[Bug bootstrap/48400] New: [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[Bug bootstrap/48400] New: [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

           Summary: [4.7 Regression] powerpc-apple-darwin9 fails to
                    bootstrap at revision 171824
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dominiq@lps.ens.fr
                CC: rth@gcc.gnu.org, rdsandiford@googlemail.com,
                    froydnj@codesourcery.com
              Host: powerpc-apple-darwin9
            Target: powerpc-apple-darwin9
             Build: powerpc-apple-darwin9


powerpc-apple-darwin9 fails to bootstrap at revision 171824 (see
http://gcc.gnu.org/ml/gcc-regression/2011-04/msg00015.html ). The failure is

/Users/regress/tbox/native/build/./gcc/xgcc
-B/Users/regress/tbox/native/build/./gcc/
-B/Users/regress/tbox/objs/powerpc-apple-darwin9.8.0/bin/
-B/Users/regress/tbox/objs/powerpc-apple-darwin9.8.0/lib/ -isystem
/Users/regress/tbox/objs/powerpc-apple-darwin9.8.0/include -isystem
/Users/regress/tbox/objs/powerpc-apple-darwin9.8.0/sys-include    -O2  -g -O2
-DIN_GCC   -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes
-Wmissing-prototypes -Wold-style-definition  -isystem ./include 
-Wa,-force_cpusubtype_ALL -pipe -mmacosx-version-min=10.4 -g
-DHAVE_GTHR_DEFAULT -DIN_LIBGCC2 -D__GCC_FLOAT_NOT_NEEDED -fno-stack-protector 
-dynamiclib -nodefaultlibs -install_name
/Users/regress/tbox/objs/lib/libgcc_s.1.dylib -single_module -o
ppc64/libgcc_s.dylib -Wl,-exported_symbols_list,libgcc.map
-compatibility_version 1 -current_version 1.0 -g -O2 -m64 -B./ _muldi3_s.o
_negdi2_s.o _lshrdi3_s.o _ashldi3_s.o _ashrdi3_s.o _cmpdi2_s.o _ucmpdi2_s.o
_clear_cache_s.o _enable_execute_stack_s.o _
 trampoline_s.o __main_s.o _absvsi2_s.o _absvdi2_s.o _addvsi3_s.o _addvdi3_s.o
_subvsi3_s.o _subvdi3_s.o _mulvsi3_s.o _mulvdi3_s.o _negvsi2_s.o _negvdi2_s.o
_ctors_s.o _ffssi2_s.o _ffsdi2_s.o _clz_s.o _clzsi2_s.o _clzdi2_s.o _ctzsi2_s.o
_ctzdi2_s.o _popcount_tab_s.o _popcountsi2_s.o _popcountdi2_s.o _paritysi2_s.o
_paritydi2_s.o _powisf2_s.o _powidf2_s.o _powixf2_s.o _powitf2_s.o _mulsc3_s.o
_muldc3_s.o _mulxc3_s.o _multc3_s.o _divsc3_s.o _divdc3_s.o _divxc3_s.o
_divtc3_s.o _bswapsi2_s.o _bswapdi2_s.o _fixunssfsi_s.o _fixunsdfsi_s.o
_fixunsxfsi_s.o _fixsfdi_s.o _fixdfdi_s.o _fixxfdi_s.o _fixtfdi_s.o
_fixunssfdi_s.o _fixunsdfdi_s.o _fixunsxfdi_s.o _fixunstfdi_s.o _floatdisf_s.o
_floatdidf_s.o _floatdixf_s.o _floatditf_s.o _floatundisf_s.o _floatundidf_s.o
_floatundixf_s.o _floatunditf_s.o _divdi3_s.o _moddi3_s.o _udivdi3_s.o
_umoddi3_s.o _udiv_w_sdiv_s.o _udivmoddi4_s.o darwin-tramp_s.o ppc64-fp_s.o
darwin-64_s.o darwin-ldouble_s.o darwin-world_s.o unwind-dw2_s.o unwind-dw2-fd
 e-darwin_s.o unwind-sjlj_s.o unwind-c_s.o darwin-fallback_s.o emutls_s.o -lc
collect2: ld terminated with signal 10 [Bus error]

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

Richard Henderson <rth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2011.04.01 16:08:12
         AssignedTo|unassigned at gcc dot       |rth at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-01 16:08:12 UTC ---
Probably my changes to dwarf2out.  Jakub pointed out that I'm not
protecting the discriminator output in strict mode.  Although we
don't really know that's the actual problem yet...

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-04-01 16:26:30 UTC ---
> Probably my changes to dwarf2out. ...

Yes, the failure appears at revision 171816.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-04-01 16:54:38 UTC ---
/opt/gcc/darwin_buildw/./gcc/xgcc -B/opt/gcc/darwin_buildw/gcc/ -nodefaultlibs
-m64 _clz_s.o
is enough to trigger the bus error.

The crash report is

Process:         ld [26752]
Path:            /usr/libexec/gcc/powerpc-apple-darwin9/4.2.1/ld
Identifier:      ld
Version:         ??? (???)
Code Type:       PPC (Native)
Parent Process:  collect2 [26751]

Date/Time:       2011-04-01 18:53:37.854 +0200
OS Version:      Mac OS X 10.5.8 (9L30)
Report Version:  6
Anonymous UUID:  FBE1ED73-9408-41D7-896B-6AB519EED984

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000044
Crashed Thread:  0

Thread 0 Crashed:
0   ld                                0x000ff980 0x1000 + 1042816

Thread 0 crashed with PPC Thread State 32:
  srr0: 0x000ff980  srr1: 0x0200d030   dar: 0x00000044 dsisr: 0x40000000
    r0: 0x00000000    r1: 0xbfffc950    r2: 0x00000001    r3: 0x00000000
    r4: 0xbfffcb40    r5: 0x00000004    r6: 0x000000e9    r7: 0xbfffcb70
    r8: 0xbfffcb68    r9: 0x00000004   r10: 0x00000007   r11: 0x42000024
   r12: 0x97852d10   r13: 0x00200d48   r14: 0x00200da4   r15: 0x00200db8
   r16: 0x00200d78   r17: 0x00200d64   r18: 0x00200d1c   r19: 0x00200d0c
   r20: 0x00200d30   r21: 0xbfffcb40   r22: 0x00200d60   r23: 0x00200d18
   r24: 0x00200df0   r25: 0x00000000   r26: 0x00000000   r27: 0x00000000
   r28: 0x00000000   r29: 0x00000000   r30: 0x00000004   r31: 0x00000000
    cr: 0x22008024   xer: 0x20000000    lr: 0x000b371c   ctr: 0x97852d10
vrsave: 0x00000000

Binary Images:
    0x1000 -   0x12effb  ld ??? (???) <82e5f43ac9b963abbf9f1e833205e2f9>
/usr/libexec/gcc/powerpc-apple-darwin9/4.2.1/ld
0x8fe00000 - 0x8fe30c23  dyld 97.1 (???) <89a0055b0e7ea2db881b73c6e63bc774>
/usr/lib/dyld
0x9338d000 - 0x93392ff6  libmathCommon.A.dylib ??? (???)
/usr/lib/system/libmathCommon.A.dylib
0x965fd000 - 0x96608ffb  libgcc_s.1.dylib ??? (???)
<ea47fd375407f162c76d14d64ba246cd> /usr/lib/libgcc_s.1.dylib
0x9784c000 - 0x979ecfe3  libSystem.B.dylib ??? (???)
<64fe5af6f50c88c6a75513b6cdc121da> /usr/lib/libSystem.B.dylib
0x97a50000 - 0x97ab7ffb  libstdc++.6.dylib ??? (???)
<a4e9b10268b3ffac26d0296499b24e8e> /usr/lib/libstdc++.6.dylib
0xffff8000 - 0xffff9703  libSystem.B.dylib ??? (???) /usr/lib/libSystem.B.dylib

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|powerpc-apple-darwin9       |*-apple-darwin9
                 CC|                            |iains at gcc dot gnu.org
               Host|powerpc-apple-darwin9       |*-apple-darwin9
              Build|powerpc-apple-darwin9       |*-apple-darwin9

--- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> 2011-04-01 17:22:20 UTC ---
also on i686-darwin9

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #5 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-01 18:15:50 UTC ---
Created attachment 23847
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23847
proposed patch

Re #c2: It's good to know that Apple is just as forgiving with
extensions to an extensible standard as ever.

The relevent portion of this patch is the first two added lines,
but I was in the middle of adding commentary for the change that
Dodji wanted originally.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #6 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-01 20:23:04 UTC ---
Author: rth
Date: Fri Apr  1 20:23:00 2011
New Revision: 171852

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=171852
Log:
PR 48400
* dwarf2out.c (dwarf2out_source_line): Disable discriminators
in strict mode before dwarf4.  Re-order tests to early out
before switching sections.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2out.c

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

Richard Henderson <rth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #7 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-01 20:24:55 UTC ---
Hopefully the patch committed fixed it.  Please re-open if not.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |

--- Comment #8 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-04-01 21:59:30 UTC ---
> Hopefully the patch committed fixed it.  Please re-open if not.

Unfortunately it doesn't (see
http://gcc.gnu.org/ml/gcc-regression/2011-04/msg00065.html).

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

Richard Henderson <rth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |WAITING

--- Comment #9 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-01 22:07:54 UTC ---
Can you please try this then?  That'll at least rule out the one
extra piece of information that we're emitting.  This datum *is*
in plain old dwarf2, but... who knows.


diff --git a/gcc/dwarf2out.c b/gcc/dwarf2out.c
index b299bc7..fef244d 100644
--- a/gcc/dwarf2out.c
+++ b/gcc/dwarf2out.c
@@ -22136,6 +22136,7 @@ dwarf2out_source_line (unsigned int line, const char
*fi
      by simply removing it if we're not supposed to output it.  */
   if (dwarf_version < 4 && dwarf_strict)
     discriminator = 0;
+  /* ??? Apple hack */ is_stmt = DWARF_LINE_DEFAULT_IS_STMT_START;

   table = cur_line_info_table;
   file_num = maybe_emit_file (lookup_filename (filename));

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #10 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-04-01 22:45:52 UTC ---
> Can you please try this then? ...

Sorry, but gcc still fails to bootstrap with the same error.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #11 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-02 00:45:46 UTC ---
Well, then someone will have to debug this somehow; it really looks
like we're producing the same output before and after...

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #12 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-04-02 15:01:18 UTC ---
> Well, then someone will have to debug this somehow; it really looks
> like we're producing the same output before and after...

I have bootstrapped revision 171815 and
powerpc-apple-darwin9/ppc64/libgcc/_clz_s.o at stage 1 for evision 171816
differs from the same file in stage1-powerpc-apple-darwin9/ppc64/libgcc/.
collect2 gives a bus error with the former, but not with the later. The only
differences for the outputs of dwarfdump are

[karma] gcc/rel_build% diff dw_15 dw_16
2c2
<  File: ../rel_build-171815/stage1-powerpc-apple-darwin9/ppc64/libgcc/_clz_s.o
(ppc64)
---
>  File: powerpc-apple-darwin9/ppc64/libgcc/_clz_s.o (ppc64)
9c9
<              AT_producer( "GNU C 4.7.0 20110401 (experimental) [trunk
revision 171815]" )
---
>              AT_producer( "GNU C 4.7.0 20110401 (experimental) [trunk revision 171816]" )

Will it help if I attach the object files?

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #13 from Iain Sandoe <iains at gcc dot gnu.org> 2011-04-02 15:04:05 UTC ---
Created attachment 23853
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23853
OK @ 171815

bootstrapped - and then deleted _clz*, - then CFLAGS_FOR_TARGET="-O2 -g
-save-temps -fverbose-asm -dA"

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #14 from Iain Sandoe <iains at gcc dot gnu.org> 2011-04-02 15:07:22 UTC ---
Created attachment 23854
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23854
171816 + patch - not working

removed i686-apple-darwin9/* ... bootstrap fails...

deleted _clz* -- then bootstrapped with CFLAGS_FOR_TARGET="-O2 -g -save-temps
-fverbose-asm -dA"

.. there is a difference, although I can't say whether the fault lies with ld64
or gcc ...

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #15 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-04-02 16:00:46 UTC ---
AFAICT the problematic objects are only _clz_s.o and _popcount_tab_s.o.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #16 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-02 19:25:50 UTC ---
Created attachment 23855
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23855
second proposed patch

The fault is 100% with ld.  GCC is producing valid dwarf2.

The *only* changes in your diff are (1) the description of the standard
opcodes, and (2) an empty line number region that has been removed.

For (1), you'll note that it *is* an extensible table.  One can add new
opcodes to the table and remain true to the dwarf2 standard.  The
consumer is free to ignore any opcodes that it doesn't understand.

I hate Apple's linker.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #17 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-04-02 22:59:09 UTC ---
> Created attachment 23855 [details]
> second proposed patch

Unfortunately it does not work either.

> The fault is 100% with ld.  GCC is producing valid dwarf2.

There is no point to complain about the ld in darwin9: it won't be fixed and
the error is not present in darwin10 (even if it fails to bootstrap for other
reasons, see pr48403).

> The *only* changes in your diff are (1) the description of the standard
> opcodes, and (2) an empty line number region that has been removed.

I see three differences:


*** 819,826 ****
      .byte    0x1    # Minimum Instruction Length
      .byte    0x1    # Default is_stmt_start flag
      .byte    0xf6    # Line Base Value (Special Opcodes)
!     .byte    0xf5    # Line Range Value (Special Opcodes)
!     .byte    0xa    # Special Opcode Base
      .byte    0    # opcode: 0x1 has 0 args
      .byte    0x1    # opcode: 0x2 has 1 args
      .byte    0x1    # opcode: 0x3 has 1 args
--- 819,826 ----
      .byte    0x1    # Minimum Instruction Length
      .byte    0x1    # Default is_stmt_start flag
      .byte    0xf6    # Line Base Value (Special Opcodes)
!     .byte    0xf2    # Line Range Value (Special Opcodes)
!     .byte    0xd    # Special Opcode Base
      .byte    0    # opcode: 0x1 has 0 args
      .byte    0x1    # opcode: 0x2 has 1 args
      .byte    0x1    # opcode: 0x3 has 1 args
***************

*** 830,835 ****
--- 830,838 ----
      .byte    0    # opcode: 0x7 has 0 args
      .byte    0    # opcode: 0x8 has 0 args
      .byte    0x1    # opcode: 0x9 has 1 args
+     .byte    0    # opcode: 0xa has 0 args
+     .byte    0    # opcode: 0xb has 0 args
+     .byte    0x1    # opcode: 0xc has 1 args
      .ascii "../../../../gcc-4-7-reghunt/libgcc/../gcc\0"    # Directory
Entry: 0x1
      .ascii "../../../../gcc-4-7-reghunt/libgcc/../gcc/config/i386\0"    #
Directory Entry: 0x2
      .byte    0    # End directory table
***************

*** 847,858 ****
      .byte    0    # uleb128 0
      .byte    0    # End file name table
  LELTP0:
-     .byte    0    # DW_LNE_set_address
-     .byte    0x9    # uleb128 0x9
-     .byte    0x2
-     .quad    Letext0
-     .byte    0    # DW_LNE_end_sequence
-     .byte    0x1    # uleb128 0x1
-     .byte    0x1
  LELT0:
      .subsections_via_symbols
--- 850,854 ----

Are the values

!     .byte    0xf2    # Line Range Value (Special Opcodes)
!     .byte    0xd    # Special Opcode Base

OK?

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #18 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-03 02:57:45 UTC ---
Both the first and second hunks are part of the same change.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #19 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-03 03:06:35 UTC ---
What are the changes *after* the second patch?  The first two hunks
ought to have disappeared.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |peter at pogma dot com

--- Comment #20 from Iain Sandoe <iains at gcc dot gnu.org> 2011-04-03 10:03:44 UTC ---
(In reply to comment #16)
> Created attachment 23855 [details]
> second proposed patch
> 
> The fault is 100% with ld.  GCC is producing valid dwarf2.

:-(

> I hate Apple's linker.

That's understandable, since you don't see the up-side (only the problems).

AFAIK, they intend that it will support the output of GCC - but that will only
apply to the leading edge - and, as Dominique said, leaves Darwin9 (and maybe
even 10, given the timescales) high and dry.

As I see it we have these options (other than the trivial 'give up'):

1. live with the native tool-chain and provide hooks/work-arounds  to let us
fix things up...

2. odcctools -- unfortunately, trunk (159) of odcctools also has this problem,
I just tried to bootstrap ppc with it.  There are up-to-date releases of the
Apple tools - but it depends on someone having time to integrate them.  Also,
more of a tricky business for the end User.

3. finish porting mach-o to binutils (I've made some progress with BFD and GAS
- but not even started to look at LD) ... waiting for the paperwork to come
through to extend my assignments to binutils....

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P4
   Target Milestone|---                         |4.7.0

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #21 from Iain Sandoe <iains at gcc dot gnu.org> 2011-04-03 11:43:30 UTC ---
(In reply to comment #19)

on  i686-darwin9
the bootstrap still fails with the bus err.

> What are the changes *after* the second patch?  The first two hunks
> ought to have disappeared.

they have, the remaining difference is:

@@ -847,12 +847,5 @@ LASLTP0:
        .byte   0       # uleb128 0
        .byte   0       # End file name table
 LELTP0:
-       .byte   0       # DW_LNE_set_address
-       .byte   0x9     # uleb128 0x9
-       .byte   0x2
-       .quad   Letext0
-       .byte   0       # DW_LNE_end_sequence
-       .byte   0x1     # uleb128 0x1
-       .byte   0x1
 LELT0:
        .subsections_via_symbols

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

Richard Henderson <rth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #23855|0                           |1
        is obsolete|                            |

--- Comment #22 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-03 18:08:06 UTC ---
Created attachment 23860
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23860
third proposed patch

One more possibility.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #23 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-03 18:16:04 UTC ---
... and if that works, we'll see how much of the other line info
additions we can put back in.  Assuming you've a modern debugger
that might be able to use them ...

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[iains at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #24 from Iain Sandoe <iains at gcc dot gnu.org> 2011-04-03 19:18:31 UTC ---
(In reply to comment #23)
> ... and if that works, we'll see how much of the other line info
> additions we can put back in.  Assuming you've a modern debugger
> that might be able to use them ...

:( ... not on i686-darwin9.

I assume that patch 3 applies on top of patch 1 - and that it applies to
r171816...

the remaining difference is setting 

    .byte    0    # DW_LNE_set_address
    .byte    0x9    # uleb128 0x9
    .byte    0x2
    .quad    Letext0

which, I take it you believe to be superfluous?
(unfortunately, I don't read DWARF bytecode natively ;) ) ....

I wonder if something is un-initialized in ld64 :(

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #25 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-04-03 19:27:08 UTC ---
> I wonder if something is un-initialized in ld64 :(

AFAICT the problem occurs for both -m64 and -m32.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

Richard Henderson <rth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #23860|0                           |1
        is obsolete|                            |

--- Comment #26 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-03 21:03:51 UTC ---
Created attachment 23865
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23865
fourth patch

Relative to head, or whatever you patched last time.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #27 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-04-03 21:52:57 UTC ---
With the patch in comment #26 on top of revision 171916, I am now at stage 2,
i.e., past the previous failures. Thanks for the perseverance;-)

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #28 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-04-04 06:32:26 UTC ---
With the patch in comment #26 on top of revision 171916, bootstrap proceeded up
to pr48403.

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

--- Comment #29 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-04 22:13:58 UTC ---
Author: rth
Date: Mon Apr  4 22:13:54 2011
New Revision: 171955

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=171955
Log:
PR 48400
* dwarf2out.c (output_line_info): Always emit line info from
at least one section.
(dwarf2out_init): Create text_section_line_info here ...
(set_cur_line_info_table): ... not here.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/dwarf2out.c

[Bug bootstrap/48400] [4.7 Regression] powerpc-apple-darwin9 fails to bootstrap at revision 171824

[rth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48400

Richard Henderson <rth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |FIXED

--- Comment #30 from Richard Henderson <rth at gcc dot gnu.org> 2011-04-04 22:17:05 UTC ---
I committed a variant of the third and fourth patches, with
extra commentary, now that we know exactly what the problem is.