb-reorder.c:219: error: unrecognizable insn:
> > (insn 776 775 777 0x40568f60 (set (reg:DI 70 %fr23 [252])
> > 	(mult:DI (zero_extend:DI (reg:SI 69 %fr22R [246]))
> > 	    (reg:DI 74 %fr25))) -1 (nil)
> >    (expr_list:REG_UNUSED (reg:SI 71 %fr23R)
> > 	(expr_list:REG_DEAD (reg:DI 74 %fr25)
> > 	    (nil))))
> > ../../gcc/gcc/bb-reorder.c:219: internal compiler error: in num_delay_slots, at insn-attrtab.c:4085
> 
> I have determined that it is the addition of this patch that results in
> the above ICE:
> 
> 2003-02-10  Josef Zlomek  <zlomekj@suse.cz>
> 
> 	* Makefile.in (bb-reorder.o): Add dependency on $(FIBHEAP_H).
> 	* bb-reorder.c (make_reorder_chain): Deleted.
> 	(make_reorder_chain_1): Deleted.
> 	(find_traces): New function.
> 	(rotate_loop): New function.
> 	(mark_bb_visited): New function.
> 	(find_traces_1_round): New function.
> 	(copy_bb): New function.
> 	(bb_to_key): New function.
> 	(better_edge_p): New function.
> 	(connect_traces): New function.
> 	(copy_bb_p): New function.
> 	(get_uncond_jump_length): New function.
> 	(reorder_basic_blocks): Use new functions (Software Trace Cache).
> 	* cfgcleanup.c (outgoing_edges_match): Enable crossjumping across loop
> 	boundaries.

I apologize for the breakage. It seems that new bb-reorder has uncovered
bugs in machine descriptions.
Honza Hubicka has checked in a patch
(http://gcc.gnu.org/ml/gcc-patches/2003-02/msg00847.html)
which hopefully should enable gcc to bootstrap again.

Josef

Re: Bootstrap failure on hppa-unknown-linux-gnu, trunk

[John David Anglin]

> > > stage1/xgcc -Bstage1/ -B/home/dave/opt/gnu/hppa-linux/bin/ -c   -g -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long -fno-common -Werror   -DHAVE_CONFIG_H    -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/config -I../../gcc/gcc/../include
> > > ../../gcc/gcc/bb-reorder.c -o bb-reorder.o
> > > ../../gcc/gcc/bb-reorder.c: In function `find_traces':
> > > ../../gcc/gcc/bb-reorder.c:219: error: unrecognizable insn:
> > > (insn 776 775 777 0x40568f60 (set (reg:DI 70 %fr23 [252])
> > > 	(mult:DI (zero_extend:DI (reg:SI 69 %fr22R [246]))
> > > 	    (reg:DI 74 %fr25))) -1 (nil)
> > >    (expr_list:REG_UNUSED (reg:SI 71 %fr23R)
> > > 	(expr_list:REG_DEAD (reg:DI 74 %fr25)
> > > 	    (nil))))
> > > ../../gcc/gcc/bb-reorder.c:219: internal compiler error: in num_delay_slots, at insn-attrtab.c:4085
> > 
> > I have determined that it is the addition of this patch that results in
> > the above ICE:
> > 
> > 2003-02-10  Josef Zlomek  <zlomekj@suse.cz>
> > 
> > 	* Makefile.in (bb-reorder.o): Add dependency on $(FIBHEAP_H).
> > 	* bb-reorder.c (make_reorder_chain): Deleted.
> > 	(make_reorder_chain_1): Deleted.
> > 	(find_traces): New function.
> > 	(rotate_loop): New function.
> > 	(mark_bb_visited): New function.
> > 	(find_traces_1_round): New function.
> > 	(copy_bb): New function.
> > 	(bb_to_key): New function.
> > 	(better_edge_p): New function.
> > 	(connect_traces): New function.
> > 	(copy_bb_p): New function.
> > 	(get_uncond_jump_length): New function.
> > 	(reorder_basic_blocks): Use new functions (Software Trace Cache).
> > 	* cfgcleanup.c (outgoing_edges_match): Enable crossjumping across loop
> > 	boundaries.
> 
> I apologize for the breakage. It seems that new bb-reorder has uncovered
> bugs in machine descriptions.
> Honza Hubicka has checked in a patch
> (http://gcc.gnu.org/ml/gcc-patches/2003-02/msg00847.html)
> which hopefully should enable gcc to bootstrap again.

I have been looking at the patterns which use the xmpyu insn on the PA.
There are two patterns (32 and 64 bit) which have an uint32_operand
predicate and "f" constraint.  The "f" constraint is inconsistent with
the predicate.  The uint32_operand predicate is inconsistent with the
actual capability of the machine instruction.  I had queried Jeff Law
about this in the past.  This was his response:

   > I thought changing the operands of the pattern to register_operand is a more
   > accurate description of the machine insn although reloads still can
   > potentially occur.
     It's certainly more accurate, but due to secondary effects of register
     allocation
     and reloading it's actually more profitable to be more general in the
     operand predicates than what the instruction actually allows.  That is
     generally a bad thing to do, but from time to time it is helpful.

Basically, some games are being played with the predicate and constraint
to improve the generated code.

The 32-bit seems to be building again.  However, the have been some
"strange" warning messages on hppa64-hp-hpux11.11:

g-yacc.29398.c: In function `yystrlen':
g-yacc.29398.c:708: warning: traditional C rejects ISO C style function definiti
ons
g-yacc.29398.c: In function `yystpcpy':
g-yacc.29398.c:733: warning: traditional C rejects ISO C style function definiti
ons
g-yacc.29398.c: In function `yydestruct':
g-yacc.29398.c:800: warning: traditional C rejects ISO C style function definiti
ons
g-yacc.29398.c: In function `yyparse':
g-yacc.29398.c:863: warning: traditional C rejects ISO C style function definiti
ons

and

c-p29635.c: In function `yy_stack_print':
c-p29635.c:2150: warning: traditional C rejects ISO C style function definitions
c-p29635.c: In function `yy_reduce_print':
c-p29635.c:2176: warning: traditional C rejects ISO C style function definitions
c-p29635.c: In function `yysymprint':
c-p29635.c:2297: warning: traditional C rejects ISO C style function definitions
c-p29635.c: In function `yydestruct':
c-p29635.c:2333: warning: traditional C rejects ISO C style function definitions
c-p29635.c: In function `yyparse':
c-p29635.c:2396: warning: traditional C rejects ISO C style function definitions

Possibly, this is a bison 1.875 problem.  Yes, it seems to be.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Bootstrap failure on hppa-unknown-linux-gnu, trunk

[Josef Zlomek]

> > stage1/xgcc -Bstage1/ -B/home/dave/opt/gnu/hppa-linux/bin/ -c   -g -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long -fno-common -Werror   -DHAVE_CONFIG_H    -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/config -I../../gcc/gcc/../include
> > ../../gcc/gcc/bb-reorder.c -o bb-reorder.o
> > ../../gcc/gcc/bb-reorder.c: In function `find_traces':
> > ../../gcc/gcc/bb-reorder.c:219: error: unrecognizable insn:
> > (insn 776 775 777 0x40568f60 (set (reg:DI 70 %fr23 [252])
> > 	(mult:DI (zero_extend:DI (reg:SI 69 %fr22R [246]))
> > 	    (reg:DI 74 %fr25))) -1 (nil)
> >    (expr_list:REG_UNUSED (reg:SI 71 %fr23R)
> > 	(expr_list:REG_DEAD (reg:DI 74 %fr25)
> > 	    (nil))))
> > ../../gcc/gcc/bb-reorder.c:219: internal compiler error: in num_delay_slots, at insn-attrtab.c:4085
> 
> I have determined that it is the addition of this patch that results in
> the above ICE:

Maybe it is a similar problem in machine descriptions as alpha and sh did
have (http://gcc.gnu.org/ml/gcc-patches/2003-02/msg01295.html). But maybe I'm wrong.
The bb-reorder itself is pretty high level, it is a probably first use
of code duplication functions which went to mainline.
Anyway, I apologize for the breakage.

Josef

> 2003-02-10  Josef Zlomek  <zlomekj@suse.cz>
> 
> 	* Makefile.in (bb-reorder.o): Add dependency on $(FIBHEAP_H).
> 	* bb-reorder.c (make_reorder_chain): Deleted.
> 	(make_reorder_chain_1): Deleted.
> 	(find_traces): New function.
> 	(rotate_loop): New function.
> 	(mark_bb_visited): New function.
> 	(find_traces_1_round): New function.
> 	(copy_bb): New function.
> 	(bb_to_key): New function.
> 	(better_edge_p): New function.
> 	(connect_traces): New function.
> 	(copy_bb_p): New function.
> 	(get_uncond_jump_length): New function.
> 	(reorder_basic_blocks): Use new functions (Software Trace Cache).
> 	* cfgcleanup.c (outgoing_edges_match): Enable crossjumping across loop
> 	boundaries.

Re: Bootstrap failure on hppa-unknown-linux-gnu, trunk

[Josef Zlomek]

> > > stage1/xgcc -Bstage1/ -B/home/dave/opt/gnu/hppa-linux/bin/ -c   -g -O2 -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -Wtraditional -pedantic -Wno-long-long -fno-common -Werror   -DHAVE_CONFIG_H    -I. -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/config -I../../gcc/gcc/../include
> > > ../../gcc/gcc/bb-reorder.c -o bb-reorder.o
> > > ../../gcc/gcc/bb-reorder.c: In function `find_traces':
> > > ../../gcc/gcc/bb-reorder.c:219: error: unrecognizable insn:
> > > (insn 776 775 777 0x40568f60 (set (reg:DI 70 %fr23 [252])
> > > 	(mult:DI (zero_extend:DI (reg:SI 69 %fr22R [246]))
> > > 	    (reg:DI 74 %fr25))) -1 (nil)
> > >    (expr_list:REG_UNUSED (reg:SI 71 %fr23R)
> > > 	(expr_list:REG_DEAD (reg:DI 74 %fr25)
> > > 	    (nil))))
> > > ../../gcc/gcc/bb-reorder.c:219: internal compiler error: in num_delay_slots, at insn-attrtab.c:4085
> > 
> > I have determined that it is the addition of this patch that results in
> > the above ICE:
> 
> Maybe it is a similar problem in machine descriptions as alpha and sh did
> have (http://gcc.gnu.org/ml/gcc-patches/2003-02/msg01295.html). But maybe I'm wrong.
> The bb-reorder itself is pretty high level, it is a probably first use
> of code duplication functions which went to mainline.
> Anyway, I apologize for the breakage.

Or there simply is some code in bb-reorder.c which uncovers another bug.

Josef

Re: Altivec + 16 byte alignment

[John David Anglin]

>       /* Ignore alignment we can't do with expected alignment of the
>          boundary.  */
>       if (alignment * BITS_PER_UNIT > PREFERRED_STACK_BOUNDARY)
> 	alignment = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT;
> 			 
>     but really that's wrong, and at a minimum it should warn the user
>     that their requested alignment isn't going to happen (better would be
>     to just ensure the requested alignment).  We occasionally get bug
>     reports about this, but so far no-one has invested the effort to
>     implement arbitrary stack alignment.
> 
> Now we have *yet another* macro involved in alignment!

Another issue is GCC's alignment attribute is silently ignored for stack
locals and the documentation doesn't say that.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: Altivec + 16 byte alignment

[Mike Stump]

On Tuesday, February 11, 2003, at 11:59 AM, John David Anglin wrote:
>>       /* Ignore alignment we can't do with expected alignment of the
>>          boundary.  */
>>       if (alignment * BITS_PER_UNIT > PREFERRED_STACK_BOUNDARY)
>> 	alignment = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT;
>> 			
>>     but really that's wrong, and at a minimum it should warn the user
>>     that their requested alignment isn't going to happen (better 
>> would be
>>     to just ensure the requested alignment).  We occasionally get bug
>>     reports about this, but so far no-one has invested the effort to
>>     implement arbitrary stack alignment.
>>
>> Now we have *yet another* macro involved in alignment!
>
> Another issue is GCC's alignment attribute is silently ignored for 
> stack
> locals and the documentation doesn't say that.

Let us agree that this is just a bug, or at least a bug for CPUs that 
have hard requirements of say 16 bytes (Altivec, SSE) and the user asks 
for 16 byte alignment and we silently only do 8 byte alignment.

Re: Altivec + 16 byte alignment

[Fergus Henderson]

On 11-Feb-2003, Mike Stump <mstump@apple.com> wrote:
> On Tuesday, February 11, 2003, at 11:59 AM, John David Anglin wrote:
> > Another issue is GCC's alignment attribute is silently ignored for 
> > stack locals and the documentation doesn't say that.
> 
> Let us agree that this is just a bug, or at least a bug for CPUs that 
> have hard requirements of say 16 bytes (Altivec, SSE) and the user asks 
> for 16 byte alignment and we silently only do 8 byte alignment.

Please let us agree that this is just a bug, regardless of the CPU's
requirements.  The alignment declaration might be used by the programmer
to ensure that the lower bits are available for use as tag bits.

For example, the following program should result in either success
or a compile error (if the requested alignment is not supported).
But IMHO it should not result in an assertion failure.

	#include <assert.h>
	#define ALIGN 32
	int main() {
		char c __attribute__((aligned(ALIGN)));
		assert ((((unsigned long) &c) & (ALIGN - 1)) == 0);
		return 0;
	}

-- 
Fergus Henderson <fjh@cs.mu.oz.au>  |  "I have always known that the pursuit
The University of Melbourne         |  of excellence is a lethal habit"
WWW: <http://www.cs.mu.oz.au/~fjh>  |     -- the last words of T. S. Garp.

Re: Altivec + 16 byte alignment

[John David Anglin]

> Please let us agree that this is just a bug, regardless of the CPU's
> requirements.  The alignment declaration might be used by the programmer
> to ensure that the lower bits are available for use as tag bits.
> 
> For example, the following program should result in either success
> or a compile error (if the requested alignment is not supported).
> But IMHO it should not result in an assertion failure.
> 
> 	#include <assert.h>
> 	#define ALIGN 32
> 	int main() {
> 		char c __attribute__((aligned(ALIGN)));
> 		assert ((((unsigned long) &c) & (ALIGN - 1)) == 0);
> 		return 0;
> 	}

You have my vote on the matter.

If we go back to Franz's original reply to my post regarding the
rs6000 port, he said "BIGGEST_ALIGNMENT is 128, but STACK_BOUNDARY
is 64 unless you give -mabi=altivec (in 3.2+)."   If you look at
assign_stack_temp_for_type and assign_stack_local_1, you will see
that BLKmode objects are aligned to BIGGEST_ALIGNMENT.  Thus, without
-mabi=altivec, you would randomly get an assertion failure, depending
on the stack alignment, if you checked the alignment of structs with
code similar to that above.  In other words, you aren't getting the
alignment of BLKmode stack locals that you have specified in the
backend.  Possibly, this doesn't matter, but it seems inconsistent
and I think would lead to problems if the compiler checked alignment
requests as suggested above.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: GCC 3.3 Prelease broken on s390

[Ulrich Weigand]

I wrote:

> Interestingly, mainline works fine without any patch.

When your latest mainline patch to unwind-dw2.c is backported 
to 3.3, it works again as well; the patch below does this.

(A full bootstrap/regtest is still running.)

Note that I really only need the first hunk, as the
rest only changes the return value from uw_install_context_1,
which is completely ignored on s390 anyway (as SP is
restored from its stack slot, where the correct new
value was already stored by uw_install_context_1).

What do you think?

Bye,
Ulrich

ChangeLog:

        * unwind-dw2.c (uw_update_context_1): Only set cfa as sp if
        previous frame didn't save sp.  Clear sp for next frame.
        (uw_install_context_1): Honor saved sp from frame.


*** unwind-dw2.c.orig	Wed May  7 02:52:49 2003
--- unwind-dw2.c	Wed May  7 03:00:45 2003
*************** uw_update_context_1 (struct _Unwind_Cont
*** 1059,1069 ****
       In very special situations (such as unwind info for signal return),
       there may be location expressions that use the stack pointer as well.
  
!      Given that other unwind mechanisms generally won't work if you try
!      to represent stack pointer saves and restores directly, we don't
!      bother conditionalizing this at all.  */
!   tmp_sp = (_Unwind_Ptr) context->cfa;
!   orig_context.reg[__builtin_dwarf_sp_column ()] = &tmp_sp;
  
    /* Compute this frame's CFA.  */
    switch (fs->cfa_how)
--- 1059,1075 ----
       In very special situations (such as unwind info for signal return),
       there may be location expressions that use the stack pointer as well.
  
!      Do this conditionally for one frame.  This allows the unwind info
!      for one frame to save a copy of the stack pointer from the previous
!      frame, and be able to use much easier CFA mechanisms to do it.
!      Always zap the saved stack pointer value for the next frame; carrying
!      the value over from one frame to another doesn't make sense.  */
!   if (!orig_context.reg[__builtin_dwarf_sp_column ()])
!     {
!       tmp_sp = (_Unwind_Ptr) context->cfa;
!       orig_context.reg[__builtin_dwarf_sp_column ()] = &tmp_sp;
!     }
!   context->reg[__builtin_dwarf_sp_column ()] = NULL;
  
    /* Compute this frame's CFA.  */
    switch (fs->cfa_how)
*************** uw_install_context_1 (struct _Unwind_Con
*** 1201,1206 ****
--- 1207,1213 ----
  		      struct _Unwind_Context *target)
  {
    long i;
+   void *target_cfa;
  
  #if __GTHREADS
    {
*************** uw_install_context_1 (struct _Unwind_Con
*** 1222,1232 ****
  	memcpy (c, t, dwarf_reg_size_table[i]);
      }
  
    /* We adjust SP by the difference between CURRENT and TARGET's CFA.  */
    if (STACK_GROWS_DOWNWARD)
!     return target->cfa - current->cfa + target->args_size;
    else
!     return current->cfa - target->cfa - target->args_size;
  }
  
  static inline _Unwind_Ptr
--- 1229,1246 ----
  	memcpy (c, t, dwarf_reg_size_table[i]);
      }
  
+   /* If the last frame records a saved stack pointer, use it.  */
+   if (target->reg[__builtin_dwarf_sp_column ()])
+     target_cfa = (void *)(_Unwind_Ptr)
+       _Unwind_GetGR (target, __builtin_dwarf_sp_column ());
+   else
+     target_cfa = target->cfa;
+ 
    /* We adjust SP by the difference between CURRENT and TARGET's CFA.  */
    if (STACK_GROWS_DOWNWARD)
!     return target_cfa - current->cfa + target->args_size;
    else
!     return current->cfa - target_cfa - target->args_size;
  }
  
  static inline _Unwind_Ptr

-- 
  Dr. Ulrich Weigand
  weigand@informatik.uni-erlangen.de

Re: GCC 3.3 Prelease broken on s390

[Richard Henderson]

On Wed, May 07, 2003 at 03:13:39AM +0200, Ulrich Weigand wrote:
> ... which is completely ignored on s390 anyway (as SP is
> restored from its stack slot, where the correct new
> value was already stored by uw_install_context_1).

Ah, now I get it.  This was the piece I couldn't understand.
And if *this* is the case, it means that it doesn't matter
where you place the CFA relative to the stack frame, just so
long as the stack pointer itself is computed properly.

> What do you think?
> 
>         * unwind-dw2.c (uw_update_context_1): Only set cfa as sp if
>         previous frame didn't save sp.  Clear sp for next frame.
>         (uw_install_context_1): Honor saved sp from frame.

If this works, great.


r~

Re: GCC 3.3 Prelease broken on s390

[Mark Mitchell]

> > What do you think?
> > 
> >         * unwind-dw2.c (uw_update_context_1): Only set cfa as sp if
> >         previous frame didn't save sp.  Clear sp for next frame.
> >         (uw_install_context_1): Honor saved sp from frame.
> 
> If this works, great.

Ulrich --

Take that as approval from Richard; if it fixes your problem, please
check it in and close the PR.

Thanks,

-- 
Mark Mitchell <mark@codesourcery.com>
CodeSourcery, LLC

Re: GCC 3.3 Prelease broken on s390

[Ulrich Weigand]

Richard Henderson wrote:

> Ah, now I get it.  This was the piece I couldn't understand.
> And if *this* is the case, it means that it doesn't matter
> where you place the CFA relative to the stack frame, just so
> long as the stack pointer itself is computed properly.

This is what I was thinking, yes.

> >         * unwind-dw2.c (uw_update_context_1): Only set cfa as sp if
> >         previous frame didn't save sp.  Clear sp for next frame.
> >         (uw_install_context_1): Honor saved sp from frame.
> 
> If this works, great.

Unfortunately, while it fixes most of the problems, it is not a
complete solution:
http://gcc.gnu.org/ml/gcc-testresults/2003-05/msg00418.html
http://gcc.gnu.org/ml/gcc-testresults/2003-05/msg00419.html

The Java test case PR218 is still failing.  This is because
this test case throws an exception from a signal handler
through a *leaf* function that was interrupted by the
signal.

When unwinding through the leaf function, there is no CFA code
to restore the stack pointer, because the *correct* behaviour
would have been to reuse the stack pointer from the frame below
(the signal return stub frame) unchanged -- the leaf function
really did not allocate any stack space.

However, this now triggers again the new code that sets the
stack pointer to the cfa, incorrect on s390.

Would you suggest to check the above patch in anyway to make 3.3
more similar to head (apparently the patch is already in 3.2 ...),
and because it fixes at least C++?

Or should we go back to a RUNTIME_SP_CFA_OFFSET solution
on top of the current 3.3 implementation?

What about an alternate target macro that says that this target
handles SP by itself via FDE records, and doesn't need any
other SP fiddling?  This would then allow us to remove the 
unnecessary EH_RETURN_STACKADJ_RTX handling completely.
Maybe this behaviour could actually be triggered by the target
leaving EH_RETURN_STACKADJ_RTX undefined?

If no other solution works for 3.3, we could always fix it
ad-hoc with #ifdef __s390__ ...

Bye,
Ulrich

-- 
  Dr. Ulrich Weigand
  weigand@informatik.uni-erlangen.de

Re: GCC 3.3 Prelease broken on s390

[Mark Mitchell]

> Unfortunately, while it fixes most of the problems, it is not a
> complete solution:

Bummer.

> Would you suggest to check the above patch in anyway to make 3.3
> more similar to head (apparently the patch is already in 3.2 ...),
> and because it fixes at least C++?

No, that doesn't seem worth it.

> Or should we go back to a RUNTIME_SP_CFA_OFFSET solution
> on top of the current 3.3 implementation?

That seems fine, if it will work.  The key criteria are:

(1) You can do it in such a way that it's obvious it doesn't affect
other platforms.

(2) You can do it quickly.

Engineering beauty is not a consideration at all, in this case.  

#ifdef __s390__ is fine, for example; if you can just do 

  #ifdef __s390__ 
  cfa += 196;
  #endif

that is absolutely fine by me.

If we can't meet those criteria, we may be forced to punt; s390 is not a
primary evaluation platform.  

Please see if you can get this fixed in the next twenty-four hours or
so.

Thanks,

-- 
Mark Mitchell <mark@codesourcery.com>
CodeSourcery, LLC

Re: GCC 3.3 Prelease broken on s390

[Joe Buck]

On Wed, May 07, 2003 at 08:53:40AM -0700, Mark Mitchell wrote:
> Engineering beauty is not a consideration at all, in this case.  
> 
> #ifdef __s390__ is fine, for example; if you can just do 
> 
>   #ifdef __s390__ 
>   cfa += 196;
>   #endif
> 
> that is absolutely fine by me.

If we go for such a solution, I think that it should be a one-release-only
emergency fix, to be replaced ASAP with a better one; seas of #ifdef's
tend to grow if not whacked back.

Re: GCC 3.3 Prelease broken on s390

[Mark Mitchell]

On Wed, 2003-05-07 at 09:01, Joe Buck wrote:
> On Wed, May 07, 2003 at 08:53:40AM -0700, Mark Mitchell wrote:
> > Engineering beauty is not a consideration at all, in this case.  
> > 
> > #ifdef __s390__ is fine, for example; if you can just do 
> > 
> >   #ifdef __s390__ 
> >   cfa += 196;
> >   #endif
> > 
> > that is absolutely fine by me.
> 
> If we go for such a solution, I think that it should be a one-release-only
> emergency fix, to be replaced ASAP with a better one; seas of #ifdef's
> tend to grow if not whacked back.

There's no way something like this will go on the mainline.

If we had to live with this through the 3.3 series, that would be OK;
that is bounded.

-- 
Mark Mitchell <mark@codesourcery.com>
CodeSourcery, LLC

Re: GCC 3.3 Prelease broken on s390

[Ulrich Weigand]

Mark Mitchell wrote:

> That seems fine, if it will work.  The key criteria are:
> 
> (1) You can do it in such a way that it's obvious it doesn't affect
> other platforms.
> 
> (2) You can do it quickly.
> 
> Engineering beauty is not a consideration at all, in this case.  

I can offer the following patch, which passes bootstrap/regtest
on s390-ibm-linux and s390x-ibm-linux and restores both targets
to their previous behaviour in all cases, including that Java
leaf-function test case.  See:
http://gcc.gnu.org/ml/gcc-testresults/2003-05/msg00428.html
http://gcc.gnu.org/ml/gcc-testresults/2003-05/msg00429.html


It should be obvious that it does not affect other platforms;
the hunk in uw_update_context_1 is under #ifdef, and the hunk
in uw_init_context_1 does not affect non-s390 platforms because
for them uw_update_context_1 will immediately undo that change
(never mind that even if it didn't, the change would in fact
be correct for other platforms as well).

I will continue to work on a cleaner solution, but I cannot
guarantee that this will succeed within 24 hours (and I'd
also like to ask for Richard's opinion).  

Do you think we should use the patch below for 3.3?

Bye,
Ulrich


	PR other/10650
	* unwind-dw2.c (uw_update_context_1): Don't set sp as cfa on s390.
	(uw_init_context_1): Set initial sp to outer cfa.

Index: gcc/unwind-dw2.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/unwind-dw2.c,v
retrieving revision 1.22.2.4
diff -c -p -r1.22.2.4 unwind-dw2.c
*** gcc/unwind-dw2.c	5 May 2003 16:59:21 -0000	1.22.2.4
--- gcc/unwind-dw2.c	7 May 2003 14:54:10 -0000
*************** uw_update_context_1 (struct _Unwind_Cont
*** 1062,1069 ****
--- 1062,1071 ----
       Given that other unwind mechanisms generally won't work if you try
       to represent stack pointer saves and restores directly, we don't
       bother conditionalizing this at all.  */
+ #ifndef __s390__
    tmp_sp = (_Unwind_Ptr) context->cfa;
    orig_context.reg[__builtin_dwarf_sp_column ()] = &tmp_sp;
+ #endif
  
    /* Compute this frame's CFA.  */
    switch (fs->cfa_how)
*************** uw_init_context_1 (struct _Unwind_Contex
*** 1164,1169 ****
--- 1166,1172 ----
  
    /* Force the frame state to use the known cfa value.  */
    context->cfa = outer_cfa;
+   context->reg[__builtin_dwarf_sp_column ()] = &outer_cfa;
    fs.cfa_how = CFA_REG_OFFSET;
    fs.cfa_reg = __builtin_dwarf_sp_column ();
    fs.cfa_offset = 0;


-- 
  Dr. Ulrich Weigand
  weigand@informatik.uni-erlangen.de

Re: GCC 3.3 Prelease broken on s390

[Joe Buck]

On Wed, May 07, 2003 at 07:02:49PM +0200, Ulrich Weigand wrote:
> It should be obvious that it does not affect other platforms;
> the hunk in uw_update_context_1 is under #ifdef, and the hunk
> in uw_init_context_1 does not affect non-s390 platforms because
> for them uw_update_context_1 will immediately undo that change
> (never mind that even if it didn't, the change would in fact
> be correct for other platforms as well).

Given the very short time remaining for testing, if you're ifdef'ing
one hunk, you might as well ifdef them both.  The patch would then
have zero risk for other platforms.
 

Re: GCC 3.3 Prelease broken on s390

[Mark Mitchell]

> I will continue to work on a cleaner solution, but I cannot
> guarantee that this will succeed within 24 hours (and I'd
> also like to ask for Richard's opinion).  
> 
> Do you think we should use the patch below for 3.3?

Yes -- but please enclose the second hunk in #ifdef as well.  If we're
going to be ugly, let's not try to be smart while we're being ugly.

Please check this in, and close the PR.

Thanks,

-- 
Mark Mitchell <mark@codesourcery.com>
CodeSourcery, LLC

Re: GCC 3.3 Prelease broken on s390

[Ulrich Weigand]

Mark Mitchell wrote:

> Yes -- but please enclose the second hunk in #ifdef as well.  If we're
> going to be ugly, let's not try to be smart while we're being ugly.

Fine with me.

> Please check this in, and close the PR.

For the record, I've checked in the patch below and closed the PR.

Bye,
Ulrich


Index: gcc/ChangeLog
===================================================================
RCS file: /cvs/gcc/gcc/gcc/ChangeLog,v
retrieving revision 1.16114.2.511
diff -c -p -r1.16114.2.511 ChangeLog
*** gcc/ChangeLog	7 May 2003 06:02:01 -0000	1.16114.2.511
--- gcc/ChangeLog	7 May 2003 19:26:21 -0000
***************
*** 1,3 ****
--- 1,9 ----
+ 2003-05-06  Ulrich Weigand  <uweigand@de.ibm.com>
+ 
+ 	PR other/10650
+ 	* unwind-dw2.c (uw_update_context_1): Don't set sp as cfa on s390.
+ 	(uw_init_context_1): Set initial sp to outer cfa on s390.
+ 
  2003-05-06  Mark Mitchell  <mark@codesourcery.com>
  
  	PR other/10658
Index: gcc/unwind-dw2.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/unwind-dw2.c,v
retrieving revision 1.22.2.4
diff -c -p -r1.22.2.4 unwind-dw2.c
*** gcc/unwind-dw2.c	5 May 2003 16:59:21 -0000	1.22.2.4
--- gcc/unwind-dw2.c	7 May 2003 19:26:21 -0000
*************** uw_update_context_1 (struct _Unwind_Cont
*** 1062,1069 ****
--- 1062,1071 ----
       Given that other unwind mechanisms generally won't work if you try
       to represent stack pointer saves and restores directly, we don't
       bother conditionalizing this at all.  */
+ #ifndef __s390__
    tmp_sp = (_Unwind_Ptr) context->cfa;
    orig_context.reg[__builtin_dwarf_sp_column ()] = &tmp_sp;
+ #endif
  
    /* Compute this frame's CFA.  */
    switch (fs->cfa_how)
*************** uw_init_context_1 (struct _Unwind_Contex
*** 1164,1169 ****
--- 1166,1174 ----
  
    /* Force the frame state to use the known cfa value.  */
    context->cfa = outer_cfa;
+ #ifdef __s390__
+   context->reg[__builtin_dwarf_sp_column ()] = &outer_cfa;
+ #endif
    fs.cfa_how = CFA_REG_OFFSET;
    fs.cfa_reg = __builtin_dwarf_sp_column ();
    fs.cfa_offset = 0;


-- 
  Dr. Ulrich Weigand
  weigand@informatik.uni-erlangen.de

Re: GCC 3.3 Prelease broken on s390

[Mark Mitchell]

On Wed, 2003-05-07 at 12:39, Ulrich Weigand wrote:
> Mark Mitchell wrote:
> 
> > Yes -- but please enclose the second hunk in #ifdef as well.  If we're
> > going to be ugly, let's not try to be smart while we're being ugly.
> 
> Fine with me.
> 
> > Please check this in, and close the PR.
> 
> For the record, I've checked in the patch below and closed the PR.

Thanks!

-- 
Mark Mitchell
CodeSourcery, LLC
mark@codesourcery.com

Re: GCC 3.3 Prelease broken on s390

[Jonathan Lennox]

Ulrich Weigand writes:
> + #ifndef __s390__
>     tmp_sp = (_Unwind_Ptr) context->cfa;
>     orig_context.reg[__builtin_dwarf_sp_column ()] = &tmp_sp;
> + #endif

Doesn't __s390__ indicate the build system, not the target?

-- 
Jonathan Lennox
lennox@cs.columbia.edu

Re: GCC 3.3 Prelease broken on s390

[Mark Mitchell]

On Wed, 2003-05-07 at 11:19, Jonathan Lennox wrote:
> Ulrich Weigand writes:
> > + #ifndef __s390__
> >     tmp_sp = (_Unwind_Ptr) context->cfa;
> >     orig_context.reg[__builtin_dwarf_sp_column ()] = &tmp_sp;
> > + #endif
> 
> Doesn't __s390__ indicate the build system, not the target?

Yes, but this code is built with the new GCC, so I think that will work
our correctly.

-- 
Mark Mitchell <mark@codesourcery.com>
CodeSourcery, LLC

Re: GCC 3.3 Prelease broken on s390

[Jonathan Lennox]

On , May 7 2003, "Mark Mitchell" wrote to "Jonathan Lennox, Ulrich Weigand, rth@redhat.com, gcc@gcc.gnu.org" saying:

> On Wed, 2003-05-07 at 11:19, Jonathan Lennox wrote:
> > Doesn't __s390__ indicate the build system, not the target?
> 
> Yes, but this code is built with the new GCC, so I think that will work
> our correctly.

What about cross-compilers to s390, or built on it?

("They don't work" is a fine answer.) 

-- 
Jonathan Lennox
lennox@cs.columbia.edu

Re: GCC 3.3 Prelease broken on s390

[Mark Mitchell]

On Wed, 2003-05-07 at 11:30, Jonathan Lennox wrote:
> On , May 7 2003, "Mark Mitchell" wrote to "Jonathan Lennox, Ulrich Weigand, rth@redhat.com, gcc@gcc.gnu.org" saying:
> 
> > On Wed, 2003-05-07 at 11:19, Jonathan Lennox wrote:
> > > Doesn't __s390__ indicate the build system, not the target?
> > 
> > Yes, but this code is built with the new GCC, so I think that will work
> > our correctly.
> 
> What about cross-compilers to s390, or built on it?

They will set __s390__ if they are cross compilers to __s390__, and will
not set it if they are not, so all will be well.

And, in fact, even were this broken it would not be too bad -- it's not
like s390 is one of our most-used platforms.  The goal here is to get a
minimally intrusive patch that makes it possible for s390 people to use
GCC 3.3.

-- 
Mark Mitchell
CodeSourcery, LLC
mark@codesourcery.com

Re: GCC 3.3 Prelease broken on s390

[Daniel Jacobowitz]

On Wed, May 07, 2003 at 02:30:23PM -0400, Jonathan Lennox wrote:
> On , May 7 2003, "Mark Mitchell" wrote to "Jonathan Lennox, Ulrich Weigand, rth@redhat.com, gcc@gcc.gnu.org" saying:
> 
> > On Wed, 2003-05-07 at 11:19, Jonathan Lennox wrote:
> > > Doesn't __s390__ indicate the build system, not the target?
> > 
> > Yes, but this code is built with the new GCC, so I think that will work
> > our correctly.
> 
> What about cross-compilers to s390, or built on it?
> 
> ("They don't work" is a fine answer.) 

This code is built for the target, not for the build machine.  Checking
__s390__ should be correct.  (It's part of libgcc)

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer

Re: GCC 3.3 Prelease broken on s390

[Richard Henderson]

On Wed, May 07, 2003 at 04:49:12PM +0200, Ulrich Weigand wrote:
> However, this now triggers again the new code that sets the
> stack pointer to the cfa, incorrect on s390.

If I understand correctly, then this would be fixed by

  + #ifndef __s390__
      _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), NULL);
  + #endif

correct?

> Would you suggest to check the above patch in anyway to make 3.3
> more similar to head (apparently the patch is already in 3.2 ...),
> and because it fixes at least C++?

Well, not to make it more similar to head, but because it gets
more cases demonstrably correct.  On s390 and elsewhere.


r~

Re: GCC 3.3 Prelease broken on s390

[Ulrich Weigand]

Richard Henderson wrote:

> If I understand correctly, then this would be fixed by
> 
>   + #ifndef __s390__
>       _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), NULL);
>   + #endif
> 
> correct?

Basically yes, except that then the initial cfa is no longer
found when called from uw_init_context_1.  This is fixed by the 
second hunk of the patch I just committed ...

> > Would you suggest to check the above patch in anyway to make 3.3
> > more similar to head (apparently the patch is already in 3.2 ...),
> > and because it fixes at least C++?
> 
> Well, not to make it more similar to head, but because it gets
> more cases demonstrably correct.  On s390 and elsewhere.

We should certainly fix it properly on the head and for 3.3.1.
Whether this is something for 3.3 I have no strong opinion on
-- that's Mark's call ...

Bye,
Ulrich

-- 
  Dr. Ulrich Weigand
  weigand@informatik.uni-erlangen.de

Re: GCC 3.3 Prelease broken on s390

[Mark Mitchell]

> We should certainly fix it properly on the head and for 3.3.1.
> Whether this is something for 3.3 I have no strong opinion on
> -- that's Mark's call ...

For 3.3, we certainly don't want anything we don't absolutely need.

Thanks,

-- 
Mark Mitchell
CodeSourcery, LLC
mark@codesourcery.com

Re: Solaris 8/SPARC bootstrap broken building 64-bit libgcc

[John David Anglin]

> I have seen the same error but in a different place for the past two days:
> 
> stage1/xgcc -Bstage1/ -B/home/dave/opt/gnu/hppa-linux/bin/ -c   -gstabs -O2 -DIN
> _GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedant
> ic -Wno-long-long -Werror -fno-common   -DHAVE_CONFIG_H -DGENERATOR_FILE    -I.
> -I. -I../../gcc/gcc -I../../gcc/gcc/. -I../../gcc/gcc/config -I../../gcc/gcc/../
> include -I../intl ../../gcc/gcc/genautomata.c -o genautomata.o
> ../../gcc/gcc/genautomata.c: In function `automata_list_eq_p':
> ../../gcc/gcc/genautomata.c:4463: error: head insn 90 for block 0 not found in t
> he insn stream
> ../../gcc/gcc/genautomata.c:4463: internal compiler error: Segmentation fault

Zdenek's patch

  http://gcc.gnu.org/ml/gcc-patches/2003-07/msg00457.html

fixed the above failure.  However, there are still a bunch of new segmentation
faults in the testsuite.  For example,

Executing on host: /home/dave/gcc-3.4/objdir/gcc/xgcc -B/home/dave/gcc-3.4/objdi
r/gcc/   -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions  -w -c
-o 20000728-1.o /home/dave/gcc-3.4/gcc/gcc/testsuite/gcc.c-torture/compile/20000
728-1.c    (timeout = 300)
/home/dave/gcc-3.4/gcc/gcc/testsuite/gcc.c-torture/compile/20000728-1.c: In func
tion `foo':
/home/dave/gcc-3.4/gcc/gcc/testsuite/gcc.c-torture/compile/20000728-1.c:15: inte
rnal compiler error: Segmentation fault

The stack backtrace is:

#0  0x000ec654 in verify_dominators (dom=0x486f58)
    at ../../gcc/gcc/dominance.c:695
#1  0x002f4bcc in unroll_and_peel_loops (loops=0x486e48, flags=4739680)
    at ../../gcc/gcc/loop-unroll.c:145
#2  0x0029b614 in rest_of_handle_loop2 (decl=0x486e48, insns=0x401d1ba0)
    at ../../gcc/gcc/toplev.c:3303
#3  0x0029bda4 in rest_of_compilation (decl=0x401d0a80)
    at ../../gcc/gcc/toplev.c:3576
#4  0x0003e438 in c_expand_body_1 (fndecl=0x401d0a80, nested_p=0)
    at ../../gcc/gcc/c-decl.c:6379
#5  0x002d4500 in cgraph_expand_function (node=0x40017340)
    at ../../gcc/gcc/cgraphunit.c:282
#6  0x002d46c8 in cgraph_expand_functions () at ../../gcc/gcc/cgraphunit.c:372
#7  0x002d49d0 in cgraph_optimize () at ../../gcc/gcc/cgraphunit.c:462
#8  0x0007dfe0 in c_objc_common_finish_file ()
    at ../../gcc/gcc/c-objc-common.c:363
#9  0x00019d3c in yyparse () at c-parse.y:339
#10 0x0006f398 in c_common_parse_file (set_yydebug=4732136)
    at ../../gcc/gcc/c-opts.c:1188
#11 0x00298e20 in compile_file () at ../../gcc/gcc/toplev.c:2069
#12 0x0029e3d0 in do_compile () at ../../gcc/gcc/toplev.c:4959
#13 0x0029e44c in toplev_main (argc=18, argv=0xfaf005b0)
    at ../../gcc/gcc/toplev.c:4990

It appears dom_bb is 0x0.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)

Re: Someone broke bootstrap

[John David Anglin]

> There are also a bunch of testsuite regressions on hppa64-hp-hpux11.11.

See <http://gcc.gnu.org/ml/gcc-testresults/2003-10/msg00324.html>.

The gcc.log has messages similar to the following for the new regressions:

/xxx/gnu/gcc-3.3/gcc/gcc/testsuite/gcc.dg/compat/scalar-by-value-1_x.c:154: inte
rnal compiler error: in copy_rtx, at rtl.c:377
Please submit a full bug report,

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)

Re: Someone broke bootstrap

[Eric Christopher]

On Tue, 2003-10-07 at 20:11, John David Anglin wrote:
> > There are also a bunch of testsuite regressions on hppa64-hp-hpux11.11.
> 
> See <http://gcc.gnu.org/ml/gcc-testresults/2003-10/msg00324.html>.
> 
> The gcc.log has messages similar to the following for the new regressions:
> 
> /xxx/gnu/gcc-3.3/gcc/gcc/testsuite/gcc.dg/compat/scalar-by-value-1_x.c:154: inte
> rnal compiler error: in copy_rtx, at rtl.c:377
> Please submit a full bug report,

I'm seeing this on frv too. I blame Zack (at least in the little bit of
looking I did...), but that's ok. I'm sure he'll fix it.

-eric

-- 
Eric Christopher <echristo@redhat.com>

Re: Someone broke bootstrap

[John David Anglin]

> I'm seeing this on frv too. I blame Zack (at least in the little bit of
> looking I did...), but that's ok. I'm sure he'll fix it.

Yes, it looks as if this is caused by one of Zack's recent changes.
We have:

#0  0x400000000035ee3c in copy_rtx (orig=0x0) at ../../gcc/gcc/rtl.c:377
#1  0x40000000002f869c in emit_libcall_block (insns=0x800003fffed1f550, 
    target=0x800003fffed20600, result=0x800003fffed1f2d0, equiv=0x0)
    at ../../gcc/gcc/optabs.c:3397
#2  0x40000000002f9430 in emit_cmp_and_jump_insns (x=0x800003fffed3bfa0, 
    y=0x800003fffeff2768, comparison=NE, size=0x72, mode=TFmode, unsignedp=0, 
    label=0x800003fffed3bf50) at ../../gcc/gcc/optabs.c:3946

emit_libcall_block is called with equiv=0 when optimize is 0.  We end
up trying to copy a NULL_RTX at optabs.c:3397.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)

Re: autoconf changes break bootstrap on hppa*-*-hpux*

[John David Anglin]

> > So how, precisely is config.cache "not found"?  Is it deleted between line
> > 489 and line 491?  Or is your shell busted?

> The PATH environment variable isn't set correctly.

Possibly, I should add that /bin/sh under hpux 11 is the POSIX shell
and supposedly conforms to the POSIX standards in effect at the time
hpux 11 was introduced.  This means that the source command doesn't
search the current directory.  If I add `.' to PATH, then config.cache
is found.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)

Re: Call to arms: testsuite failures on various targets

[John David Anglin]

> * hppa64-hp-hpux11.11: many failures

Most of these are "Type/rank mismatch in argument":

FAIL: gfortran.dg/assumed_charlen_function_5.f90  -O  (test for excess errors)
Excess errors:
/test/gnu/gcc/gcc/gcc/testsuite/gfortran.dg/assumed_charlen_function_5.f90:22: E
rror: Type/rank mismatch in argument 'charr' at (1)
/test/gnu/gcc/gcc/gcc/testsuite/gfortran.dg/assumed_charlen_function_5.f90:23: E
rror: Type/rank mismatch in argument 'charr' at (1)

In gfortran.dg/entry_1.f90:

Excess errors:
/test/gnu/gcc/gcc/gcc/testsuite/gfortran.dg/entry_1.f90:15: Error: Type/rank mis
match in argument 'p' at (1)
/test/gnu/gcc/gcc/gcc/testsuite/gfortran.dg/entry_1.f90:16: Error: Type/rank mis
match in argument 'p' at (1)
/test/gnu/gcc/gcc/gcc/testsuite/gfortran.dg/entry_1.f90:40: Fatal Error: Can't o
pen module file 'm.mod' for reading at (1): No such file or directory

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)

Re: gcc 3.2's cpp breaks configure scripts

[John David Anglin]

Jeff,

> cpp is spitting out a warning about changing the search order of include
> directories, and this is breaking a _ton_ of configure scripts. I found
> this when I started rebuilding Mandrake with gcc-3.2 branch.

You might try the patch below and see if it fixes your problem.  It is a
variant for gcc-3.2 branch of the patch proposed in this message for the
main: < http://gcc.gnu.org/ml/gcc-patches/2002-08/msg00708.html >.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Index: cppinit.c
===================================================================
RCS file: /cvsroot/gcc/gcc/gcc/cppinit.c,v
retrieving revision 1.202.2.5
diff -u -3 -p -r1.202.2.5 cppinit.c
--- cppinit.c	24 May 2002 09:26:48 -0000	1.202.2.5
+++ cppinit.c	10 Aug 2002 04:27:07 -0000
@@ -103,9 +103,13 @@ static void mark_named_operators	PARAMS 
 static void append_include_chain	PARAMS ((cpp_reader *,
 						 char *, int, int));
 static struct search_path * remove_dup_dir	PARAMS ((cpp_reader *,
+						 struct search_path *,
+						 struct search_path **));
+static struct search_path * remove_dup_nonsys_dirs PARAMS ((cpp_reader *,
+						 struct search_path **,
 						 struct search_path *));
 static struct search_path * remove_dup_dirs PARAMS ((cpp_reader *,
-						 struct search_path *));
+						 struct search_path **));
 static void merge_include_chains	PARAMS ((cpp_reader *));
 static bool push_include		PARAMS ((cpp_reader *,
 						 struct pending_option *));
@@ -272,55 +276,86 @@ append_include_chain (pfile, dir, path, 
 }
 
 /* Handle a duplicated include path.  PREV is the link in the chain
-   before the duplicate.  The duplicate is removed from the chain and
-   freed.  Returns PREV.  */
+   before the duplicate, or NULL if the duplicate is at the head of
+   the chain.  The duplicate is removed from the chain and freed.
+   Returns PREV.  */
 static struct search_path *
-remove_dup_dir (pfile, prev)
+remove_dup_dir (pfile, prev, head_ptr)
      cpp_reader *pfile;
      struct search_path *prev;
+     struct search_path **head_ptr;
 {
-  struct search_path *cur = prev->next;
+  struct search_path *cur;
+
+  if (prev != NULL)
+    {
+      cur = prev->next;
+      prev->next = cur->next;
+    }
+  else
+    {
+      cur = *head_ptr;
+      *head_ptr = cur->next;
+    }
 
   if (CPP_OPTION (pfile, verbose))
     fprintf (stderr, _("ignoring duplicate directory \"%s\"\n"), cur->name);
 
-  prev->next = cur->next;
   free ((PTR) cur->name);
   free (cur);
 
   return prev;
 }
 
+/* Remove duplicate non-system directories for which there is an equivalent
+   system directory latter in the chain.  The range for removal is between
+   *HEAD_PTR and END.  Returns the directory before END, or NULL if none.
+   This algorithm is quadratic in the number of -I switches, which is
+   acceptable since there aren't usually that many of them.  */
+static struct search_path *
+remove_dup_nonsys_dirs (pfile, head_ptr, end)
+     cpp_reader *pfile;
+     struct search_path **head_ptr;
+     struct search_path *end;
+{
+  struct search_path *prev = NULL, *cur, *other;
+
+  for (cur = *head_ptr; cur != end; cur = cur ? cur->next : *head_ptr)
+    {
+      if (!cur->sysp)
+	{
+	  for (other = cur->next; other; other = other->next)
+	    if (INO_T_EQ (cur->ino, other->ino)
+		&& cur->dev == other->dev
+		&& other->sysp)
+	      {
+		cur = remove_dup_dir (pfile, prev, head_ptr);
+		break;
+	      }
+	}
+      prev = cur;
+    }
+
+  return prev;
+}
+
 /* Remove duplicate directories from a chain.  Returns the tail of the
    chain, or NULL if the chain is empty.  This algorithm is quadratic
    in the number of -I switches, which is acceptable since there
    aren't usually that many of them.  */
 static struct search_path *
-remove_dup_dirs (pfile, head)
+remove_dup_dirs (pfile, head_ptr)
      cpp_reader *pfile;
-     struct search_path *head;
+     struct search_path **head_ptr;
 {
   struct search_path *prev = NULL, *cur, *other;
 
-  for (cur = head; cur; cur = cur->next)
+  for (cur = *head_ptr; cur; cur = cur->next)
     {
-      for (other = head; other != cur; other = other->next)
-        if (INO_T_EQ (cur->ino, other->ino) && cur->dev == other->dev)
+      for (other = *head_ptr; other != cur; other = other->next)
+	if (INO_T_EQ (cur->ino, other->ino) && cur->dev == other->dev)
 	  {
-	    if (cur->sysp && !other->sysp)
-	      {
-		cpp_warning (pfile,
-			     "changing search order for system directory \"%s\"",
-			     cur->name);
-		if (strcmp (cur->name, other->name))
-		  cpp_warning (pfile, 
-			       "  as it is the same as non-system directory \"%s\"",
-			       other->name);
-		else
-		  cpp_warning (pfile, 
-			       "  as it has already been specified as a non-system directory");
-	      }
-	    cur = remove_dup_dir (pfile, prev);
+	    cur = remove_dup_dir (pfile, prev, head_ptr);
 	    break;
 	  }
       prev = cur;
@@ -358,28 +393,33 @@ merge_include_chains (pfile)
   else
     brack = systm;
 
-  /* This is a bit tricky.  First we drop dupes from the quote-include
-     list.  Then we drop dupes from the bracket-include list.
-     Finally, if qtail and brack are the same directory, we cut out
-     brack and move brack up to point to qtail.
+  /* This is a bit tricky.  First we drop non-system dupes of system
+     directories from the merged bracket-include list.  Next we drop
+     dupes from the bracket and quote include lists.  Then we drop
+     non-system dupes from the merged quote-include list.  Finally,
+     if qtail and brack are the same directory, we cut out brack and
+     move brack up to point to qtail.
 
      We can't just merge the lists and then uniquify them because
      then we may lose directories from the <> search path that should
-     be there; consider -Ifoo -Ibar -I- -Ifoo -Iquux. It is however
+     be there; consider -Ifoo -Ibar -I- -Ifoo -Iquux.  It is however
      safe to treat -Ibar -Ifoo -I- -Ifoo -Iquux as if written
      -Ibar -I- -Ifoo -Iquux.  */
 
-  remove_dup_dirs (pfile, brack);
-  qtail = remove_dup_dirs (pfile, quote);
+  remove_dup_nonsys_dirs (pfile, &brack, NULL);
+  remove_dup_dirs (pfile, &brack);
 
   if (quote)
     {
+      qtail = remove_dup_dirs (pfile, &quote);
       qtail->next = brack;
 
+      qtail = remove_dup_nonsys_dirs (pfile, &quote, brack);
+
       /* If brack == qtail, remove brack as it's simpler.  */
-      if (brack && INO_T_EQ (qtail->ino, brack->ino)
+      if (qtail && brack && INO_T_EQ (qtail->ino, brack->ino)
 	  && qtail->dev == brack->dev)
-	brack = remove_dup_dir (pfile, qtail);
+	brack = remove_dup_dir (pfile, qtail, &quote);
     }
   else
     quote = brack;
Index: doc/install.texi
===================================================================
RCS file: /cvsroot/gcc/gcc/gcc/doc/install.texi,v
retrieving revision 1.92.2.29
diff -u -3 -p -r1.92.2.29 install.texi
--- doc/install.texi	27 Jun 2002 19:11:31 -0000	1.92.2.29
+++ doc/install.texi	10 Aug 2002 04:27:09 -0000
@@ -464,6 +464,43 @@ any in that directory---are not part of 
 programs---perhaps many others.  (GCC installs its own header files in
 another directory which is based on the @option{--prefix} value.)
 
+Both the local-prefix include directory and the GCC-prefix include
+directory are part of GCC's "system include" directories.  Although these
+two directories are not fixed, they need to be searched in the proper
+order for the correct processing of the include_next directive.  The
+local-prefix include directory is searched before the GCC-prefix
+include directory.  Another characteristic of system include directories
+is that pedantic warnings are turned off for headers in these directories.
+
+Some autoconf macros add @option{-I @var{directory}} options to the
+compiler command line, to ensure that directories containing installed
+packages' headers are searched.  When @var{directory} is one of GCC's
+system include directories, GCC will ignore the option so that system
+directories are continued to be processed in the correct order.  This
+may result in a search order different from what was specified but the
+directory will still be searched.
+
+GCC automatically searches for ordinary libraries using
+@env{GCC_EXEC_PREFIX}.  Thus, when the same installation prefix is
+used for both GCC and packages, GCC will automatically search for
+both headers and libraries.  This provides a configuration that is
+easy to use.  GCC behaves in a manner similar to that when it is
+installed as a system compiler in @file{/usr}.
+
+Sites that need to install multiple versions of GCC may not want to
+use the above simple configuration.  It is possible to use the
+@option{--program-prefix}, @option{--program-suffix} and
+@option{--program-transform-name} options to install multiple versions
+into a single directory, but it may be simpler to use different prefixes
+and the @option{--with-local-prefix} option to specify the location of the
+site-specific files for each version.  It will then be necessary for
+users to specify explicitly the location of local site libraries
+(e.g., with @env{LIBRARY_PATH}).
+
+The same value can be used for both @option{--with-local-prefix} and
+@option{--prefix} provided it is not @file{/usr}.  This can be used
+to avoid the default search of @file{/usr/local/include}.
+
 @strong{Do not} specify @file{/usr} as the @option{--with-local-prefix}!
 The directory you use for @option{--with-local-prefix} @strong{must not}
 contain any of the system's standard header files.  If it did contain

Re: gcc 3.2's cpp breaks configure scripts

[Nix]

On Sun, 11 Aug 2002, John David Anglin mused:
> Jeff,
> 
>> cpp is spitting out a warning about changing the search order of include
>> directories, and this is breaking a _ton_ of configure scripts. I found
>> this when I started rebuilding Mandrake with gcc-3.2 branch.
> 
> You might try the patch below and see if it fixes your problem.  It is a
> variant for gcc-3.2 branch of the patch proposed in this message for the
> main: < http://gcc.gnu.org/ml/gcc-patches/2002-08/msg00708.html >.

Nice :)

> +   This algorithm is quadratic in the number of -I switches, which is
> +   acceptable since there aren't usually that many of them.  */

You could invert it to yield something that was quadratic in the number
of system directories, which might be preferable since the number of
system directories is fixed and may be quite low compared to the silly
number of -I flags used by some programs (look at Evolution build one of
these days); something like

static struct search_path *
remove_dup_nonsys_dirs (pfile, head_ptr, end)
     cpp_reader *pfile;
     struct search_path **head_ptr;
     struct search_path *end;
{
  struct search_path *cur;

  for (cur = *head_ptr; cur != end; cur = cur ? cur->next : *head_ptr)
    if (cur->sysp)
      {
	struct search_path *prev, *other;
        for (other = *head_ptr, prev = NULL; other && other != cur;
             other = other->next)
          {
            if (INO_T_EQ (cur->ino, other->ino)
                && cur->dev == other->dev
                && !(other->sysp))
              {
                other = remove_dup_dir (pfile, prev, head_ptr);
                break;
	      }
            prev = other;
          }
      }

  return prev;
}

(I'm not sure whether the head_ptr manipulation in the outer loop is
needed anymore, and this is utterly untested).

> +system include directories, GCC will ignore the option so that system
> +directories are continued to be processed in the correct order.  This

s/are continued to be/continue to be/

> +Sites that need to install multiple versions of GCC may not want to
> +use the above simple configuration.  It is possible to use the
> +@option{--program-prefix}, @option{--program-suffix} and
> +@option{--program-transform-name} options to install multiple versions
> +into a single directory,

Even though I've done this myself forever, it *is* quite tricky to keep
libstdc++ working for multiple GCC versions in that situation.

(--enable-version-specific-runtime-libs or waiting for GCC 3.3 is the
solution to that, of course.)

-- 
`There's something satisfying about killing JWZ over and over again.'
                                        -- 1i, personal communication

Re: gcc 3.2's cpp breaks configure scripts

[Gareth Pearce]

>
> > > The Right Thing to do is not to add -I/usr/include because that can 
>cause
> > > subtle breakage as well.
> >
> > Or maybe the right thing is to fix autoconf so that it doesn't think a
> > warning is a fatal error.
>
>The problem is that there are very large numbers of GNU and other freeware
>packages out there with this defect in their autoconf files.  When we
>release 3.2, people are going to have a bear of a time building
>distributions.  It will be seen as a gcc problem, even if a good argument
>can be made that it is an autoconf problem.

So now would be a good time to be out pushing for projects to upgrade to 
autoconf 2.5+ (which I am told fixes the problem)?

Having had the situation kindly explained to me in another branch of this 
thread
I see 3 options
1. leave it as is, get out there and push (help even!)
2. drop the warning/enable disablement of warning (last option not liked)
3. add a flag which autoremoves any -I which causes the warning. (doubt this 
is going to go over too well either)
1 = lots of work
2 = back to before with lots of potential breakage...
3 = removes onus to fix the actual problem.

Gareth


_________________________________________________________________
MSN Photos is the easiest way to share and print your photos: 
http://photos.msn.com/support/worldwide.aspx

Re: gcc 3.2's cpp breaks configure scripts

[H}kan Hjort]

John David Anglin wrote:
> The gcc warning is correct in the cases that I have examined.  I don't
> believe that configure should be adding include directories to CPPFLAGS
> that are already being searched as system directories by gcc.  This
> changes the include search order as noted in the warning and may
> cause unexpected results.
>
Ah but which are theses directories?  There is no way to know as far
as I can see.  (If you don't fancy doing some rather serious parsing
of either the specfile, the output from -dumpspecs or from gcc -v -E).

Since some thimes for example /usr/local/include will be a system
directory and some times not.

[snip]
> There may be some debate as to what directories gcc should treat
> as "system" directories.  However, configure shouldn't change
> the default search order of gcc without good reason, irrespective
> of whether the directories are truly system directories or not.
> this affects gcc's mechanism to fix headers.

Ehh.. not everyone installs every pice of software out there in /usr
so then you need to tell configure where to find the stuff, and it in
turn needs to add the -I and -L / -R flags.

Now if user says that 'oh I have libjpeg installed in /usr/local', 
should I then add -I/usr/local/include to CPPFLAGS or not?

If I do so on a standard Linux system it will fail becuse of:
cpp0: warning: changing search order for system directory "/usr/local/include"
cpp0: warning:   as it has already been specified as a non-system directory

on the other hand if I don't then on a FreeBSD system it will fail with:
conftest.c:4:17: jpeglib.h: No such file or directory

[snip]
> Possibly, if gcc provided a simpler way to print the search order,
> the autoconf macro authors could be persuaded not to append these
> directories to CPPFLAGS.  The reasons to do this are documented.
> Turning the warning off is not the correct solution, although there
> may be some circumstances in which it is emitted when it shouldn't
> be.

Or if there where autoconf macros that handled all of this instead of
each package having the code to let users specify if/where a dependecy
can be found.  Then trying to work out if the path must or must _not_
be added.

The fact that there still are many configure scripts out there that now
fail just because of this, still stands.  The only way to turn of this
warning is with -w  'Inhibit warning messages'.
I don't know if adding that to CPPFLAGS will cause any other averse 
affects.

-- 
HÃ¥kan Hjort

Re: gcc 3.2's cpp breaks configure scripts

[John David Anglin]

> John David Anglin wrote:
> > The gcc warning is correct in the cases that I have examined.  I don't
> > believe that configure should be adding include directories to CPPFLAGS
> > that are already being searched as system directories by gcc.  This
> > changes the include search order as noted in the warning and may
> > cause unexpected results.
> >
> Ah but which are theses directories?  There is no way to know as far
> as I can see.  (If you don't fancy doing some rather serious parsing
> of either the specfile, the output from -dumpspecs or from gcc -v -E).

Enclosed is a patch to the gettext macros lib-link.m4 and lib-prefix.m4
to prevent them from appending GCC system directories to CPPFLAGS.  It
uses "gcc -v -E" and checks for the warning.  I have tested the patch
by building textutils-2.1 using the new macros.  Possibly, the macros
can be improved but the patch seems to be doing what I want.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

2002-07-31  John David Anglin  <dave@hiauly1.hia.nrc.ca>

	* lib-link.m4: Don't add GCC system include directories to CPPFLAGS.
	* lib-prefix.m4: Likewise.

--- lib-link.m4.orig	Sat Jul 20 03:15:04 2002
+++ lib-link.m4	Thu Aug  1 21:57:16 2002
@@ -345,9 +345,10 @@
               dnl But don't add it
               dnl   1. if it's the standard /usr/include,
               dnl   2. if it's /usr/local/include and we are using GCC on Linux,
-              dnl   3. if it's already present in $CPPFLAGS or the already
+              dnl   3. if it doesn't exist as a directory.
+              dnl   4. if it's a GCC system include directory,
+              dnl   5. if it's already present in $CPPFLAGS or the already
               dnl      constructed $INCNAME,
-              dnl   4. if it doesn't exist as a directory.
               if test "X$additional_includedir" != "X/usr/include"; then
                 haveit=
                 if test "X$additional_includedir" = "X/usr/local/include"; then
@@ -358,6 +359,17 @@
                   fi
                 fi
                 if test -z "$haveit"; then
+                  if test -d "$additional_includedir"; then
+                    if test -n "$GCC"; then
+                      if test -n "`echo 'main (){}' | $CC -v -E -I$additional_includedir - 2>&1 | grep 'changing search order for system directory'`"; then
+                        haveit=yes
+                      fi
+                    fi
+                  else
+                    haveit=yes
+                  fi
+                fi
+                if test -z "$haveit"; then
                   for x in $CPPFLAGS $INC[]NAME; do
                     AC_LIB_WITH_FINAL_PREFIX([eval x=\"$x\"])
                     if test "X$x" = "X-I$additional_includedir"; then
@@ -366,10 +378,8 @@
                     fi
                   done
                   if test -z "$haveit"; then
-                    if test -d "$additional_includedir"; then
-                      dnl Really add $additional_includedir to $INCNAME.
-                      INC[]NAME="${INC[]NAME}${INC[]NAME:+ }-I$additional_includedir"
-                    fi
+                    dnl Really add $additional_includedir to $INCNAME.
+                    INC[]NAME="${INC[]NAME}${INC[]NAME:+ }-I$additional_includedir"
                   fi
                 fi
               fi
--- lib-prefix.m4.orig	Sat Feb 16 06:24:09 2002
+++ lib-prefix.m4	Thu Aug  1 22:00:57 2002
@@ -51,6 +51,7 @@
     dnl   2. if it's already present in $CPPFLAGS,
     dnl   3. if it's /usr/local/include and we are using GCC on Linux,
     dnl   4. if it doesn't exist as a directory.
+    dnl   5. if it's a GCC system include directory,
     if test "X$additional_includedir" != "X/usr/include"; then
       haveit=
       for x in $CPPFLAGS; do
@@ -68,11 +69,20 @@
             esac
           fi
         fi
-        if test -z "$haveit"; then
-          if test -d "$additional_includedir"; then
-            dnl Really add $additional_includedir to $CPPFLAGS.
-            CPPFLAGS="${CPPFLAGS}${CPPFLAGS:+ }-I$additional_includedir"
+      fi
+      if test -z "$haveit"; then
+        if test -d "$additional_includedir"; then
+          if test -n "$GCC"; then
+            if test -n "`echo 'main (){}' | $CC -v -E -I$additional_includedir - 2>&1 | grep 'changing search order for system directory'`"; then
+              haveit=yes
+            fi
           fi
+        else
+          haveit=yes
+        fi
+        if test -z "$haveit"; then
+          dnl Really add $additional_includedir to $CPPFLAGS.
+          CPPFLAGS="${CPPFLAGS}${CPPFLAGS:+ }-I$additional_includedir"
         fi
       fi
     fi

Re: gcc 3.2's cpp breaks configure scripts

[Bruno Haible]

John David Anglin writes:
> Enclosed is a patch to the gettext macros lib-link.m4 and lib-prefix.m4
> to prevent them from appending GCC system directories to CPPFLAGS.  It
> uses "gcc -v -E" and checks for the warning.

The patch does the wrong thing in half of the cases.

If the added directory is one of the directories on which fixincludes
is run, then
  1. gcc's warning is justified,
  2. Users shouldn't install additional packages (such as libintl,
     libiconv etc.) in this directory. It won't work because the
     include file seen by gcc might be the fixincluded one, which
     represents a different version of the package than the one
     which is being installed as a library.
     It'd be good if the GCC documentation mentioned this pitfall.

If the added directory is not a fixincluded one, then there is no
reason for GCC warning - except for Jakub's arguments.

Jakub Jelinek writes:

> > you're saying that adding -I/usr/include (or similar) can cause libstdc++ 
> > headers to break due to the way they use #include_next?
> Yes.

Then indeed it would be wrong to add -Idir to the command line. But
then also, you should document in the GCC documentation that users
should not install packages in these directories. Because any freshly
installed .h file in such a directory may be hidden by the ones in
gcc's private gcc-lib/platform/version/include directory, which are
older but have not been updated.

In this case, it'd be best for autoconf macro authors if gcc provided
an easy to use, documented way to test whether a directory is
forbidden for -I or not. I'd then use this test in two situations:
  1) When searching for a library and its include files, this
     directory shall be skipped, even if it equals $prefix/include,
  2) When installing a library, configure will refuse to install in
     such a forbidden directory.

> Also, -I/usr/include changes the status of /usr/include headers from
> system headers to user headers, thus you may get warnings (or errors
> with -Werror) where you otherwise would not get any.

This is an indication that cpp's heuristic to distinguish "user" and
"system" heads is wrong.

Bruno

Re: gcc 3.2's cpp breaks configure scripts

[John David Anglin]

> John David Anglin writes:
> > Enclosed is a patch to the gettext macros lib-link.m4 and lib-prefix.m4
> > to prevent them from appending GCC system directories to CPPFLAGS.  It
> > uses "gcc -v -E" and checks for the warning.
> 
> The patch does the wrong thing in half of the cases.

Which cases are these?  Irrespective of whether or not the directory
is truly a "system" directory, the patch detects directories that
gcc will search.  A "-I" is unnecessary for these directories unless
you actually want to change the search order.   This is dangerous
unless you have intimate knowledge of how the system is configured.

Gcc has a predefined search order for its "system" directories
and I have yet to see a convincing reason why its necessary to change
this order for building packages which use the gettext macros.  The
only situation where I can see a problem is when a header is
installed in two of the directories searched automatically by gcc
and the user attempts to select the one that is searched second.
With my patch, you will get the header in the first directory
rather than the one in the second directory and this could cause
a problem due to inconsistent versions.  I would prefer configure
checked for this than give up the predefined search order.

As noted in previous mail, gcc searches both /usr/local/include and
/opt/gnu/include when it is configured with /opt/gnu, so if you
add -I/opt/gnu the search order of the two directories is changed.
This may cause different headers to be used and cause unexpected
results for other headers depending on how the system is configured.

> If the added directory is one of the directories on which fixincludes
> is run, then
>   1. gcc's warning is justified,
>   2. Users shouldn't install additional packages (such as libintl,
>      libiconv etc.) in this directory. It won't work because the
>      include file seen by gcc might be the fixincluded one, which
>      represents a different version of the package than the one
>      which is being installed as a library.
>      It'd be good if the GCC documentation mentioned this pitfall.

Yes, that's a valid point.  In the case at hand, none of the above
were installed in a fixincludes directory.  The main point of debate
is whether or not the search order of non-fixinclude include directories
should by changeable without a warning.  Personally, I think it's a
mugs game to try rearrange the header search order to select a
specific set of headers.

> > Also, -I/usr/include changes the status of /usr/include headers from
> > system headers to user headers, thus you may get warnings (or errors
> > with -Werror) where you otherwise would not get any.
> 
> This is an indication that cpp's heuristic to distinguish "user" and
> "system" heads is wrong.

Agreed.  However, I think we have to live with the fixinclude scheme
and the fact that gcc has a set of include directories that it searches
in a predefined order.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc 3.2's cpp breaks configure scripts

[Paul Eggert]

> From: "John David Anglin" <dave@hiauly1.hia.nrc.ca>
> Date: Fri, 2 Aug 2002 15:29:29 -0400 (EDT)
> 
> As noted in previous mail, gcc searches both /usr/local/include and
> /opt/gnu/include when it is configured with /opt/gnu, so if you
> add -I/opt/gnu the search order of the two directories is changed.
> This may cause different headers to be used and cause unexpected
> results for other headers depending on how the system is configured.

But GCC warns in many cases where there is no problem.  It is crying
wolf far too often in practice.  People are learning to ignore those
warnings.

I am considering putting a sed filter around GCC to remove these
warnings entirely.  But, more likely, I will install GCC in a
nonstandard place, so that it doesn't include my local equivalent of
/opt/gnu/include by default.  I think that's what Bruno's sysadmin
does.  It is an ugly solution (e.g., it means I'll see
"-I/opt/gnu/include" a lot), but it beats dealing with this hassle all
the time.

If GCC warned only when there was a real problem, a lot of these issues
would go away.

> The main point of debate is whether or not the search order of
> non-fixinclude include directories should by changeable without a
> warning.  Personally, I think it's a mugs game to try rearrange the
> header search order to select a specific set of headers.

In all the cases where I've seen this warning, the header search order
did not matter, and the files behaved identically in "user" and
"system" mode, so GCC's warning was inappropriate.

> > > Also, -I/usr/include changes the status of /usr/include headers from
> > > system headers to user headers, thus you may get warnings (or errors
> > > with -Werror) where you otherwise would not get any.
> > 
> > This is an indication that cpp's heuristic to distinguish "user" and
> > "system" heads is wrong.
> 
> Agreed.  However, I think we have to live with the fixinclude scheme

No, we could fix system includes files on every run of GCC, for
example.  In the old days that would have been impractical for
performance reasons, but nowadays the hassle of dealing with this
problem outweighs any minor slowdowns that would accrue from fixing
system include files dynamically.

There are other possible solutions too, basically building on the
__STDC__ idea that GCC already uses.

This problem is becoming a major inconvenience in using GCC, and it
would be nice if someone would fix it.

Re: gcc 3.2's cpp breaks configure scripts

[Nix]

On Fri, 2 Aug 2002, Paul Eggert said:
> If GCC warned only when there was a real problem, a lot of these issues
> would go away.

Alternatively, GCC could simply ignore the -I switches that would
trigger those warnings in situations where those warnings are now
emitted. Is there ever any reason you'd *want* GCC to do that
reordering? I can't think of any occasion when I'd want to avoid
fixincluded headers... they have after all been fixincluded for a
reason (and if the fixincluded headers are broken the solution is
to delete the broken ones and fix fixincludes, not to supply
an extra -I/usr/include switch to everything!)

-- 
`There's something satisfying about killing JWZ over and over again.'
                                        -- 1i, personal communication

Re: gcc 3.2's cpp breaks configure scripts

[John David Anglin]

> On Fri, 2 Aug 2002, Paul Eggert said:
> > If GCC warned only when there was a real problem, a lot of these issues
> > would go away.
> 
> Alternatively, GCC could simply ignore the -I switches that would
> trigger those warnings in situations where those warnings are now
> emitted. Is there ever any reason you'd *want* GCC to do that

I think you have to assume the user knows best and wants the change
in ordering and error treatment.  If you want to test warnings from
system headers, you can use -nostdinc and configure system and user
headers as you wish.

> reordering? I can't think of any occasion when I'd want to avoid
> fixincluded headers... they have after all been fixincluded for a
> reason (and if the fixincluded headers are broken the solution is
> to delete the broken ones and fix fixincludes, not to supply
> an extra -I/usr/include switch to everything!)

Agreed but hey this is "unix".  Anybody know which autoconf macro
was responsible for the "-I/usr/include" in the original problem
report?  The current gettext macros which have caused problems
for me don't add /usr/include.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc 3.2's cpp breaks configure scripts

[Zack Weinberg]

I would appreciate it if people would not send gcc-related mail to
zackw@stanford.edu; that address is likely to stop working in the near
future, and in any case it forwards to an inconvenient location.

I'll make a substantive comment on John's other post.

zw

Re: gcc 3.2's cpp breaks configure scripts

[Gareth Pearce]

> On Fri, 2 Aug 2002, Paul Eggert said:
> > If GCC warned only when there was a real problem, a lot of these issues
> > would go away.
>
> Alternatively, GCC could simply ignore the -I switches that would
> trigger those warnings in situations where those warnings are now
> emitted. Is there ever any reason you'd *want* GCC to do that
> reordering? I can't think of any occasion when I'd want to avoid
> fixincluded headers... they have after all been fixincluded for a
> reason (and if the fixincluded headers are broken the solution is
> to delete the broken ones and fix fixincludes, not to supply
> an extra -I/usr/include switch to everything!)

I agree that this is what I would like to see - however 2 points
1. Someone will complain about lack of flexibility, so there has to be a way
to disable this overide.
2.  Its possibly somewhat 'antistandard' to overide the passed parameters,
so this feature should Possibly default to off.

Gareth

Re: gcc 3.2's cpp breaks configure scripts

[John David Anglin]

> > As noted in previous mail, gcc searches both /usr/local/include and
> > /opt/gnu/include when it is configured with /opt/gnu, so if you
> > add -I/opt/gnu the search order of the two directories is changed.
> > This may cause different headers to be used and cause unexpected
> > results for other headers depending on how the system is configured.
> 
> But GCC warns in many cases where there is no problem.  It is crying
> wolf far too often in practice.  People are learning to ignore those
> warnings.

Here is the history of the situation as I understand it:

1)  gcc 2.95 and earlier simply added directories to the search list
    without any checks for redundency or changes from system to
    non-system.  As a result, a directory can appear multiple
    times in the search list.

2)  gcc 3.0.x issues warning "ignoring duplicate directory"
    when a duplicate directory is specified and the "-v" option
    is used.

3)  gcc 3.1.x issue warning "cpp0: warning: changing search order
    for system directory" when a system directory is added with
    "-I".  There is no warning about changing the search
    order with "-isystem".  We still have the "ignoring duplicate
    directory" warning with "-v".

4)  gcc 3.3 is the same as gcc 3.1.x except "cpp0" is now "cc1".

All versions search the same set of directories:

  /usr/local/include
  /opt/gnu/include
  /opt/gnu/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.1.1/include
  /opt/gnu/hppa2.0w-hp-hpux11.00/include
  /usr/include

where "/opt/gnu" was the prefix used to build gcc for the target
hppa2.0w-hp-hpux11.00.

/usr/include is the only directory for which includes are fixed.

libstdc++ headers are installed in /opt/gnu/include unless the
gcc prefix is /usr/local, in which case they are installed in
/usr/local/include.  I stopped installing gcc and packages in
/usr/local since I need to install multiple configurations
(32-bit and 64-bit, etc).  It appears that installing gcc with
--prefix=/usr/local will effectively prevent other installations
from working properly as the g++-v3 headers will always be
found in /usr/local unless the user reorders the system headers.
The same is true for any package which installs headers to
/usr/local.  It might be better if the v3 headers were in
/opt/gnu/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.1.1/include.

I believe that the automatic search of /usr/local/include is wrong
when gcc was configured with a prefix that is not /usr/local.  This
makes it very difficult for a user to install another version of
gcc in a different location and have it load the correct headers.

Searching for "include_next" in ${prefix}/include, I find two uses
under hppa-linux (a.out.h and limits.h) and none under hppa2.0w-hp-hpux11.
The two headers under hppa-linux are from glibc.  Thus, I agree
that there are very few situations where the headers loaded might
change as a result of reordering gcc's automatic search direcories.

> This problem is becoming a major inconvenience in using GCC, and it
> would be nice if someone would fix it.

1) The header search mechanism is implementation defined and thus
   autoconf and package developers will have to adopt to whatever
   schemes are used in gcc releases.  Possibly, Bruno would accept
   a modified version of my patch where we add gcc system headers
   to CPPFLAGS with "-isystem" instead of dropping them.  This will
   reorder the headers without the warning.  Another alterative
   is to use -nostdinc and -isystem to completely rebuild gcc's
   notion of system headers but this seems more complicated.

2) I would like to see the matter of the /usr/local/include reviewed.
   It definitely shouldn't be the first system include directory
   searched and possibly it shouldn't be searched automatically
   at all when gcc is configured with a prefix other than /usr/local.
   Reducing the number of system directories, simplifies the issues
   of header ordering.  As a result, the autoconf macros are less
   likely to have to add more than one "-isystem" directory and
   determine the ordering needed.  The current gettext macros
   don't attempt to reorder /usr/include.

3) The warning is ambiguous.  Is it about the change in search order
   or the change from a system include to a non-system include directory?
   Since there is no warning when "-isystem" is used, I suspect that
   the warning is about the change to a non-system directory.  In
   that case, we can do without warnings for /usr/local/include
   and /opt/gnu.

4) Let's move the v3 headers to gcc's private include directory so that
   correct versions are automatically used.

Comments?

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc 3.2's cpp breaks configure scripts

[Gabriel Dos Reis]

"John David Anglin" <dave@hiauly1.hia.nrc.ca> writes:

[...]

| libstdc++ headers are installed in /opt/gnu/include unless the
| gcc prefix is /usr/local, in which case they are installed in
| /usr/local/include.  I stopped installing gcc and packages in
| /usr/local since I need to install multiple configurations
| (32-bit and 64-bit, etc).  It appears that installing gcc with
| --prefix=/usr/local will effectively prevent other installations
| from working properly as the g++-v3 headers will always be
| found in /usr/local unless the user reorders the system headers.
| The same is true for any package which installs headers to
| /usr/local.  It might be better if the v3 headers were in
| /opt/gnu/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.1.1/include.

Please note that with current source, V3 is installed in
${prefix}/include/c++/${version}/; and within that directory,
target-specific headers are installed in appropriate subdirectory.

-- Gaby

Re: gcc 3.2's cpp breaks configure scripts

[Zack Weinberg]

On Sat, Aug 03, 2002 at 05:42:11PM -0400, John David Anglin wrote:
> Here is the history of the situation as I understand it:
> 
> 1)  gcc 2.95 and earlier simply added directories to the search list
>     without any checks for redundency or changes from system to
>     non-system.  As a result, a directory can appear multiple
>     times in the search list.

Correct.

> 2)  gcc 3.0.x issues warning "ignoring duplicate directory"
>     when a duplicate directory is specified and the "-v" option
>     is used.

Yes.  (cpplib has done that for ages; you will, frex, get the warning
with some 2.96 and 2.97 era compilers.)  No one has ever objected to
this as far as I know.

> 3)  gcc 3.1.x issue warning "cpp0: warning: changing search order
>     for system directory" when a system directory is added with
>     "-I".  There is no warning about changing the search
>     order with "-isystem".  We still have the "ignoring duplicate
>     directory" warning with "-v".

Yes.  The warning was added in July 2001 by Nathan Sidwell.  The
original message proposing it is
http://gcc.gnu.org/ml/gcc-patches/2001-05/msg00466.html - yes, May;
the discussion broke off and was resumed in July, starting at
http://gcc.gnu.org/ml/gcc-patches/2001-07/msg00046.html

There is not much discussion of the rationale for the patch in this
context, just a mention of problems with libstdc++.  Nathan, would you
mind expanding a bit?

> 4)  gcc 3.3 is the same as gcc 3.1.x except "cpp0" is now "cc1".

Yah.

> All versions search the same set of directories:
> 
>   /usr/local/include
>   /opt/gnu/include
>   /opt/gnu/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.1.1/include
>   /opt/gnu/hppa2.0w-hp-hpux11.00/include
>   /usr/include
> 
> where "/opt/gnu" was the prefix used to build gcc for the target
> hppa2.0w-hp-hpux11.00.

As far as I can tell, 2.95 and 3.0 would not have searched
/opt/gnu/include (i.e. $(prefix)/include) at all.  Per Bothner 
changed this in September 2001, with this patch:
http://gcc.gnu.org/ml/gcc-patches/2001-09/msg00519.html
It was generally agreed that not searching $(prefix)/include was a
bug.

> /usr/include is the only directory for which includes are fixed.

More accurately, $(SYSTEM_HEADER_DIR) is the only directory for which
includes are fixed.  There is $(OTHER_FIXINCLUDES_DIRS), but nothing
uses it.  SYSTEM_HEADER_DIR is normally /usr/include, but in a cross
compiler it's $(exec_prefix)/$(target_alias)/sys-include, and several
target fragments override it (incorrectly; they should be changing
NATIVE_SYSTEM_HEADER_DIR...)

> libstdc++ headers are installed in /opt/gnu/include unless the
> gcc prefix is /usr/local, in which case they are installed in
> /usr/local/include.  I stopped installing gcc and packages in
> /usr/local since I need to install multiple configurations
> (32-bit and 64-bit, etc).  It appears that installing gcc with
> --prefix=/usr/local will effectively prevent other installations
> from working properly as the g++-v3 headers will always be
> found in /usr/local unless the user reorders the system headers.
> The same is true for any package which installs headers to
> /usr/local.  It might be better if the v3 headers were in
> /opt/gnu/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.1.1/include.

I believe there were other bug reports requesting this move, too.
You'd have to take that up with the libstdc++ people though.

...
> 2) I would like to see the matter of the /usr/local/include reviewed.
>    It definitely shouldn't be the first system include directory
>    searched and possibly it shouldn't be searched automatically
>    at all when gcc is configured with a prefix other than /usr/local.
>    Reducing the number of system directories, simplifies the issues
>    of header ordering.  As a result, the autoconf macros are less
>    likely to have to add more than one "-isystem" directory and
>    determine the ordering needed.  The current gettext macros
>    don't attempt to reorder /usr/include.

There are two very good reasons why /usr/local/include is searched
independent of whether it's $(prefix)/include: First, if you are
building with prefix=/usr, (or prefix="", if you're those crazy Hurd
people) you still want /usr/local/include searched.  Second, if you
are a user installing gcc in their home directory (on a multi-user
system, where you don't have write privs anywhere else), again you
probably still want /usr/local/include searched.

Could you expand a bit on your assertion that this makes it difficult
for a user to install gcc in an unusual location and have it find the
correct headers, please?  I do not see how the problem arises.

> 3) The warning is ambiguous.  Is it about the change in search order
>    or the change from a system include to a non-system include directory?
>    Since there is no warning when "-isystem" is used, I suspect that
>    the warning is about the change to a non-system directory.

Correct; see above.

>    In that case, we can do without warnings for /usr/local/include
>    and /opt/gnu.

I do not see how this follows.  The problems caused by
-I <dir on system path> are not merely because of failure to pick up
fixincluded headers.  For instance, Dan Jacobowitz points out that
-I/usr/include can cause havoc when used with a cross compiler; it
seems to me that -I/usr/local/include could cause just as much havoc.
(He wanted these to warn in a cross configuration, which I must
confess I don't see any way to do - how do we know that
-I/gltz/quux/include happens to contain headers for the wrong target?

My inclination, for the record, is to do nothing until all parties
come to an agreement on what GCC's behavior _should_ be.  At present,
I suspect that any patch will be immediately followed by another horde
of objectors demanding it be put back the way it was.

zw

Re: gcc 3.2's cpp breaks configure scripts

[John David Anglin]

> Yes.  (cpplib has done that for ages; you will, frex, get the warning
> with some 2.96 and 2.97 era compilers.)  No one has ever objected to
> this as far as I know.

I have no objection to this.  I pointed it out because it is one possible
method to determine whether a given directory is a gcc system include
directory before 3.3.

> There is not much discussion of the rationale for the patch in this
> context, just a mention of problems with libstdc++.  Nathan, would you
> mind expanding a bit?

From what Jakub has mention, it revolves around the treatment of
include_next.  Part of the reason I thought the v3 header might
might be better in gcc's private header directory was because
some systems appear to use wrap v3 headers and I couldn't conceive
of any reason why an application developer would want to reorder
gcc's search path from this point onward although I must admit
the thread started with an attempt to reorder /usr/include.

> > All versions search the same set of directories:
> > 
> >   /usr/local/include
> >   /opt/gnu/include
> >   /opt/gnu/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.1.1/include
> >   /opt/gnu/hppa2.0w-hp-hpux11.00/include
> >   /usr/include
> > 
> > where "/opt/gnu" was the prefix used to build gcc for the target
> > hppa2.0w-hp-hpux11.00.
> 
> As far as I can tell, 2.95 and 3.0 would not have searched
> /opt/gnu/include (i.e. $(prefix)/include) at all.  Per Bothner 
> changed this in September 2001, with this patch:
> http://gcc.gnu.org/ml/gcc-patches/2001-09/msg00519.html
> It was generally agreed that not searching $(prefix)/include was a
> bug.

I find this very convenient because on the PA I do builds for both
32-bit and 64-bit code, and there is at the moment no way to integrate
the two.  Thus, I use separate prefix for the two.  I can't use
/usr/local/lib for libraries because the 32 and 64-bit libraries
have the same name.

> > libstdc++ headers are installed in /opt/gnu/include unless the

Gabriel pointed out that v3 now uses a version scheme for headers.
However, it appears the 3.1/3.2 branch and before uses g++-v3.

> > gcc prefix is /usr/local, in which case they are installed in
> > /usr/local/include.  I stopped installing gcc and packages in
> > /usr/local since I need to install multiple configurations
> > (32-bit and 64-bit, etc).  It appears that installing gcc with
> > --prefix=/usr/local will effectively prevent other installations
> > from working properly as the g++-v3 headers will always be
> > found in /usr/local unless the user reorders the system headers.
> > The same is true for any package which installs headers to
> > /usr/local.  It might be better if the v3 headers were in
> > /opt/gnu/lib/gcc-lib/hppa2.0w-hp-hpux11.00/3.1.1/include.
> 
> I believe there were other bug reports requesting this move, too.
> You'd have to take that up with the libstdc++ people though.
> 
> ...
> > 2) I would like to see the matter of the /usr/local/include reviewed.
> >    It definitely shouldn't be the first system include directory
> >    searched and possibly it shouldn't be searched automatically
> >    at all when gcc is configured with a prefix other than /usr/local.
> >    Reducing the number of system directories, simplifies the issues
> >    of header ordering.  As a result, the autoconf macros are less
> >    likely to have to add more than one "-isystem" directory and
> >    determine the ordering needed.  The current gettext macros
> >    don't attempt to reorder /usr/include.
> 
> There are two very good reasons why /usr/local/include is searched
> independent of whether it's $(prefix)/include: First, if you are
> building with prefix=/usr, (or prefix="", if you're those crazy Hurd
> people) you still want /usr/local/include searched.  Second, if you

Special cases.

> are a user installing gcc in their home directory (on a multi-user
> system, where you don't have write privs anywhere else), again you
> probably still want /usr/local/include searched.

I'm not convinced of this one.  This is not much of an example but
HP compilers only search /usr/include by default.  When you add
additional directories to the search it gets complicated to bypass
them.  When a user installs gcc in their home directory, I think
they are better off explicitly adding /usr/local/include when
needed.

> Could you expand a bit on your assertion that this makes it difficult
> for a user to install gcc in an unusual location and have it find the
> correct headers, please?  I do not see how the problem arises.

The issue arises if a user installs a different version of a package
with headers from the one installed in /usr/local.  I think
the default gcc search will pick up headers from  /usr/local/include
in preference to ${gcc_install_prefix}/include.  However, there is
something strange here with respect to the v3 headers:

echo 'main(){}'|/home/dave/opt/gnu/gcc/gcc-3.1/bin/g++ -v -E -|less
...
gcc version 3.1
...
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /home/dave/opt/gnu/gcc/gcc-3.1/include
 /home/dave/opt/gnu/gcc/gcc-3.1/lib/gcc-lib/hppa-linux/3.1/include
 /usr/include
End of search list.
...

dave@gsyprf11:~/opt/gnu/include$ ll -l /usr/local/include/g++-v3/algorithm
-rw-r--r--    1 root     staff        2973 Apr 24 20:47 /usr/local/include/g++-v3/algorithm

However, with the simple program

dave@gsyprf11:~/opt/gnu/include$ cat algorithm.cc
#include <algorithm>

/home/dave/opt/gnu/gcc/gcc-3.1/bin/g++ -v -E algorithm.cc
...
# 1 "/home/dave/opt/gnu/gcc/gcc-3.1/include/g++-v3/algorithm" 1 3

For some reason the header from /usr/local/include/g++-v3 was not used.
However, if I do the same with a C header, it's loaded from /usr/local/include.
Thus, it appears the search for the v3 headers is special.

In addition,

echo '#include <algorithm>'|/home/dave/opt/gnu/gcc/gcc-3.1/bin/g++ -lang-c++ -v -E -
...
 /home/dave/opt/gnu/gcc/gcc-3.1/lib/gcc-lib/hppa-linux/3.1/cpp0 -lang-c -v -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -D__hppa__ -D__gnu_linux__ -Dlinux -D__ELF__ -D__unix__ -D__hppa__ -D__gnu_linux__ -D__linux__ -D__unix -D__linux -Asystem=unix -Asystem=posix -Acpu=hppa -Amachine=hppa -Amachine=bigendian -D__NO_INLINE__ -D__STDC_HOSTED__=1 -D_PA_RISC1_1 -
GNU CPP version 3.1 (cpplib) (hppa)
ignoring nonexistent directory "/home/dave/opt/gnu/gcc/gcc-3.1/hppa-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /home/dave/opt/gnu/gcc/gcc-3.1/include
 /home/dave/opt/gnu/gcc/gcc-3.1/lib/gcc-lib/hppa-linux/3.1/include
 /usr/include
End of search list.
<stdin>:1:21: algorithm: No such file or directory

For some reason, cpp0 runs in C mode even though g++ and "-lang-c++" are
specified on the command line.

> >    In that case, we can do without warnings for /usr/local/include
> >    and /opt/gnu.
> 
> I do not see how this follows.  The problems caused by

As discussed, the warnings are about whether the directories are
treated as a system directories or not.  This mainly affects warnings.
These directories are not being fixed and there may be valid
situations where a user would like to reorder the include search
with respect to these two directories.

Removal of the warnings for these directories would appear to resolve
many of the configure problems since the current gettext macros don't
allow reordering /usr/include or /usr/local/include under linux
(I have no idea why linux is special).  There must be some macros
that still add /usr/include but hopefully these are old.

If /usr/local/include isn't removed from the search list in the
situations discussed, then I think we need to allow reordering
and the change to a non-system directory without a warning given
the number of packages which use the gettext macros.  This might
be tightened up in the future.  At the moment, I am ambivalent
as to whether or not these directories need to be treated as system
directories since they are mainly used for site specific installations.

> -I <dir on system path> are not merely because of failure to pick up
> fixincluded headers.  For instance, Dan Jacobowitz points out that
> -I/usr/include can cause havoc when used with a cross compiler; it

I suspect that using "-I/usr/include" must be always wrong unless
"-nostdinc" is used.  Initially, I was against packages attempting
to reorder the gcc search process but enough package authors have
indicated that they don't like the warning and that they want
to be able to reorder the search despite the risks, that I have
second thoughts about it and maybe we should allow them to shoot
themselves in the foot so to speak.

> seems to me that -I/usr/local/include could cause just as much havoc.

Wouldn't be surprised.

> (He wanted these to warn in a cross configuration, which I must
> confess I don't see any way to do - how do we know that
> -I/gltz/quux/include happens to contain headers for the wrong target?

I guess the only way gcc would know would be if there was a mechanism
for a user to build it with a default set of headers for the target.

> My inclination, for the record, is to do nothing until all parties
> come to an agreement on what GCC's behavior _should_ be.  At present,
> I suspect that any patch will be immediately followed by another horde
> of objectors demanding it be put back the way it was.

That's the difficulty with the present situation.  Since the process
is implementation defined, we don't have a standard to fallback on.
We will only make progress on this with clear analysis and a bit of
leadership.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc 3.2's cpp breaks configure scripts

[Miles Bader]

I think /usr/local is well established as `a standard hierarchy that
overrides /usr', and so gcc should _definitely_ search /usr/local/include
before /usr/include -- many people depend on this behavior.

If you have a more complex installation that breaks (e.g., multiple local
versions of gcc installed), it's up to you to figure out a way to fix it, not
the great majority of people that use /usr/local only.

-Miles
-- 
P.S.  All information contained in the above letter is false,
      for reasons of military security.

Re: gcc 3.2's cpp breaks configure scripts

[Daniel Jacobowitz]

On Sat, Aug 03, 2002 at 04:07:07PM -0700, Zack Weinberg wrote:
> I do not see how this follows.  The problems caused by
> -I <dir on system path> are not merely because of failure to pick up
> fixincluded headers.  For instance, Dan Jacobowitz points out that
> -I/usr/include can cause havoc when used with a cross compiler; it
> seems to me that -I/usr/local/include could cause just as much havoc.
> (He wanted these to warn in a cross configuration, which I must
> confess I don't see any way to do - how do we know that
> -I/gltz/quux/include happens to contain headers for the wrong target?

Somewhat tangential to the current discussion, but I was referring
specifically to /usr/include and /usr/local/include, not to any sort of
${prefix}/include (which I always disable in our toolchains anyway; for
historical reasons our ${prefix}/include is where things like the cross
BFD's headers go, not where target headers go.  But that's just a quirk
of our environment.

> My inclination, for the record, is to do nothing until all parties
> come to an agreement on what GCC's behavior _should_ be.  At present,
> I suspect that any patch will be immediately followed by another horde
> of objectors demanding it be put back the way it was.

Absolutely agreed.

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer

Re: gcc 3.2's cpp breaks configure scripts

[Gareth Pearce]

>
>On Thu, Aug 01, 2002 at 07:03:43AM +0000, Gareth Pearce wrote:
> > but only with files which are fixincluded right? (not rhetorical)
>
>This has nothing to do with fixinclude. #include_next is used e.g.
>to include gcc's include header of the same name, or by libstdc++-v3
>headers to include C headers, etc.
>Also, -I/usr/include changes the status of /usr/include headers from
>system headers to user headers, thus you may get warnings (or errors
>with -Werror) where you otherwise would not get any.


Hmmm I think the lights starting to seep into my brain...  But just to be 
sure,
your saying that adding -I/usr/include (or similar) can cause libstdc++ 
headers to break due to the way they use #include_next?  If so then I guess 
its the rough road or no road...(too many special cases for my liking)  hmmm 
time to bug someone else then I guess :)

Gareth

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Re: gcc 3.2's cpp breaks configure scripts

[Jakub Jelinek]

On Thu, Aug 01, 2002 at 07:15:39AM +0000, Gareth Pearce wrote:
> Hmmm I think the lights starting to seep into my brain...  But just to be 
> sure,
> your saying that adding -I/usr/include (or similar) can cause libstdc++ 
> headers to break due to the way they use #include_next?

Yes.

	Jakub

Re: gcc 3.2's cpp breaks configure scripts

[Gareth Pearce]

> >
> > Hmm, I see, changed order (expected) - and gcc's syslimits not being 
>called,
> > but that seems okay since limits is already called... (ie it looks like 
>the
> > copy of linux I am looking at at least has been designed to handle this
> > situation) *shrug*
> > I see the possibility of breakage... not from the #include_next though. 
>(ie,
> > less potential breakage then if the #include_next wasnt there)
>
>limits.h with -I/usr/include was actually broken already twice
>in the history if I remember well and in both times changed after a while
>so that it works, though it is quite ugly. This is not the case with
>/usr/include/c++/<version> though and the more headers use #include_next
>this means more (potential) problems.

but only with files which are fixincluded right? (not rhetorical)
So possibly the mandatoryness of the warning could persist for just 
fixincluded headers not being chosen due to -I<dir> and be optional 
otherwise?  Or is it a case of make the transition to better pastures a 
rough road so that people travel faster - being considered more important.

Gareth


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Re: gcc 3.2's cpp breaks configure scripts

[Jakub Jelinek]

On Thu, Aug 01, 2002 at 07:03:43AM +0000, Gareth Pearce wrote:
> but only with files which are fixincluded right? (not rhetorical)

This has nothing to do with fixinclude. #include_next is used e.g.
to include gcc's include header of the same name, or by libstdc++-v3
headers to include C headers, etc.
Also, -I/usr/include changes the status of /usr/include headers from
system headers to user headers, thus you may get warnings (or errors
with -Werror) where you otherwise would not get any.

	Jakub

Re: gcc 3.2's cpp breaks configure scripts

[Gareth Pearce]

>
> > > cpp is spitting out a warning about changing the search order of 
>include
> > > directories, and this is breaking a _ton_ of configure scripts.  I 
>found
> > > this when I started rebuilding Mandrake with gcc-3.2 branch.
>
>Gareth Pearce writes:
> > This, from what little i have seen, seems to be due to the fact that 
>many
> > configure scripts segments are extremely overly picky.  They take any 
>output
> > at all as to mean that its failed.  Really it should seem to me that 
>they
> > should be looking for errors, or specific warnings rather then just 
>anything
> > at all.
>
>Just the same, it's a lot to ask the distributors of GNU/Linux and BSD
>systems to fix every configure script in the world.

Indeed it would be, but prehaps this should be suggested to the autoconf 
people for future versions?
>
>Maybe a workaround for the time being is to have a gcc option that
>suppresses this one warning; people can then write something like
>
>CC="gcc -Wno-check-include-order" ./configure ...
>
>to get around the problem.
>
>However, if this warning appears, it is likely that the programs in
>question won't build properly on OSes that ship bad C headers, that have
>to be fixed by fixincludes.  In that case, it may well be that the gcc
>command lines will wind up with something like -I/usr/include which means
>that the fixed headers will get bypassed.

Yes, would seem (to me at least) a database of where the fixincluded headers 
came from would allow gcc to substitute them back in when you pass a -I like 
that. (I dont see any significant performance issue, is there possibility 
that people Really want to overide the fixincludes? - in which case there 
could be a -fallow-fixincludes-overide?).
(Also, last time i checked gcc produces that warning for Any directories 
which are considered internal, rather than Just the direectories where the 
fixincluded headers came from! - I compile gcc with --prefix=$HOME on my OSF 
alpha box since i dont have priviledges for /usr or /usr/local - and even 
though, all the headers in my home directory are entirely from application 
install, $HOME/include was the biggest cause of warnings i experienced. - I 
havent compiled much with my latest gcc cvs version yet so maybe that has 
changed.)

Idealy in my mind - autoconf would make configure scripts that Warn users if 
such warnings turned up, but ignore them otherwise.

However, I am a humble user, my opinions are from a very limited sphere of 
use.

Gareth

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gcc 3.2's cpp breaks configure scripts

[Jeff Garzik]

cpp is spitting out a warning about changing the search order of include 
directories, and this is breaking a _ton_ of configure scripts.  I found 
this when I started rebuilding Mandrake with gcc-3.2 branch.

Just a heads-up, since I'm too slack to file a formal bug report :) 
This is particularly subtle breakage sometimes, because sometimes the 
configure step will succeed, but the build will break, or lack features, 
due to the lack of HAVE_FOO_H defines.

Usually the

Example from htdig's config.log:
[...snip...]
configure:3197: checking for zlib.h
configure:3207: gcc -E  -I/usr/include conftest.c >/dev/null 2>conftest.out
cpp0: warning: changing search order for system directory "/usr/include"
cpp0: warning:   as it has already been specified as a non-system directory
configure: failed program was:
#line 3202 "configure"
#include "confdefs.h"
#include <zlib.h>
[...snip...]



Example from lynx's config.log:
[...snip...]
configure:8814: checking for fcntl.h
configure:8824: gcc -E  -I../intl -D_GNU_SOURCE  -DLINUX -I/usr/include 
conftest
.c >/dev/null 2>conftest.out
cpp0: warning: changing search order for system directory "/usr/include"
cpp0: warning:   as it has already been specified as a non-system directory
configure: failed program was:
#line 8819 "configure"
#include "confdefs.h"
#include <fcntl.h>
[...snip...]



gcc version info:
Reading specs from /usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.2/specs
Configured with: ../configure --prefix=/usr --libdir=/usr/lib 
--with-slibdir=/lib --mandir=/usr/share/man --infodir=/usr/share/info 
--enable-shared --enable-threads=posix --disable-checking 
--enable-long-long --enable-__cxa_atexit 
--enable-languages=c,c++,ada,f77,objc,java 
--host=i586-mandrake-linux-gnu --with-system-zlib --with-cpu=athlon
Thread model: posix
gcc version 3.2 (Mandrake Linux 9.0 3.2-0.2mdk)

Re: gcc 3.2's cpp breaks configure scripts

[Gareth Pearce]

----- Original Message -----
From: "Jeff Garzik" <jgarzik@mandrakesoft.com>
To: <gcc@gcc.gnu.org>
Sent: Wednesday, July 31, 2002 10:22 PM
Subject: gcc 3.2's cpp breaks configure scripts


> cpp is spitting out a warning about changing the search order of include
> directories, and this is breaking a _ton_ of configure scripts.  I found
> this when I started rebuilding Mandrake with gcc-3.2 branch.
>
This, from what little i have seen, seems to be due to the fact that many
configure scripts segments are extremely overly picky.  They take any output
at all as to mean that its failed.  Really it should seem to me that they
should be looking for errors, or specific warnings rather then just anything
at all.  However this would take more effort on the configure scripts part
and maybe even slow them down even more... Prehaps there needs to be a
compiler error/warning standard :P

Gareth

Re: gcc 3.2's cpp breaks configure scripts

[Joe Buck]

> > cpp is spitting out a warning about changing the search order of include
> > directories, and this is breaking a _ton_ of configure scripts.  I found
> > this when I started rebuilding Mandrake with gcc-3.2 branch.

Gareth Pearce writes:
> This, from what little i have seen, seems to be due to the fact that many
> configure scripts segments are extremely overly picky.  They take any output
> at all as to mean that its failed.  Really it should seem to me that they
> should be looking for errors, or specific warnings rather then just anything
> at all.

Just the same, it's a lot to ask the distributors of GNU/Linux and BSD
systems to fix every configure script in the world.

Maybe a workaround for the time being is to have a gcc option that
suppresses this one warning; people can then write something like

CC="gcc -Wno-check-include-order" ./configure ...

to get around the problem.

However, if this warning appears, it is likely that the programs in
question won't build properly on OSes that ship bad C headers, that have
to be fixed by fixincludes.  In that case, it may well be that the gcc
command lines will wind up with something like -I/usr/include which means
that the fixed headers will get bypassed.

Re: gcc 3.2's cpp breaks configure scripts

[Phil Edwards]

On Wed, Jul 31, 2002 at 09:45:39AM -0700, Joe Buck wrote:
> Just the same, it's a lot to ask the distributors of GNU/Linux and BSD
> systems to fix every configure script in the world.
> 
> Maybe a workaround for the time being is to have a gcc option that
> suppresses this one warning; people can then write something like
> 
> CC="gcc -Wno-check-include-order" ./configure ...
> 
> to get around the problem.

Yes, please.  I'm very annoyed that GCC prints warnings that I cannot disable
when I /know/ that they are false or harmless.

I'm wrestling with my development machine at the moment (sysadmin issues),
but once it is working again, I will work up such a patch if there is a
consensus that it would be worthwhile.  (And if we can agree on option
spelling.)


Phil

-- 
If ye love wealth greater than liberty, the tranquility of servitude greater
than the animating contest for freedom, go home and leave us in peace.  We seek
not your counsel, nor your arms.  Crouch down and lick the hand that feeds you;
and may posterity forget that ye were our countrymen.            - Samuel Adams

Re: gcc 3.2's cpp breaks configure scripts

[Neil Booth]

Phil Edwards wrote:-

> On Wed, Jul 31, 2002 at 09:45:39AM -0700, Joe Buck wrote:
> > Just the same, it's a lot to ask the distributors of GNU/Linux and BSD
> > systems to fix every configure script in the world.
> > 
> > Maybe a workaround for the time being is to have a gcc option that
> > suppresses this one warning; people can then write something like
> > 
> > CC="gcc -Wno-check-include-order" ./configure ...
> > 
> > to get around the problem.
> 
> Yes, please.  I'm very annoyed that GCC prints warnings that I cannot disable
> when I /know/ that they are false or harmless.
> 
> I'm wrestling with my development machine at the moment (sysadmin issues),
> but once it is working again, I will work up such a patch if there is a
> consensus that it would be worthwhile.  (And if we can agree on option
> spelling.)

Please, not more switches.  Let's either fix the warning, agree its
correct, or get rid of it.

Neil.

Re: gcc 3.2's cpp breaks configure scripts

[Phil Edwards]

On Thu, Aug 01, 2002 at 07:13:39PM +0100, Neil Booth wrote:
> Phil Edwards wrote:-
> > Yes, please.  I'm very annoyed that GCC prints warnings that I cannot disable
> > when I /know/ that they are false or harmless.
> > 
> > I'm wrestling with my development machine at the moment (sysadmin issues),
> > but once it is working again, I will work up such a patch if there is a
> > consensus that it would be worthwhile.  (And if we can agree on option
> > spelling.)
> 
> Please, not more switches.

Fair enough.

> Let's either fix the warning, agree its
> correct, or get rid of it.

Well, you know my opinion.  :-)  I vote for (C).


Phil

-- 
If ye love wealth greater than liberty, the tranquility of servitude greater
than the animating contest for freedom, go home and leave us in peace.  We seek
not your counsel, nor your arms.  Crouch down and lick the hand that feeds you;
and may posterity forget that ye were our countrymen.            - Samuel Adams

Re: gcc 3.2's cpp breaks configure scripts

[Andreas Schwab]

Jeff Garzik <jgarzik@mandrakesoft.com> writes:

|> cpp is spitting out a warning about changing the search order of include
|> directories, and this is breaking a _ton_ of configure scripts.  I found
|> this when I started rebuilding Mandrake with gcc-3.2 branch.
|> 
|> Just a heads-up, since I'm too slack to file a formal bug report :) This
|> is particularly subtle breakage sometimes, because sometimes the configure
|> step will succeed, but the build will break, or lack features, due to the
|> lack of HAVE_FOO_H defines.

The Right Thing to do is not to add -I/usr/include because that can cause
subtle breakage as well.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 Nürnberg
Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: gcc 3.2's cpp breaks configure scripts

[Jeff Garzik]

Andreas Schwab wrote:
> Jeff Garzik <jgarzik@mandrakesoft.com> writes:
> 
> |> cpp is spitting out a warning about changing the search order of include
> |> directories, and this is breaking a _ton_ of configure scripts.  I found
> |> this when I started rebuilding Mandrake with gcc-3.2 branch.
> |> 
> |> Just a heads-up, since I'm too slack to file a formal bug report :) This
> |> is particularly subtle breakage sometimes, because sometimes the configure
> |> step will succeed, but the build will break, or lack features, due to the
> |> lack of HAVE_FOO_H defines.
> 
> The Right Thing to do is not to add -I/usr/include because that can cause
> subtle breakage as well.


Oh, agreed.  And most of the major packages, KDE and GNOME and basic GNU 
tools, get it right.  They've been doing configure scripts for a while, 
and have a clue.

Unfortunately this leaves a lot of minor packages out there set up by 
people not so familiar with configure.

Oh well :)

	Jeff

Re: gcc 3.2's cpp breaks configure scripts

[Jan-Benedict Glaw]

[-- Attachment #1: Type: text/plain, Size: 1078 bytes --]

On Wed, 2002-07-31 09:24:26 -0400, Jeff Garzik <jgarzik@mandrakesoft.com>
wrote in message <3D47E50A.2030004@mandrakesoft.com>:
> Andreas Schwab wrote:
> >Jeff Garzik <jgarzik@mandrakesoft.com> writes:
[...]
> Unfortunately this leaves a lot of minor packages out there set up by 
> people not so familiar with configure.

Well... Having used autoconf/automake only _once_ myself, I can tell
that it's quite hard to work with it. I've not really understood its
concepts, I've not really found good/comprehensive documentation.

Even a _mentioned_ script helping to get the beginning right wasn't
exactly easy to find. If there was more documentation available showing
experienced programmers (and Makefile writers) how to use it would be
an enormeous advantage...

So for these days, I only use the './configure' part of it, no real clue
of how to create all the macros around it...

MfG, JBG

-- 
Jan-Benedict Glaw   .   jbglaw@lug-owl.de   .   +49-172-7608481
	 -- New APT-Proxy written in shell script --
	   http://lug-owl.de/~jbglaw/software/ap2/

[-- Attachment #2: Type: application/pgp-signature, Size: 189 bytes --]

Re: gcc 3.2's cpp breaks configure scripts

[Michael Matz]

Hi,

On Wed, 31 Jul 2002, Jan-Benedict Glaw wrote:

>
> Well... Having used autoconf/automake only _once_ myself, I can tell
> that it's quite hard to work with it. I've not really understood its
> concepts, I've not really found good/comprehensive documentation.

Although this gets OT quickly, autoconf and automake come with extensive
documentation in form of info pages.


Ciao,
Michael.

Re: gcc 3.2's cpp breaks configure scripts

[Kai Henningsen]

matz@suse.de (Michael Matz)  wrote on 31.07.02 in <Pine.LNX.4.33.0207311553070.31138-100000@wotan.suse.de>:

> On Wed, 31 Jul 2002, Jan-Benedict Glaw wrote:
>
> >
> > Well... Having used autoconf/automake only _once_ myself, I can tell
> > that it's quite hard to work with it. I've not really understood its
> > concepts, I've not really found good/comprehensive documentation.
>
> Although this gets OT quickly, autoconf and automake come with extensive
> documentation in form of info pages.

Yeah, but those docs are much better as a reference than as a tutorial.  
IMAO, they are pretty much useless as a tutorial.

And if you look at existing uses, that certainly shows lots and lots of  
pure cargo-cult programming. I'd say that by far most autoconf users don't  
understand their tool.

MfG Kai

Re: gcc 3.2's cpp breaks configure scripts

[Kevin Handy]

Kai Henningsen wrote:

>matz@suse.de (Michael Matz)  wrote on 31.07.02 in <Pine.LNX.4.33.0207311553070.31138-100000@wotan.suse.de>:
>
>  
>
>>On Wed, 31 Jul 2002, Jan-Benedict Glaw wrote:
>>
>>    
>>
>>>Well... Having used autoconf/automake only _once_ myself, I can tell
>>>that it's quite hard to work with it. I've not really understood its
>>>concepts, I've not really found good/comprehensive documentation.
>>>      
>>>
>>Although this gets OT quickly, autoconf and automake come with extensive
>>documentation in form of info pages.
>>    
>>
>
>Yeah, but those docs are much better as a reference than as a tutorial.  
>IMAO, they are pretty much useless as a tutorial.
>
>And if you look at existing uses, that certainly shows lots and lots of  
>pure cargo-cult programming. I'd say that by far most autoconf users don't  
>understand their tool.
>
>MfG Kai
>  
>

There is a book on autoconf and automake

> http://sources.redhat.com/autobook/

It's a couple of years old though.

Re: gcc 3.2's cpp breaks configure scripts

[Kai Henningsen]

schwab@suse.de (Andreas Schwab)  wrote on 31.07.02 in <jeheig3uzb.fsf@sykes.suse.de>:

> Jeff Garzik <jgarzik@mandrakesoft.com> writes:
>
> |> cpp is spitting out a warning about changing the search order of include
> |> directories, and this is breaking a _ton_ of configure scripts.  I found
> |> this when I started rebuilding Mandrake with gcc-3.2 branch.
> |>
> |> Just a heads-up, since I'm too slack to file a formal bug report :) This
> |> is particularly subtle breakage sometimes, because sometimes the
> |> configure step will succeed, but the build will break, or lack features,
> |> due to the lack of HAVE_FOO_H defines.
>
> The Right Thing to do is not to add -I/usr/include because that can cause
> subtle breakage as well.

Or maybe the right thing is to fix autoconf so that it doesn't think a  
warning is a fatal error.

I'd consider that a pretty serious (and really inexcusable) autoconf bug.

MfG Kai

Re: gcc 3.2's cpp breaks configure scripts

[Joe Buck]

> > The Right Thing to do is not to add -I/usr/include because that can cause
> > subtle breakage as well.
> 
> Or maybe the right thing is to fix autoconf so that it doesn't think a  
> warning is a fatal error.

The problem is that there are very large numbers of GNU and other freeware
packages out there with this defect in their autoconf files.  When we
release 3.2, people are going to have a bear of a time building
distributions.  It will be seen as a gcc problem, even if a good argument
can be made that it is an autoconf problem.

Re: gcc 3.2's cpp breaks configure scripts

[Roger Corman]

On Thu, Aug 01, 2002 at 02:47:40PM -0700, Joe Buck wrote:
> 
> > > The Right Thing to do is not to add -I/usr/include because that can cause
> > > subtle breakage as well.
> > 
> > Or maybe the right thing is to fix autoconf so that it doesn't think a  
> > warning is a fatal error.
> 
> The problem is that there are very large numbers of GNU and other freeware
> packages out there with this defect in their autoconf files.  When we
> release 3.2, people are going to have a bear of a time building
> distributions.  It will be seen as a gcc problem, even if a good argument
> can be made that it is an autoconf problem.

    It seems somewhat ludicrous that the idea of an option to disable
the spewing of the message, which breaks a significant number of
configure scripts, is shunned.  "Let's break lots of code and expect
everyone else to fix their stuff and not provide any sort of work
around".  Pretty pathetic.

Re: gcc 3.2's cpp breaks configure scripts

[Joe Buck]

Roger Corman writes:
>     It seems somewhat ludicrous that the idea of an option to disable
> the spewing of the message, which breaks a significant number of
> configure scripts, is shunned.  "Let's break lots of code and expect
> everyone else to fix their stuff and not provide any sort of work
> around".  Pretty pathetic.

It does appear to be one of the few gcc warnings that cannot be suppressed
by any means; it will appear unconditionally.  This breakage may be bad
enough that distributors will come up with their own patch, otherwise how
can they hope to put together a distribution with 500 distinct examples of
this breakage.

How about this idea: an option that tells gcc simply to ignore any -I
lines that refer to system directories.  This seems to me to be exactly
what is wanted for gcc command lines generated by configure.  If such an
option existed,

CC="gcc -fignore-system-include-dirs" configure

would work.  The effect of

(csh/tcsh users would type

env CC="gcc -fignore-system-include-dirs" configure

)

Then

gcc -fignore-system-include-dirs -I/usr/include -I/some/place -O2 -c foo.c

would simply be identical to

gcc -I/some/place -O2 -c foo.c

Sure, it's a hack, but it will allow people to build old apps.  The
nice thing about this is that it will avoid the problems that motivated
the warning in the first place, that is, that if the search order for
system directories is changed things like #include_next break and
fixincluded headers can be bypassed.

gcc-64 on HP-UX 11.00

[H.Merijn Brand]

As I've seen on the gcc web site, HP-UX 11.00 has been promoted to primary
target site. I've got no trouble building gcc in 32 bit mode, but building a
64bit gcc is still almost impossible.

Is there a preferred way to build from the latest snapshot? Do you want more
specific messages about the problems?

I'm not into the gcc sources, but somehow I seem to be willing to function as
a compile farm.

I've got

	The latest HP-UX 11.00 with the latest patches
	The latest C compiler (B.11.11.04 HP C/ANSI C Compiler)
	Several ports of gcc
		3.0.4/32
		3.0.1/64
		3.0.2/64
	binutils-2.11.90/64
	binutils-2.12/64

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.7.3 & 631 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
  WinNT 4, Win2K pro & WinCE 2.11.  Smoking perl CORE: smokers@perl.org
http://archives.develooper.com/daily-build@perl.org/   perl-qa@perl.org
send smoke reports to: smokers-reports@perl.org, QA: http://qa.perl.org

Re: gcc-64 on HP-UX 11.00

[law]

In message <20020404113717.E7B3.H.M.BRAND@hccnet.nl>, "H.Merijn Brand" writes:
 > As I've seen on the gcc web site, HP-UX 11.00 has been promoted to primary
 > target site. I've got no trouble building gcc in 32 bit mode, but building a
 > 64bit gcc is still almost impossible.
Correct.  32bit builds should go fine.  64bit builds are a pain.


 > Is there a preferred way to build from the latest snapshot? Do you want more
 > specific messages about the problems?
The preferred way is to always have a previous 64bit compiler available --
building the 64bit PA tools is exceedingly hard using a 32bit GCC or
the HP provided compilers.

Even if you have 64bit PA tools, you're going to run into problems as that
toolchain doesn't receive nearly the attention that the 32bit toolchain 
receives.

jeff

Re: gcc-64 on HP-UX 11.00

[H.Merijn Brand]

[-- Attachment #1: Type: text/plain, Size: 11620 bytes --]

On Thu 04 Apr 2002 21:58, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> > As I've seen on the gcc web site, HP-UX 11.00 has been promoted to primary
> > target site. I've got no trouble building gcc in 32 bit mode, but building a
> > 64bit gcc is still almost impossible.
> 
> Can you be more specific?  I think that once you get a good set of tools
> installed you won't have any trouble building 64bit gcc.  This is not to

Then my tools are probably no good ;)

> say that that there aren't lots of issues with hppa64 but I am not having
> problems doing builds anymore.

But you might have /more/ GNU stuff installed in default locations than I have.
For example, in the configuration I'll show shortly, it barfs on unsatisfied
symbol '__umoddi3', which can be found in libgcc.a, which I do not have
installed in a default location, and since I'm building with HPc, it won't
find it without hints. Now if I set LDFLAGS="-L/usr/local/pa20_64/lib -lgcc"
where libgcc can be found in my situation, it is put *before* the libs, making
the needed symbols unfindable, so I commented out LDFLAGS and put in
LIBS=/usr/local/pa20_64/lib/libgcc.a

FYI when reading on, /usr/local/pa20_64 is a symlink to /wrk/pa20_64 because
    that LV has more space to play with.

> > I've got
> > 
> >	The latest HP-UX 11.00 with the latest patches
> > 	The latest C compiler (B.11.11.04 HP C/ANSI C Compiler)
> > 	Several ports of gcc
> > 		3.0.4/32
> > 		3.0.1/64
> > 		3.0.2/64
> > 	binutils-2.11.90/64
> > 	binutils-2.12/64
> 
> Here are my suggestions.  Use the latest binutils.  It has fixes that
> affect hppa64.  Don't use 2.11.90.  Build it with the HP ANSI compiler
> (ie, use "-Ae +DA2.0W" in your CFLAGS).  Gcc may miscompile the
> linker causing it to dump core linking shared libraries.  Whether
> this is still a problem, I'm not sure.

I used
--8<--- Conf-64
#!/usr/bin/sh

export CONFIG_SITE=
export CC=cc
export CFLAGS="-Ae -O +DA2.0W"
#export LDFLAGS="-L/usr/local/pa20_64/lib -lgcc"
export LIBS=/usr/local/pa20_64/lib/libgcc.a
export PATH=.
export PATH=$PATH"":/u/usr/merijn/bin/private:/u/usr/merijn/bin
export PATH=$PATH"":/pro/local/bin:/pro/bin
export PATH=$PATH"":/usr/bin:/usr/bin/X11:/opt/ansic/bin
export PATH=$PATH"":/usr/sbin:/etc:/sbin:/usr/lib:/usr/ccs/bin:/opt/langtools/bin
export PATH=$PATH"":/usr/contrib/bin:/usr/contrib/bin/X11:/opt/imake/bin

configure \
    --prefix=/wrk/pa20_64 --with-local-prefix=/wrk/pa20_64 \
    --disable-shared \
    --disable-nls \
    --enable-multilib \
    --enable-threads
-->8---

But needed the followin patches:
--8<--- binutils-2.12.diff
--- binutils-2.12.org/configure.in	2002-03-08 20:45:10.000000000 +0100
+++ binutils-2.12/configure.in	2002-04-05 13:17:26.000000000 +0200
@@ -722,8 +722,10 @@
   hppa*-*-*elf* | \
   hppa*-*-linux-gnu* | \
   hppa*-*-lites* | \
+  hppa*2.0w*-*-* | \
   hppa*64*-*-*)
     # Do configure ld/binutils/gas for this case.
+    echo " #############   64bit   ################### ($noconfigdirs)" >&2
     ;;
   hppa*-*-*)
     # HP's C compiler doesn't handle Emacs correctly (but on BSD and Mach
--- binutils-2.12.org/bfd/config.bfd	2002-02-13 21:45:46.000000000 +0100
+++ binutils-2.12/bfd/config.bfd	2002-04-05 13:10:23.000000000 +0200
@@ -292,6 +292,7 @@
     targ_defvec=bfd_elf64_hppa_linux_vec
     targ_selvecs=bfd_elf64_hppa_vec
     ;;
+  hppa*2.0w*-*-hpux11* | \
   hppa*64*-*-hpux11*)
     targ_defvec=bfd_elf64_hppa_vec
     targ_selvecs=bfd_elf64_hppa_linux_vec
--- binutils-2.12.org/bfd/configure.host	2002-01-22 01:47:21.000000000 +0100
+++ binutils-2.12/bfd/configure.host	2002-04-05 13:10:41.000000000 +0200
@@ -21,6 +21,7 @@
 
 alpha*-*-*)		host64=true; HOST_64BIT_TYPE=long ;;
 
+hppa*2.0w*-*-hpux* | \
 hppa*64*-*-hpux*)	HDEFINES=-DHOST_HPPAHPUX;
 			host64=true; HOST_64BIT_TYPE=long ;;
 hppa*-*-hpux*)		HDEFINES=-DHOST_HPPAHPUX ;;
--- binutils-2.12.org/gas/configure	2002-02-26 11:35:27.000000000 +0100
+++ binutils-2.12/gas/configure	2002-04-05 13:11:01.000000000 +0200
@@ -2377,6 +2377,7 @@
       hppa-*-osf*)          fmt=som em=hppa ;;
       hppa-*-rtems*)        fmt=elf em=hppa ;;
       hppa-*-hpux11*)	    case ${cpu} in
+				hppa*2.0w* | \
 				hppa*64*)
 					fmt=elf em=hppa64 ;;
 				hppa*)
--- binutils-2.12.org/gas/configure.in	2002-02-26 11:35:27.000000000 +0100
+++ binutils-2.12/gas/configure.in	2002-04-05 13:11:17.000000000 +0200
@@ -227,6 +227,7 @@
       hppa-*-osf*)          fmt=som em=hppa ;;
       hppa-*-rtems*)        fmt=elf em=hppa ;;
       hppa-*-hpux11*)	    case ${cpu} in
+				hppa*2.0w* | \
 				hppa*64*)
 					fmt=elf em=hppa64 ;;
 				hppa*)
--- binutils-2.12.org/ld/configure.tgt	2002-02-20 06:26:22.000000000 +0100
+++ binutils-2.12/ld/configure.tgt	2002-04-05 13:07:56.000000000 +0200
@@ -309,6 +309,7 @@
 m68*-*-rtemscoff*)	targ_emul=m68kcoff ;;
 m68*-*-rtems*)		targ_emul=m68kelf ;;
 hppa*64*-*-linux-gnu*)	targ_emul=hppa64linux ;;
+hppa*2.0w*-*)		targ_emul=elf64hppa ;;
 hppa*64*-*)		targ_emul=elf64hppa ;;
 hppa*-*-linux-gnu*)	targ_emul=hppalinux ;;
 hppa*-*-*elf*)		targ_emul=hppaelf ;;
-->8---

Conf-64 now finishes to the end.

Now I use
--8<--- Build-64
#!/usr/bin/sh

export CONFIG_SITE=
export CC=cc
export CFLAGS="-Ae -O +DA2.0W"
#export LDFLAGS="-L/usr/local/pa20_64/lib -lgcc"
export LIBS=/usr/local/pa20_64/lib/libgcc.a
export PATH=.
export PATH=$PATH"":/u/usr/merijn/bin/private:/u/usr/merijn/bin
export PATH=$PATH"":/pro/local/bin:/pro/bin
export PATH=$PATH"":/usr/bin:/usr/bin/X11:/opt/ansic/bin
export PATH=$PATH"":/usr/sbin:/etc:/sbin:/usr/lib:/usr/ccs/bin:/opt/langtools/bin
export PATH=$PATH"":/usr/contrib/bin:/usr/contrib/bin/X11:/opt/imake/bin

make
-->8---

After the first run I changed 'make' to 'make -i' and reran
the log is attached

a5:/wrk/pa20_64/bin 189 > find * -newer ld.pl -type f | xargs file
addr2line:      ELF-64 executable object file - PA-RISC 2.0 (LP64)
ar:             ELF-64 executable object file - PA-RISC 2.0 (LP64)
as:             ELF-64 executable object file - PA-RISC 2.0 (LP64)
c++filt:        ELF-64 executable object file - PA-RISC 2.0 (LP64)
gas:            ELF-64 executable object file - PA-RISC 2.0 (LP64)
gasp:           ELF-64 executable object file - PA-RISC 2.0 (LP64)
gprof:          ELF-64 executable object file - PA-RISC 2.0 (LP64)
ld:             ELF-64 executable object file - PA-RISC 2.0 (LP64)
nm:             ELF-64 executable object file - PA-RISC 2.0 (LP64)
objcopy:        ELF-64 executable object file - PA-RISC 2.0 (LP64)
objdump:        ELF-64 executable object file - PA-RISC 2.0 (LP64)
ranlib:         ELF-64 executable object file - PA-RISC 2.0 (LP64)
readelf:        ELF-64 executable object file - PA-RISC 2.0 (LP64)
size:           ELF-64 executable object file - PA-RISC 2.0 (LP64)
strings:        ELF-64 executable object file - PA-RISC 2.0 (LP64)
strip:          ELF-64 executable object file - PA-RISC 2.0 (LP64)
a5:/wrk/pa20_64/bin 190 >

Now I should have a working set of binutils, I guess (FTR, I built my previous
set with gcc-3.0.2/64)

> For gcc, use either the 3.1 branch or the unstable 3.2 trunk.  You

I'll go for the gcc-20020401.tar.bz2 version I snatched from snapshot

> should be able to bootstrap it using CC="cc -Ae +DA2.0W" or with
> a working version of gcc for hppa64.  Use the GNU binutils and specify
> the locations for as and ld using --with-as and --with-ld.  Run
> the testsuite to see if things are working.  There are some problems
> with shared libraries so it's probably better not to specify
> --enable-shared in your configure options.
> 
> These are the gcc configure options that I use:
> 
> --host=hppa64-hp-hpux11.11 --with-gnu-as --with-as=/opt/gnu64/bin/as
  
  That's a HP-UX 11i
  
> --with-gnu-ld --with-ld=/opt/gnu64/bin/ld --disable-nls --prefix=/opt/gnu64

This is what I went for
--8<--- Conf-64
#!/usr/bin/sh

export CONFIG_SITE=
export CC="cc -Ae +DA2.0W"
export PATH=.:/u/usr/merijn/bin/private:/u/usr/merijn/bin
export PATH=$PATH"":/pro/local/bin:/pro/bin:/usr/bin:/usr/bin/X11
export PATH=$PATH"":/opt/ansic/bin:/usr/ccs/bin:/opt/langtools/bin
export PATH=$PATH"":/usr/lib:/usr/contrib/bin:/usr/contrib/bin/X11:/opt/imake/bin
export PATH=$PATH"":/wrk/pa20_64/bin:/wrk/GNUpro/bin

rm -rf obj
mkdir obj
cd obj
../src/configure \
    --enable-languages=gcc \
    --prefix=/usr/local/pa20_64 --with-local-prefix=/usr/local/pa20_64 \
    --with-gnu-as \
    --with-gnu-ld \
    --disable-shared \
    --disable-nls \
    --enable-multilib \
    --enable-threads \
    --with-system-zlib

echo ""
echo "Now start 'Build-64'"
-->8---

Of course after patchin with
--8<---
--- src/configure.in.org	2002-04-05 14:16:10.000000000 +0200
+++ src/configure.in	2002-04-05 14:16:31.000000000 +0200
@@ -284,6 +284,7 @@
 # hpux11 in 64bit mode has libraries in a weird place.  Arrange to find
 # them automatically.
 case "${host}" in
+  hppa*2.0w*-*-hpux11* | \
   hppa*64*-*-hpux11*)	
     withoptions="$withoptions -x-libraries=/usr/lib/pa20_64 -x-includes=/usr/X11R6/include"
     ;;
@@ -567,6 +568,7 @@
 noconfigdirs=""
 
 case "${host}" in
+  hppa*2.0w*-*-* |\
   hppa*64*-*-*)
     noconfigdirs="$noconfigdirs byacc"
     ;;
@@ -771,6 +773,7 @@
   hppa*-*-*elf* | \
   parisc*-*-linux* | hppa*-*-linux* | \
   hppa*-*-lites* | \
+  hppa*2.0w*-*-* | \
   hppa*64*-*-*)
     noconfigdirs="$noconfigdirs ${libgcj}"
     # Do configure ld/binutils/gas for this case.
--- src/gcc/config.gcc.org	2002-04-05 14:14:51.000000000 +0200
+++ src/gcc/config.gcc	2002-04-05 14:14:58.000000000 +0200
@@ -917,6 +917,7 @@
 	install_headers_dir=install-headers-cpio
 	use_collect2=yes
 	;;
+hppa*2.0w*-*-hpux11* | \
 hppa*64*-*-hpux11*)
 	xm_defines=POSIX
 	tm_file="pa/pa64-start.h ${tm_file} pa/pa64-regs.h pa/long_double.h pa/elf.h pa/pa-hpux.h pa/pa-hpux11.h pa/pa-64.h pa/pa64-hpux.h"
-->8---

Now I use
--8<--- Build-64
#!/usr/bin/sh

export CONFIG_SITE=
export CC="cc -Ae +DA2.0W"
export PATH=.:/u/usr/merijn/bin/private:/u/usr/merijn/bin
export PATH=$PATH"":/pro/local/bin:/pro/bin:/usr/bin:/usr/bin/X11
export PATH=$PATH"":/opt/ansic/bin:/usr/ccs/bin:/opt/langtools/bin
export PATH=$PATH"":/usr/lib:/usr/contrib/bin:/usr/contrib/bin/X11:/opt/imake/bin
export PATH=$PATH"":/wrk/pa20_64/bin:/wrk/GNUpro/bin

cd obj
make bootstrap-lean
-->8---

The build comes amazingly far, but core dumps like

echo "int xxy_us_dummy;" >tmp-dum.c
./xgcc -B./ -B/usr/local/pa20_64/hppa2.0w-hp-hpux11.00/bin/ -isystem /usr/local/pa20_64/hppa2.0w-hp-hpux11.00/include -isystem /usr/local/pa20_64/hppa2.0w-hp-hpux11.00/sys-include -S tmp-dum.c
cc1: internal error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
make[2]: *** [s-under] Error 1
make[2]: Leaving directory `/pro/3gl/GNU/gcc-3.0.4/obj/gcc'
make[1]: *** [stage2_build] Error 2
make[1]: Leaving directory `/pro/3gl/GNU/gcc-3.0.4/obj/gcc'
make: *** [bootstrap-lean] Error 2

No core dump.

Should I go on?

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.7.3 & 631 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
  WinNT 4, Win2K pro & WinCE 2.11.  Smoking perl CORE: smokers@perl.org
http://archives.develooper.com/daily-build@perl.org/   perl-qa@perl.org
send smoke reports to: smokers-reports@perl.org, QA: http://qa.perl.org

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Re: gcc-64 on HP-UX 11.00

[H.Merijn Brand]

[-- Attachment #1: Type: text/plain, Size: 385 bytes --]

On Fri 05 Apr 2002 14:49, H.Merijn Brand <h.m.brand@hccnet.nl> wrote:

Log for gcc was missing

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.7.3 & 631 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
     WinNT 4, Win2K pro & WinCE 2.11 often with Tk800.024 &/| DBD-Unify
ftp://ftp.funet.fi/pub/languages/perl/CPAN/authors/id/H/HM/HMBRAND/


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Re: gcc-64 on HP-UX 11.00

[John David Anglin]

> > Can you be more specific?  I think that once you get a good set of tools
> > installed you won't have any trouble building 64bit gcc.  This is not to
> 
> Then my tools are probably no good ;)

From your comments below, I would say they are incorrectly installed.

> 
> > say that that there aren't lots of issues with hppa64 but I am not having
> > problems doing builds anymore.
> 
> But you might have /more/ GNU stuff installed in default locations than I h=
> ave.
> For example, in the configuration I'll show shortly, it barfs on unsatisfie=
> d
> symbol '__umoddi3', which can be found in libgcc.a, which I do not have
> installed in a default location, and since I'm building with HPc, it won't
> find it without hints. Now if I set LDFLAGS=3D"-L/usr/local/pa20_64/lib -lg=
> cc"

If you use HP cc, libgcc.a should not be needed.  It gets built in stage1
by ./xgcc and then installed with the compiler.

You need to select a prefix to install your 64-bit tools in (e.g., /opt/gnu64).
The prefix can be anywhere but I keep the 64-bit stuff separate from 32-bit
som stuff.  I build and install my 64-bit binutils tools to the same
directory and have /opt/gnu64/bin as the first component in PATH to ensure
that 64-bit tools are used when I do a 64-bit build.

You should not have to play with LDFLAGS to bootstrap the compiler.

Regarding tools, suggest using GNU make.  You should install a 64-bit
versions of binutils.  It may also be useful to build bash, bison, gawk,
texinfo, perl, sed, and possibly autoconf (2.13).  You can build these
with either the HP compiler or 32-bit gcc.

> where libgcc can be found in my situation, it is put *before* the libs, mak=
> ing
> the needed symbols unfindable, so I commented out LDFLAGS and put in
> LIBS=3D/usr/local/pa20_64/lib/libgcc.a
> 
> FYI when reading on, /usr/local/pa20_64 is a symlink to /wrk/pa20_64 becaus=
> e
>     that LV has more space to play with.
> 
> > > I've got
> > >=20
> > >	The latest HP-UX 11.00 with the latest patches
> > > 	The latest C compiler (B.11.11.04 HP C/ANSI C Compiler)
> > > 	Several ports of gcc
> > > 		3.0.4/32
> > > 		3.0.1/64
> > > 		3.0.2/64
> > > 	binutils-2.11.90/64
> > > 	binutils-2.12/64
> >=20
> > Here are my suggestions.  Use the latest binutils.  It has fixes that
> > affect hppa64.  Don't use 2.11.90.  Build it with the HP ANSI compiler
> > (ie, use "-Ae +DA2.0W" in your CFLAGS).  Gcc may miscompile the
> > linker causing it to dump core linking shared libraries.  Whether
> > this is still a problem, I'm not sure.
> 
> I used
> --8<--- Conf-64
> #!/usr/bin/sh
> 
> export CONFIG_SITE=3D
> export CC=3Dcc

Change this to
export CC="cc -Ae +DA2.0W"

> export CFLAGS=3D"-Ae -O +DA2.0W"
> #export LDFLAGS=3D"-L/usr/local/pa20_64/lib -lgcc"
> export LIBS=3D/usr/local/pa20_64/lib/libgcc.a

Delete these.

> export PATH=3D.
> export PATH=3D$PATH"":/u/usr/merijn/bin/private:/u/usr/merijn/bin
> export PATH=3D$PATH"":/pro/local/bin:/pro/bin
> export PATH=3D$PATH"":/usr/bin:/usr/bin/X11:/opt/ansic/bin
> export PATH=3D$PATH"":/usr/sbin:/etc:/sbin:/usr/lib:/usr/ccs/bin:/opt/langt=
> ools/bin
> export PATH=3D$PATH"":/usr/contrib/bin:/usr/contrib/bin/X11:/opt/imake/bin
> 
> configure \
>     --prefix=3D/wrk/pa20_64 --with-local-prefix=3D/wrk/pa20_64 \
>     --disable-shared \
>     --disable-nls \
>     --enable-multilib \
>     --enable-threads

Use a modification of what I sent.  --with-local-prefix probably isn't
needed.  You don't need --enable-multilib or --enable-threads.  There
isn't any thread support yet and no multilibs.

> -->8---
> 

The patch below is incorrect.  The hppa2.0w-hp-hpux11* target is actually
the 32-bit som target on a 2.0w machine.  It shouldn't be changed to
64-bit.  Same for gcc config.

You want to configure binutils with something like

--host=hppa64-hp-hpux11.11 --prefix=/opt/gnu64 --disable-nls

If you are using a 11.00 system --host should be hppa64-hp-hpux11.00.  You
need to specify --host, or a complete set of --host, --build and --target
to do a 64-bit build.  The default guess is for 32-bit tools.

> But needed the followin patches:
> --8<--- binutils-2.12.diff
> --- binutils-2.12.org/configure.in	2002-03-08 20:45:10.000000000 +0100
> +++ binutils-2.12/configure.in	2002-04-05 13:17:26.000000000 +0200
> @@ -722,8 +722,10 @@
>    hppa*-*-*elf* | \
>    hppa*-*-linux-gnu* | \
>    hppa*-*-lites* | \
> +  hppa*2.0w*-*-* | \
>    hppa*64*-*-*)

[...]

> > These are the gcc configure options that I use:
> >=20
> > --host=3Dhppa64-hp-hpux11.11 --with-gnu-as --with-as=3D/opt/gnu64/bin/as
>  =20
>   That's a HP-UX 11i

Yes.  It works identically to 11.00.

>  =20
> > --with-gnu-ld --with-ld=3D/opt/gnu64/bin/ld --disable-nls --prefix=3D/opt=
> /gnu64
> 
> This is what I went for
> --8<--- Conf-64
> #!/usr/bin/sh
> 
> export CONFIG_SITE=3D
> export CC=3D"cc -Ae +DA2.0W"
> export PATH=3D.:/u/usr/merijn/bin/private:/u/usr/merijn/bin
> export PATH=3D$PATH"":/pro/local/bin:/pro/bin:/usr/bin:/usr/bin/X11
> export PATH=3D$PATH"":/opt/ansic/bin:/usr/ccs/bin:/opt/langtools/bin
> export PATH=3D$PATH"":/usr/lib:/usr/contrib/bin:/usr/contrib/bin/X11:/opt/i=
> make/bin
> export PATH=3D$PATH"":/wrk/pa20_64/bin:/wrk/GNUpro/bin

When you do a 64-bit build, make sure that the 64-bit tools are before
the 32-bit and HP tools.  Some have the same name so you want to be sure
that your using the correct tools.  The HP compiler knows how to find
its tools.

> 
> rm -rf obj
> mkdir obj
> cd obj
> =2E./src/configure \
>     --enable-languages=3Dgcc \
>     --prefix=3D/usr/local/pa20_64 --with-local-prefix=3D/usr/local/pa20_64 =
> \
>     --with-gnu-as \
>     --with-gnu-ld \
>     --disable-shared \
>     --disable-nls \
>     --enable-multilib \
>     --enable-threads \
>     --with-system-zlib
> 
> echo ""
> echo "Now start 'Build-64'"
> -->8---
> 

Again, the patch below is wrong and unnecessary.  You need to specify
--host properly.  I suggest removing --enable-multilib, --enable-threads
and --with-system-zlib.  The system zlib probably has the security bug.

>
> Of course after patchin with
> --8<---
> --- src/configure.in.org	2002-04-05 14:16:10.000000000 +0200
> +++ src/configure.in	2002-04-05 14:16:31.000000000 +0200
> @@ -284,6 +284,7 @@
>  # hpux11 in 64bit mode has libraries in a weird place.  Arrange to find
>  # them automatically.
>  case "${host}" in
> +  hppa*2.0w*-*-hpux11* | \
>    hppa*64*-*-hpux11*)=09

[...]

> The build comes amazingly far, but core dumps like
> 
> echo "int xxy_us_dummy;" >tmp-dum.c
> =2E/xgcc -B./ -B/usr/local/pa20_64/hppa2.0w-hp-hpux11.00/bin/ -isystem /usr=
> /local/pa20_64/hppa2.0w-hp-hpux11.00/include -isystem /usr/local/pa20_64/hp=
> pa2.0w-hp-hpux11.00/sys-include -S tmp-dum.c
> cc1: internal error: Segmentation fault

> No core dump.
> 
> Should I go on?

Retry following my suggestions.  The important points are:

1)  Use a common prefix for your tools (e.g., /usr/local/pa20_64).
2)  Use --host=hppa64-hp-hpux11.00.
3)  Export CC="cc -Ae +DA2.0W" for your initial builds of binutils and gcc.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc-64 on HP-UX 11.00

[H.Merijn Brand]

On Fri 05 Apr 2002 18:06, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> > > Can you be more specific?  I think that once you get a good set of tools
> > > installed you won't have any trouble building 64bit gcc.  This is not to
> > 
> > Then my tools are probably no good ;)
> 
> >From your comments below, I would say they are incorrectly installed.
> 
> > 
> > > say that that there aren't lots of issues with hppa64 but I am not having
> > > problems doing builds anymore.
> > 
> > But you might have /more/ GNU stuff installed in default locations than I h=
> > ave.
> > For example, in the configuration I'll show shortly, it barfs on unsatisfie=
> > d
> > symbol '__umoddi3', which can be found in libgcc.a, which I do not have
> > installed in a default location, and since I'm building with HPc, it won't
> > find it without hints. Now if I set LDFLAGS=3D"-L/usr/local/pa20_64/lib -lg=
> > cc"
> 
> If you use HP cc, libgcc.a should not be needed.  It gets built in stage1
> by ./xgcc and then installed with the compiler.

was baffled too.

> You need to select a prefix to install your 64-bit tools in (e.g., /opt/gnu64).

I use /wrk/pa20_64 and have /usr/local/pa20_64 symlinked to it

> The prefix can be anywhere but I keep the 64-bit stuff separate from 32-bit

So do I

> som stuff.  I build and install my 64-bit binutils tools to the same
> directory and have /opt/gnu64/bin as the first component in PATH to ensure
> that 64-bit tools are used when I do a 64-bit build.

Same here

> You should not have to play with LDFLAGS to bootstrap the compiler.

Found that out too.

> Regarding tools, suggest using GNU make.  You should install a 64-bit

GNU make installed as basic make on *ALL* our systems. Native make's just
won't do :)

> versions of binutils.  It may also be useful to build bash, bison, gawk,
> texinfo, perl, sed, and possibly autoconf (2.13).  You can build these
> with either the HP compiler or 32-bit gcc.

bash		only on cywgin (I'm a tcsh addict)
bison		1.34 all over. I'm helping the bison guys with testing on
		HP-UX and AIX, so I guess I must be up to date
gawk		same as make
texinfo		nowhere. I *HATE* the info style of documenting, so I don't
		care if installing info stuff fails. I'd even prefer it to
		fail. I'd love to see it fallback to the good ol' man pages.
perl		hell, I'm a perl5-porter, so I've got several versions up and
		running, and the bleading edge version is smoke tested on all
		systems every day
sed		same as make
autoconf	I *try* to get a recent version installed, but HPUX and AIX
		are not the most wonderfull systems for this package. I /do/
		have these installed, for gcc only.

> > where libgcc can be found in my situation, it is put *before* the libs, mak=
> > ing
> > the needed symbols unfindable, so I commented out LDFLAGS and put in
> > LIBS=3D/usr/local/pa20_64/lib/libgcc.a
> > 
> > FYI when reading on, /usr/local/pa20_64 is a symlink to /wrk/pa20_64 becaus=
> > e
> >     that LV has more space to play with.
> > 
> > > > I've got
> > > >=20
> > > >	The latest HP-UX 11.00 with the latest patches
> > > > 	The latest C compiler (B.11.11.04 HP C/ANSI C Compiler)
> > > > 	Several ports of gcc
> > > > 		3.0.4/32
> > > > 		3.0.1/64
> > > > 		3.0.2/64
> > > > 	binutils-2.11.90/64
> > > > 	binutils-2.12/64
> > >=20
> > > Here are my suggestions.  Use the latest binutils.  It has fixes that
> > > affect hppa64.  Don't use 2.11.90.  Build it with the HP ANSI compiler
> > > (ie, use "-Ae +DA2.0W" in your CFLAGS).  Gcc may miscompile the
> > > linker causing it to dump core linking shared libraries.  Whether
> > > this is still a problem, I'm not sure.
> > 
> > I used
> > --8<-- Conf-64
> > #!/usr/bin/sh
> > 
> > export CONFIG_SITE=3D
> > export CC=3Dcc
> 
> Change this to
> export CC="cc -Ae +DA2.0W"

I will

> > export CFLAGS=3D"-Ae -O +DA2.0W"
> > #export LDFLAGS=3D"-L/usr/local/pa20_64/lib -lgcc"
> > export LIBS=3D/usr/local/pa20_64/lib/libgcc.a
> 
> Delete these.

Consider it done

> > export PATH=3D.
> > export PATH=3D$PATH"":/u/usr/merijn/bin/private:/u/usr/merijn/bin
> > export PATH=3D$PATH"":/pro/local/bin:/pro/bin
> > export PATH=3D$PATH"":/usr/bin:/usr/bin/X11:/opt/ansic/bin
> > export PATH=3D$PATH"":/usr/sbin:/etc:/sbin:/usr/lib:/usr/ccs/bin:/opt/langt=
> > ools/bin
> > export PATH=3D$PATH"":/usr/contrib/bin:/usr/contrib/bin/X11:/opt/imake/bin
> > 
> > configure \
> >     --prefix=3D/wrk/pa20_64 --with-local-prefix=3D/wrk/pa20_64 \
> >     --disable-shared \
> >     --disable-nls \
> >     --enable-multilib \
> >     --enable-threads
> 
> Use a modification of what I sent.  --with-local-prefix probably isn't
> needed.  You don't need --enable-multilib or --enable-threads.  There
> isn't any thread support yet and no multilibs.

Grrr, but at least it proves I read /beyond/ the surface.

> > -->8---
> > 
> 
> The patch below is incorrect.  The hppa2.0w-hp-hpux11* target is actually
> the 32-bit som target on a 2.0w machine.  It shouldn't be changed to
> 64-bit.  Same for gcc config.

An auto-detect, or configure help would be nice then. I /did/ try with
specifying the host like that, but also got stuck somewhere, so I thought this
would be a more clean way to go.

> You want to configure binutils with something like
> 
> --host=hppa64-hp-hpux11.11 --prefix=/opt/gnu64 --disable-nls
> 
> If you are using a 11.00 system --host should be hppa64-hp-hpux11.00.  You
> need to specify --host, or a complete set of --host, --build and --target
> to do a 64-bit build.  The default guess is for 32-bit tools.

Systems are down now, expect some positive message early this week.

> > But needed the followin patches:
> > --8<-- binutils-2.12.diff
> > --- binutils-2.12.org/configure.in	2002-03-08 20:45:10.000000000 +0100
> > +++ binutils-2.12/configure.in	2002-04-05 13:17:26.000000000 +0200
> > @@ -722,8 +722,10 @@
> >    hppa*-*-*elf* | \
> >    hppa*-*-linux-gnu* | \
> >    hppa*-*-lites* | \
> > +  hppa*2.0w*-*-* | \
> >    hppa*64*-*-*)
> 
> [...]
> 
> > > These are the gcc configure options that I use:
> > >=20
> > > --host=3Dhppa64-hp-hpux11.11 --with-gnu-as --with-as=3D/opt/gnu64/bin/as
> >  =20
> >   That's a HP-UX 11i
> 
> Yes.  It works identically to 11.00.
> 
> >  =20
> > > --with-gnu-ld --with-ld=3D/opt/gnu64/bin/ld --disable-nls --prefix=3D/opt=
> > /gnu64
> > 
> > This is what I went for
> > --8<-- Conf-64
> > #!/usr/bin/sh
> > 
> > export CONFIG_SITE=3D
> > export CC=3D"cc -Ae +DA2.0W"
> > export PATH=3D.:/u/usr/merijn/bin/private:/u/usr/merijn/bin
> > export PATH=3D$PATH"":/pro/local/bin:/pro/bin:/usr/bin:/usr/bin/X11
> > export PATH=3D$PATH"":/opt/ansic/bin:/usr/ccs/bin:/opt/langtools/bin
> > export PATH=3D$PATH"":/usr/lib:/usr/contrib/bin:/usr/contrib/bin/X11:/opt/i=
> > make/bin
> > export PATH=3D$PATH"":/wrk/pa20_64/bin:/wrk/GNUpro/bin
> 
> When you do a 64-bit build, make sure that the 64-bit tools are before

They are.

> the 32-bit and HP tools.  Some have the same name so you want to be sure
> that your using the correct tools.  The HP compiler knows how to find
> its tools.

As a side track, how much of what I specify during build is inherited in the
compiler? Can the /wrk/pa20_64 be ported independent of the way I built it?
Does the user that receives the dist need the same as and the same ld or can
it use a different one?

> > 
> > rm -rf obj
> > mkdir obj
> > cd obj
> > =2E./src/configure \
> >     --enable-languages=3Dgcc \
> >     --prefix=3D/usr/local/pa20_64 --with-local-prefix=3D/usr/local/pa20_64 =
> > \
> >     --with-gnu-as \
> >     --with-gnu-ld \
> >     --disable-shared \
> >     --disable-nls \
> >     --enable-multilib \
> >     --enable-threads \
> >     --with-system-zlib
> > 
> > echo ""
> > echo "Now start 'Build-64'"
> > -->8---
> > 
> 
> Again, the patch below is wrong and unnecessary.  You need to specify
> --host properly.  I suggest removing --enable-multilib, --enable-threads
> and --with-system-zlib.  The system zlib probably has the security bug.

No, all my zlib's are up to date. The security bug made me choose for this
option in the first place.

> >
> > Of course after patchin with
> > --8<--
> > --- src/configure.in.org	2002-04-05 14:16:10.000000000 +0200
> > +++ src/configure.in	2002-04-05 14:16:31.000000000 +0200
> > @@ -284,6 +284,7 @@
> >  # hpux11 in 64bit mode has libraries in a weird place.  Arrange to find
> >  # them automatically.
> >  case "${host}" in
> > +  hppa*2.0w*-*-hpux11* | \
> >    hppa*64*-*-hpux11*)=09
> 
> [...]
> 
> > The build comes amazingly far, but core dumps like
> > 
> > echo "int xxy_us_dummy;" >tmp-dum.c
> > =2E/xgcc -B./ -B/usr/local/pa20_64/hppa2.0w-hp-hpux11.00/bin/ -isystem /usr=
> > /local/pa20_64/hppa2.0w-hp-hpux11.00/include -isystem /usr/local/pa20_64/hp=
> > pa2.0w-hp-hpux11.00/sys-include -S tmp-dum.c
> > cc1: internal error: Segmentation fault
> 
> > No core dump.
> > 
> > Should I go on?
> 
> Retry following my suggestions.  The important points are:
> 
> 1)  Use a common prefix for your tools (e.g., /usr/local/pa20_64).
> 2)  Use --host=hppa64-hp-hpux11.00.
> 3)  Export CC="cc -Ae +DA2.0W" for your initial builds of binutils and gcc.

Thanks so far. I'll keep you posted.

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.7.3 & 631 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
  WinNT 4, Win2K pro & WinCE 2.11.  Smoking perl CORE: smokers@perl.org
http://archives.develooper.com/daily-build@perl.org/   perl-qa@perl.org
send smoke reports to: smokers-reports@perl.org, QA: http://qa.perl.org

Re: gcc-64 on HP-UX 11.00

[John David Anglin]

> autoconf	I *try* to get a recent version installed, but HPUX and AIX
> 		are not the most wonderfull systems for this package. I /do/
> 		have these installed, for gcc only.

Install 2.13 for gcc development.  It's only needed if you need to update
configure.  It shouldn't be needed for normal builds if you start from
a snapshot or use contrib/gcc_update.

> As a side track, how much of what I specify during build is inherited in the
> compiler? Can the /wrk/pa20_64 be ported independent of the way I built it?
> Does the user that receives the dist need the same as and the same ld or can
> it use a different one?

They need to be feature compatible.  There are various assembler and linker
checks done by configure.

If you are trying to build with --prefix=/wrk/pa20_64 and install the
final dist to a different directory, there may be problems.  The gcc driver
has a builtin dependency on the specified installation directory and it
uses this to locate library and header files.  If you specify --with-as,
then it expects to find the assembly in the specified location.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc-64 on HP-UX 11.00

[H.Merijn Brand]

[-- Attachment #1: Type: text/plain, Size: 4095 bytes --]

On Fri 05 Apr 2002 18:06, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> Retry following my suggestions.  The important points are:
> 
> 1)  Use a common prefix for your tools (e.g., /usr/local/pa20_64).
      [v] Done
> 2)  Use --host=hppa64-hp-hpux11.00.
      [v] Done
> 3)  Export CC="cc -Ae +DA2.0W" for your initial builds of binutils and gcc.
      [v] Done
      [v] Rebuilt and installed binutils-2.12 again
      [v] gcc still problematic - build log attached (it requests to be sent
          to the gcc people :)

a5:/pro/3gl/GNU/gcc-3.0.4 129 > cat Conf-64
#!/usr/bin/sh

export CONFIG_SITE=
export CC="cc -Ae +DA2.0W"
export PATH=.:/usr/local/pa20_64/bin:/pro/local/bin
export PATH=$PATH"":/usr/bin:/opt/ansic/bin:/usr/ccs/bin:/opt/langtools/bin
export PATH=$PATH"":/opt/imake/bin

rm -rf obj
mkdir obj
cd obj
../src/configure \
    --enable-languages=gcc \
    --prefix=/usr/local/pa20_64 --with-local-prefix=/usr/local/pa20_64 \
    --with-gnu-as --with-as=/usr/local/pa20_64/bin/as \
    --with-gnu-ld --with-ld=/usr/local/pa20_64/bin/ld \
    --disable-shared \
    --disable-nls \
    --host=hppa64-hp-hpux11.00

echo ""
echo "Now start 'Build-64'"
a5:/pro/3gl/GNU/gcc-3.0.4 130 > cat Build-64
#!/usr/bin/sh

export CONFIG_SITE=
export CC="cc -Ae +DA2.0W"
export PATH=.:/usr/local/pa20_64/bin:/pro/local/bin
export PATH=$PATH"":/usr/bin:/opt/ansic/bin:/usr/ccs/bin:/opt/langtools/bin
export PATH=$PATH"":/opt/imake/bin

cd obj
make bootstrap-lean
a5:/pro/3gl/GNU/gcc-3.0.4 131 >


a5:/wrk/pa20_64/bin 135 > as --version
GNU assembler 2.12
Copyright 2002 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License.  This program has absolutely no warranty.
This assembler was configured for a target of `hppa64-hp-hpux11.00'.
a5:/wrk/pa20_64/bin 136 > ar --version
GNU ar 2.12
Copyright 2002 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License.  This program has absolutely no warranty.
a5:/wrk/pa20_64/bin 137 > file *
addr2line:      ELF-64 executable object file - PA-RISC 2.0 (LP64)
ar:             ELF-64 executable object file - PA-RISC 2.0 (LP64)
as:             ELF-64 executable object file - PA-RISC 2.0 (LP64)
c++:            ELF-64 executable object file - PA-RISC 2.0 (LP64)
c++filt:        ELF-64 executable object file - PA-RISC 2.0 (LP64)
cpp:            ELF-64 executable object file - PA-RISC 2.0 (LP64)
g++:            ELF-64 executable object file - PA-RISC 2.0 (LP64)
gas:            ELF-64 executable object file - PA-RISC 2.0 (LP64)
gasp:           ELF-64 executable object file - PA-RISC 2.0 (LP64)
gcc:            ELF-64 executable object file - PA-RISC 2.0 (LP64)
gcc64:          ELF-64 executable object file - PA-RISC 2.0 (LP64)
gccbug:         commands text
gcov:           ELF-64 executable object file - PA-RISC 2.0 (LP64)
gprof:          ELF-64 executable object file - PA-RISC 2.0 (LP64)
ld:             ELF-64 executable object file - PA-RISC 2.0 (LP64)
nm:             ELF-64 executable object file - PA-RISC 2.0 (LP64)
objcopy:        ELF-64 executable object file - PA-RISC 2.0 (LP64)
objdump:        ELF-64 executable object file - PA-RISC 2.0 (LP64)
ranlib:         ELF-64 executable object file - PA-RISC 2.0 (LP64)
readelf:        ELF-64 executable object file - PA-RISC 2.0 (LP64)
size:           ELF-64 executable object file - PA-RISC 2.0 (LP64)
strings:        ELF-64 executable object file - PA-RISC 2.0 (LP64)
strip:          ELF-64 executable object file - PA-RISC 2.0 (LP64)
a5:/wrk/pa20_64/bin 138 >

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.7.3 & 631 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
  WinNT 4, Win2K pro & WinCE 2.11.  Smoking perl CORE: smokers@perl.org
http://archives.develooper.com/daily-build@perl.org/   perl-qa@perl.org
send smoke reports to: smokers-reports@perl.org, QA: http://qa.perl.org

[-- Attachment #2: gcc-20020408-hpux64.tgz --]
[-- Type: application/octet-stream, Size: 18321 bytes --]

Re: gcc-64 on HP-UX 11.00

[John David Anglin]

>       [v] gcc still problematic - build log attached (it requests to be sen=
> t
>           to the gcc people :)
> 
> a5:/pro/3gl/GNU/gcc-3.0.4 129 > cat Conf-64

It's not totally clear which version your trying to build.  It looks like
3.0.4 but the files in the log file don't appear to be 3.0.4.  In any event,
there are a various warnings in the log file that are not normal:

cc -Ae +DA2.0W -c -DIN_GCC    -g    -DHAVE_CONFIG_H -DGENERATOR_FILE    -I. -I.
-I../../src/gcc -I../../src/gcc/. -I../../src/gcc/config -I../../src/gcc/../incl
ude ../../src/gcc/read-rtl.c -o read-rtl.o
cc: "../../src/gcc/read-rtl.c", line 671: warning 727: Cast truncates pointer in
to 32 bit integer.
cc -Ae +DA2.0W -c -DIN_GCC    -g    -DHAVE_CONFIG_H -DGENERATOR_FILE    -I. -I.
-I../../src/gcc -I../../src/gcc/. -I../../src/gcc/config -I../../src/gcc/../incl
ude ../../src/gcc/bitmap.c -o bitmap.o
cc: "../../src/gcc/bitmap.c", line 144: warning 727: Cast truncates pointer into
 32 bit integer.

[...]

c-parse.y:1951: warning: previous rule lacks an ending `;'
c-parse.y:2017: warning: previous rule lacks an ending `;'
c-parse.y:2048: warning: previous rule lacks an ending `;'

I have tested the suggested procedure with 3.1 (prerelease) from
todays cvs and it doesn't have a bootstrap failure in stage 1.
However, the procedure doesn't work with 3.0.4:

./gencodes ../../gcc/gcc/config/pa/pa.md > tmp-codes.h
/bin/sh: 1969 Memory fault(coredump)

This looks like a problem with alloca.  Suggest trying 3.1.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc-64 on HP-UX 11.00

[H.Merijn Brand]

Stripped the binutils from the Cc, cause I think we're on a gcc-only track now.

On Wed 10 Apr 2002 20:14, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> >       [v] gcc still problematic - build log attached (it requests to be sen=
> > t
> >           to the gcc people :)
> > 
> > a5:/pro/3gl/GNU/gcc-3.0.4 129 > cat Conf-64
> 
> It's not totally clear which version your trying to build.  It looks like
> 3.0.4 but the files in the log file don't appear to be 3.0.4.  In any event,
> there are a various warnings in the log file that are not normal:

The latest 'snapshot' as in gcc-20020408.tar.bz2
The prompt is indeed misleading, but I started this queeste on 3.0.4, so the
structure was already set up. But rest assured: no 3.0.4 code in here.

> cc -Ae +DA2.0W -c -DIN_GCC    -g    -DHAVE_CONFIG_H -DGENERATOR_FILE    -I. -I.
> -I../../src/gcc -I../../src/gcc/. -I../../src/gcc/config -I../../src/gcc/../incl
> ude ../../src/gcc/read-rtl.c -o read-rtl.o
> cc: "../../src/gcc/read-rtl.c", line 671: warning 727: Cast truncates pointer in
> to 32 bit integer.
> cc -Ae +DA2.0W -c -DIN_GCC    -g    -DHAVE_CONFIG_H -DGENERATOR_FILE    -I. -I.
> -I../../src/gcc -I../../src/gcc/. -I../../src/gcc/config -I../../src/gcc/../incl
> ude ../../src/gcc/bitmap.c -o bitmap.o
> cc: "../../src/gcc/bitmap.c", line 144: warning 727: Cast truncates pointer into
>  32 bit integer.
> 
> [...]
> 
> c-parse.y:1951: warning: previous rule lacks an ending `;'
> c-parse.y:2017: warning: previous rule lacks an ending `;'
> c-parse.y:2048: warning: previous rule lacks an ending `;'
> 
> I have tested the suggested procedure with 3.1 (prerelease) from
> todays cvs and it doesn't have a bootstrap failure in stage 1.
> However, the procedure doesn't work with 3.0.4:
> 
> ./gencodes ../../gcc/gcc/config/pa/pa.md > tmp-codes.h
> /bin/sh: 1969 Memory fault(coredump)
> 
> This looks like a problem with alloca.  Suggest trying 3.1.

What URL? (I've got no (working) cvs)

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.7.3 & 631 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
  WinNT 4, Win2K pro & WinCE 2.11.  Smoking perl CORE: smokers@perl.org
http://archives.develooper.com/daily-build@perl.org/   perl-qa@perl.org
send smoke reports to: smokers-reports@perl.org, QA: http://qa.perl.org

Re: gcc-64 on HP-UX 11.00

[John David Anglin]

> The latest 'snapshot' as in gcc-20020408.tar.bz2

I'll try the current cvs.

> > This looks like a problem with alloca.  Suggest trying 3.1.
> 
> What URL? (I've got no (working) cvs)

There don't seem to be any 3.1 snaps at ftp://gcc.gnu.org.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc-64 on HP-UX 11.00

[H.Merijn Brand]

On Wed 10 Apr 2002 21:44, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> > The latest 'snapshot' as in gcc-20020408.tar.bz2
> 
> I'll try the current cvs.
> 
> > > This looks like a problem with alloca.  Suggest trying 3.1.
> > 
> > What URL? (I've got no (working) cvs)
> 
> There don't seem to be any 3.1 snaps at ftp://gcc.gnu.org.

Can you make an (anonymous) ftp version available to me?
Do you think I'm /helping/, or just bothering?
Do you think it's worth the trouble?

If I manage - with your help - to build a working HP-UX gcc/64, I'll post the
Conf-64 and Build-64 scripts on the HP-UX forum, because I know there are more
people fighting with exactly the same problem, and none of those has reached
success

C-environment info:

a5:/u/usr/merijn 107 > ll /usr/lib/cpp /usr/ccs/lbin/cpp /opt/langtools/lbin/cpp /wrk/*64/bin/cpp
   1114 -r-xr-xr-x   1 bin      bin        548864 Sep 20  2001 /opt/langtools/lbin/cpp
    194 -r-xr-xr-x   1 bin      bin        258048 Nov  7  1997 /usr/ccs/lbin/cpp
   1170 lr-xr-xr-t   1 root     sys            23 Oct  9  2001 /usr/lib/cpp -> /opt/langtools/lbin/cpp
    355 -rwxr-xr-x   1 merijn   softwr     151384 Aug 27  2001 /wrk/gcc-3.0.1-64/bin/cpp
    556 -rwxr-xr-x   1 merijn   bin        666248 Oct 30 21:05 /wrk/pa20_64/bin/cpp
a5:/u/usr/merijn 108 > what !*
what /usr/lib/cpp /usr/ccs/lbin/cpp /opt/langtools/lbin/cpp /wrk/*64/bin/cpp
/usr/lib/cpp:
        HP92453-01 B.11.11.04 HP C Preprocessor
         $   Sep  8 2000 23:13:51 $
/usr/ccs/lbin/cpp:
        HP92453-01 A.11.00.00 HP C (Bundled) Preprocessor
         CUPROS_IC23B //1
         /ux/core/libs/libc/archive_pa1/libc.a_ID
         Oct 21 1997 13:07:38
/opt/langtools/lbin/cpp:
        HP92453-01 B.11.11.04 HP C Preprocessor
         $   Sep  8 2000 23:13:51 $
/wrk/gcc-3.0.1-64/bin/cpp:
/wrk/pa20_64/bin/cpp:
        HP92453-02A.11.00 HP-UX SYMBOLIC DEBUGGER (END.O LP64) $Revision: 75.03 $
a5:/u/usr/merijn 109 > path -w cc
/usr/bin/cc:
        LINT B.11.11.04 CXREF B.11.11.04
        HP92453-01 B.11.11.25985.GP HP C Compiler
         $   Sep  8 2000 23:13:51 $

        /usr/bin/cc:
     $Revision: 92453-07 linker linker crt0.o B.11.25 010530 $
a5:/u/usr/merijn 110 > swlist -l product | grep -e libc -e header -e ANSI
  C-ANSI-C              B.11.11.04     HP C/ANSI C Compiler
  PHCO_13349            1.0            XCurses header patch.
  PHCO_18228            1.0            libc man page cumulative patch
  PHCO_23706            1.0            cumulative 10.20 libc compatibility support
  PHCO_23770            1.0            libc cumulative patch
  PHCO_23963            1.0            libc cumulative header file patch
  PHCO_24723            1.0            libc cumulative patch
  PHCO_25707            1.0            libc cumulative patch
  PHSS_25985            1.0            ANSI C compiler General patch
a5:/u/usr/merijn 111 >

This should reflect the December-2001 QPK patch level. My other hp-11.00 is
already on March-2002, but users prevented me from updating this system so far.

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.7.3 & 631 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
  WinNT 4, Win2K pro & WinCE 2.11.  Smoking perl CORE: smokers@perl.org
http://archives.develooper.com/daily-build@perl.org/   perl-qa@perl.org
send smoke reports to: smokers-reports@perl.org, QA: http://qa.perl.org

Re: gcc-64 on HP-UX 11.00

[John David Anglin]

> On Wed 10 Apr 2002 21:44, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> > > The latest 'snapshot' as in gcc-20020408.tar.bz2
> > 
> > I'll try the current cvs.

I've duplicated the problem that you found.  It's a bug in the GNU linker.
It's not handling the relocations required for inline plabels correctly.
The function splay_tree_new_with_allocator seg-faults when it is passed
a pointer to the function splay_tree_xmalloc_allocate rather than a pointer
to a function descriptor for splay_tree_xmalloc_allocate.  The problem
is present in both 3.1 and the trunk.

This problem was introduced on 2002-02-22 when splay-tree.c was changed
to use the above indirect call.  The function splay-tree.c is in libiberty.
Libiberty gets built just in stage1 with the HP compiler.  The HP compiler
now uses inline plabels (LTP and RTP selectors).  The HP assembler and
linker can handle these relocation selectors, but unfortunately not the
GNU linker.

Gcc doesn't generate inline plabels on the PA.  It would save one insn
and one data location if we could use these selectors.  However, there
have been problems with them in 32bit land for years.  I think the
current assembler can handle them but the SOM linker still doesn't
handle them.

The work around is to use the HP linker for the initial bootstrap.  I
recommend just building C, install it, then do another full bootstrap
using gcc and the GNU linker.  You have to use the GNU assembler for
both builds.

Could you try another build?  Just remove "--with-gnu-ld" from your
script and specify "--with-ld=/usr/ccs/bin/ld".  You may want to
export LD_PXDB=/usr/bin/true to defer invocation of pxdb.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)

Re: gcc-64 on HP-UX 11.00

[H.Merijn Brand]

[-- Attachment #1: Type: text/plain, Size: 2468 bytes --]

On Thu 11 Apr 2002 17:18, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> > On Wed 10 Apr 2002 21:44, "John David Anglin" <dave@hiauly1.hia.nrc.ca> wrote:
> > > > The latest 'snapshot' as in gcc-20020408.tar.bz2
> > > 
> > > I'll try the current cvs.
> 
> I've duplicated the problem that you found.  It's a bug in the GNU linker.
> It's not handling the relocations required for inline plabels correctly.
> The function splay_tree_new_with_allocator seg-faults when it is passed
> a pointer to the function splay_tree_xmalloc_allocate rather than a pointer
> to a function descriptor for splay_tree_xmalloc_allocate.  The problem
> is present in both 3.1 and the trunk.
> 
> :
> 
> The work around is to use the HP linker for the initial bootstrap.  I
> recommend just building C, install it, then do another full bootstrap
> using gcc and the GNU linker.  You have to use the GNU assembler for
> both builds.
> 
> Could you try another build?  Just remove "--with-gnu-ld" from your
> script and specify "--with-ld=/usr/ccs/bin/ld".  You may want to
> export LD_PXDB=/usr/bin/true to defer invocation of pxdb.

echo "int xxy_us_dummy;" >tmp-dum.c
./xgcc -B./ -B/usr/local/pa20_64/hppa64-hp-hpux11.00/bin/ -isystem /usr/local/pa20_64/hppa64-hp-hpux11.00/include -isystem /usr/local/pa20_64/hppa64-hp-hpux11.00/sys-include -S tmp-dum.c
cc1: internal error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
make[2]: *** [s-under] Error 1
make[2]: Leaving directory `/pro/3gl/GNU/gcc-3.0.4/obj/gcc'
make[1]: *** [stage2_build] Error 2
make[1]: Leaving directory `/pro/3gl/GNU/gcc-3.0.4/obj/gcc'
make: *** [bootstrap-lean] Error 2

I've used Conf-64a and Build-64a and prepared Conf-gcc64 and Build-gcc64
Complete log of Build-64a included in the tgz

   105  17:28   Conf-64
   106  17:32   Build-64a |& tee gcc-20020408-hpux64
   107  17:54   tgz c gcc-20020408-hpux64.tgz Conf-64a Build-64a Conf-gcc64 Build-gcc64 gcc-20020408-hpux64

-- 
H.Merijn Brand        Amsterdam Perl Mongers (http://amsterdam.pm.org/)
using perl-5.6.1, 5.7.3 & 631 on HP-UX 10.20 & 11.00, AIX 4.2, AIX 4.3,
  WinNT 4, Win2K pro & WinCE 2.11.  Smoking perl CORE: smokers@perl.org
http://archives.develooper.com/daily-build@perl.org/   perl-qa@perl.org
send smoke reports to: smokers-reports@perl.org, QA: http://qa.perl.org

[-- Attachment #2: gcc-20020408-hpux64.tgz --]
[-- Type: application/octet-stream, Size: 17829 bytes --]

Re: gcc-64 on HP-UX 11.00

[law]

 In message <200204111518.g3BFIoZE029965@hiauly1.hia.nrc.ca>, "John David 
Anglin
" writes:
 > Gcc doesn't generate inline plabels on the PA.  It would save one insn
 > and one data location if we could use these selectors.  However, there
 > have been problems with them in 32bit land for years.  I think the
 > current assembler can handle them but the SOM linker still doesn't
 > handle them.
Actually the SOM linker can handle them, but there are corner cases with 
very large executables where it's impossible for the SOM linker to properly
fixup an inline plabel.  For that reason we stopped using them based on
a recommendation from HP.


jeff