[Bug pch/14940] New: PCH largefile test fails on various platforms

[Bug pch/14940] New: PCH largefile test fails on various platforms

[ian at wasabisystems dot com]

The PCH largefile test, in gcc/testsuite/gcc.dg/pch/pch.exp, fails using the
default mmap implementation on i386-unknown-netbsdelf1.6.1.

It also fails using the Solaris implementation on sparc-sun-solaris2.9.  It
fails on i686-pc-cygwin, although actually most of the PCH tests fail on that
platform.

A failure in the PCH largefile test for a given platform means that PCH is
unstable for that platform.  A PCH will work for most source code files but will
fail for large source code files.  The user can not easily predict when a PCH
will work and when it will fail.  When a PCH fails, there is no easy way to
compile the file without removing the PCH so that gcc does not find it.

On i386-unknown-netbsdelf1.6.1, and probably other platforms, a direct
consequence is that qt-x11-free-3.3.0 can not be built.  Those sources test
whether PCH works, and use it if they do.  The test passes, but some of the
source files are large.  Those source files fail to build.

-- 
           Summary: PCH largefile test fails on various platforms
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: pch
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ian at wasabisystems dot com
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i386-unknown-netbsdelf1.6.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[ebotcazou at gcc dot gnu dot org]

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           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-04-13 16:09 -------
Confirmed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   GCC host triplet|i386-unknown-netbsdelf1.6.1 |
 GCC target triplet|                            |i386-unknown-netbsdelf1.6.1
           Keywords|                            |ice-on-valid-code
   Last reconfirmed|0000-00-00 00:00:00         |2004-04-13 16:09:15
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[geoffk at gcc dot gnu dot org]

------- Additional Comments From geoffk at gcc dot gnu dot org  2004-04-13 18:56 -------
The Cygwin problems are 11341.

I've added the two BSD maintainers to the CC.

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           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |thorpej at wasabisystems dot
                   |                            |com, ljrittle at acm dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[ljrittle at gcc dot gnu dot org]

------- Additional Comments From ljrittle at gcc dot gnu dot org  2004-04-14 17:52 -------
Confirmed on i386-unknown-freebsd4.9 with yesterday's tree-ssa build.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-07-17 04:09 -------
*** Bug 16599 has been marked as a duplicate of this bug. ***

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |danglin at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-07-17 04:10 -------
Actually this is target independent and only host dependent.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   GCC host triplet|                            |i386-unknown-netbsdelf1.6.1,
                   |                            |hppa*-hp-hpux*, hppa*-
                   |                            |unknown-linux
 GCC target triplet|i386-unknown-netbsdelf1.6.1 |
                   |hppa*-hp-hpux*, hppa*-      |
                   |unknown-linux-              |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[dave at hiauly1 dot hia dot nrc dot ca]

------- Additional Comments From dave at hiauly1 dot hia dot nrc dot ca  2004-07-17 04:21 -------
Subject: Re:  PCH largefile test fails on various platforms

> Actually this is target independent and only host dependent.

Do you think we could set or fallback to MAP_FIXED?  If we can't, the
mmap call can fail on all hosts and the problem is not host dependent.

Dave


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[ian at wasabisystems dot com]

------- Additional Comments From ian at wasabisystems dot com  2004-07-17 14:20 -------
Subject: Re:  PCH largefile test fails on various platforms

Some hosts override the default mmap call.  See, e.g.,
config/host-linux.c.  So whether this works is indeed host dependent.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[ian at wasabisystems dot com]

------- Additional Comments From ian at wasabisystems dot com  2004-07-17 14:43 -------
I should add that always using MAP_FIXED will cause the new mmap to clobber any
existing memory maps, which will lead to silent failure if the GC code (or the
library malloc code) happens to have mapped any portion of that memory space. 
So using MAP_FIXED does not work in general.  For an example of how it can be
used on some systems, see gcc/config/host-solaris.c, which uses mincore() to
explicitly check whether anything else is mapped in that address space.  But
note that that code does not work on, e.g., GNU/Linux, because mincore() does
not work as expected--it does not detect anonymous maps.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[ebotcazou at gcc dot gnu dot org]

------- Additional Comments From ebotcazou at gcc dot gnu dot org  2004-07-17 15:43 -------
Note also that, although the mincore() trick is functional on Solaris, it
doesn't solve the problem in general because the largefile test fails on all
versions I tested (Solaris 2.5.1, 2.6, 7, 8 and 9).


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[dave at hiauly1 dot hia dot nrc dot ca]

------- Additional Comments From dave at hiauly1 dot hia dot nrc dot ca  2004-07-17 17:10 -------
Subject: Re:  PCH largefile test fails on various platforms

> ------- Additional Comments From ebotcazou at gcc dot gnu dot org
> 2004-07-17 15:43 -------
> Note also that, although the mincore() trick is functional on Solaris, it
> doesn't solve the problem in general because the largefile test fails on all
> versions I tested (Solaris 2.5.1, 2.6, 7, 8 and 9).

Is that because a page is mapped in the PCH memory region, or because
the mmap call with MAP_FIXED fails to return the desired address?

HP-UX doesn't have mincore.  It might be possible to write a routine
to probe the region.  However, it's not going to fix the problem if
extant pages can be mapped in the PCH memory region.

Dave


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[ebotcazou at gcc dot gnu dot org]

------- Additional Comments From ebotcazou at gcc dot gnu dot org  2004-07-18 10:00 -------
> Is that because a page is mapped in the PCH memory region, or because
> the mmap call with MAP_FIXED fails to return the desired address?

The former IIRC.

> HP-UX doesn't have mincore.  It might be possible to write a routine
> to probe the region.  However, it's not going to fix the problem if
> extant pages can be mapped in the PCH memory region.

Btw, the test fails on PA/Linux too?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[ian at wasabisystems dot com]

------- Additional Comments From ian at wasabisystems dot com  2004-07-18 12:25 -------
Subject: Re:  PCH largefile test fails on various platforms

"ebotcazou at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> writes:

> Btw, the test fails on PA/Linux too?

Add an appropriate definition of TRY_EMPTY_VM_SPACE in
gcc/config/host-linux.c.

Ian


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[dave at hiauly1 dot hia dot nrc dot ca]

------- Additional Comments From dave at hiauly1 dot hia dot nrc dot ca  2004-07-18 16:03 -------
Subject: Re:  PCH largefile test fails on various platforms

> Btw, the test fails on PA/Linux too?

Yes.  I had one libstdc++ testsuite run recently where this problem
caused nearly all the tests to fail.  It's not just a problem with
largefile.c.

Dave


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-07-20 17:49 -------
The freebsd problem is PR 16646.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-08-21 17:05 -------
*** Bug 17131 has been marked as a duplicate of this bug. ***

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |cato at df dot lth dot se


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[dave at hiauly1 dot hia dot nrc dot ca]

------- Additional Comments From dave at hiauly1 dot hia dot nrc dot ca  2004-08-31 14:20 -------
Subject: Re:  PCH largefile test fails on various platforms

I have noted in testing in the past week that changing kernels on
hppa-linux can break PCH.  Rerunning the libstdc++-v3 testsuite
after a kernel change sometimes causes nearly all the tests to
fail.

Dave


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[jgrimm2 at us dot ibm dot com]

------- Additional Comments From jgrimm2 at us dot ibm dot com  2004-10-12 19:56 -------
patch for powerpc64-linux-gnu:
http://gcc.gnu.org/ml/gcc-patches/2004-10/msg01037.html


Index: gcc/config/host-linux.c
===================================================================
RCS file: /home/jgrimm/gcc-cvs/gcc/gcc/config/host-linux.c,v
retrieving revision 1.2
diff -c -3 -p -r1.2 host-linux.c
*** gcc/config/host-linux.c	24 Apr 2004 00:33:18 -0000	1.2
--- gcc/config/host-linux.c	12 Oct 2004 21:35:47 -0000
***************
*** 75,80 ****
--- 75,82 ----
  # define TRY_EMPTY_VM_SPACE	0x8000000000
  #elif defined(__s390__)
  # define TRY_EMPTY_VM_SPACE	0x60000000
+ #elif defined(__powerpc__)
+ # define TRY_EMPTY_VM_SPACE	0x60000000
  #else
  # define TRY_EMPTY_VM_SPACE	0
  #endif



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[phython at gcc dot gnu dot org]

------- Additional Comments From phython at gcc dot gnu dot org  2004-11-04 04:57 -------
+ #elif defined(__sparc__)
+ # define TRY_EMPTY_VM_SPACE	0x60000000

 Also works for sparc-linux and largefile.c on sparc64-linux.  Unfortunatly,
there are other pch failures on sparc64-linux.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[ebotcazou at gcc dot gnu dot org]

------- Additional Comments From ebotcazou at gcc dot gnu dot org  2004-11-04 07:09 -------
> + #elif defined(__sparc__)
> + # define TRY_EMPTY_VM_SPACE	0x60000000
> 
>  Also works for sparc-linux and largefile.c on sparc64-linux.  Unfortunatly,
> there are other pch failures on sparc64-linux.

I'm a bit skeptical about using the same value for the 32-bit and the 64-bit
flavors, but I'm not a specialist of Linux on the SPARC at all.  I'd suggest to
contact David S. Miller (see the MAINTAINERS file).


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |phython at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-11-09 12:35 -------
Subject: Bug 14940

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	phython@gcc.gnu.org	2004-11-09 12:35:16

Modified files:
	gcc            : ChangeLog 
	gcc/config     : host-linux.c 

Log message:
	2004-11-07  James A. Morrison  <phython@gcc.gnu.org>
	
	PR pch/14940
	* config/host-linux.c (TRY_EMPTY_VM_SPACE): Add __sparc__
	definitions.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.6237&r2=2.6238
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/host-linux.c.diff?cvsroot=gcc&r1=1.3&r2=1.4



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-11-23 02:30 -------
Subject: Bug 14940

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	danglin@gcc.gnu.org	2004-11-23 02:29:40

Modified files:
	gcc            : ChangeLog 
	gcc/config     : host-linux.c 

Log message:
	PR pch/14940
	* config/host-linux.c (TRY_EMPTY_VM_SPACE): Define for __hppa__.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.6476&r2=2.6477
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/host-linux.c.diff?cvsroot=gcc&r1=1.4&r2=1.5



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-11-27 16:57 -------
Subject: Bug 14940

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	danglin@gcc.gnu.org	2004-11-27 16:57:06

Modified files:
	gcc            : ChangeLog 
	gcc/config     : host-linux.c 

Log message:
	PR pch/14940
	* config/host-linux.c (TRY_EMPTY_VM_SPACE): Revert 2004-11-22 change.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.6586&r2=2.6587
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/host-linux.c.diff?cvsroot=gcc&r1=1.5&r2=1.6



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940

[Bug pch/14940] PCH largefile test fails on various platforms

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-11-30 03:11 -------
Subject: Bug 14940

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	danglin@gcc.gnu.org	2004-11-30 03:11:29

Modified files:
	gcc            : ChangeLog config.host 
Added files:
	gcc/config/pa  : pa-host.c x-hpux x-linux 

Log message:
	PR pch/14940
	* config/pa/pa-host.c, config/pa/x-hpux, config/pa/x-linux: New files.
	* config.host (hppa*-*-hpux*, hppa*-*-linux): Define out_host_hook_obj
	and host_xmake_file using new host configuration files.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.6636&r2=2.6637
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config.host.diff?cvsroot=gcc&r1=2.11&r2=2.12
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/pa/pa-host.c.diff?cvsroot=gcc&r1=NONE&r2=1.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/pa/x-hpux.diff?cvsroot=gcc&r1=NONE&r2=1.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/pa/x-linux.diff?cvsroot=gcc&r1=NONE&r2=1.1



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940