[Bug c++/51037] New: SIGSEGV -O3 C++ only

[Bug c++/51037] New: SIGSEGV -O3 C++ only

[bin20111108.gcc.bugzilla at undecidable dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51037

             Bug #: 51037
           Summary: SIGSEGV -O3 C++ only
    Classification: Unclassified
           Product: gcc
           Version: 4.6.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: bin20111108.gcc.bugzilla@undecidable.com


Created attachment 25756
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25756
cutdown testcase

Using -O3 with g++-4.6.2 yields SIGSEGV for the attached test case.  gcc-4.6.2
successfully compiles this test case.  This appears to have something to do
with inlining.

% g++-4.6.2 -O3 -c cutdown.c
cutdown.c: In function 'char crash(const S*)':
cutdown.c:25:6: internal compiler error: Segmentation fault

% g++-4.6.2 -v -save-temps -O3 -c cutdown.c 
Using built-in specs.
COLLECT_GCC=/<path1 elided>/gcc/gcc-4.6.2/bin/g++-4.6.2
COLLECT_LTO_WRAPPER=/<path1
elided>/gcc/gcc-4.6.2/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.2/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-4.6.2/configure --prefix=/<path2
elided>/gcc-4.6/gcc_462_install2 --program-suffix=-4.6.2
Thread model: posix
gcc version 4.6.2 (GCC) 
COLLECT_GCC_OPTIONS='-B' '/<path1 elided>/binutils/binutils-2.21/linux' '-v'
'-save-temps' '-O3' '-c' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
 /<path1
elided>/gcc/gcc-4.6.2/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.2/cc1plus
-E -quiet -v -iprefix /<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/
-D_GNU_SOURCE cutdown.c -mtune=generic -march=x86-64 -O3 -fpch-preprocess -o
cutdown.ii
ignoring nonexistent directory "/<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../x86_64-unknown-linux-gnu/include"
ignoring duplicate directory "/<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../include/c++/4.6.2"
ignoring duplicate directory "/<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../include/c++/4.6.2/x86_64-unknown-linux-gnu"
ignoring duplicate directory "/<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../include/c++/4.6.2/backward"
ignoring duplicate directory "/<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/include"
ignoring nonexistent directory "/usr/local/include"
ignoring duplicate directory "/<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/include-fixed"
ignoring nonexistent directory "/<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/../../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../include/c++/4.6.2
 /<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../include/c++/4.6.2/x86_64-unknown-linux-gnu
 /<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../include/c++/4.6.2/backward
 /<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/include
 /<path1
elided>/gcc/gcc-4.6.2/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.6.2/include-fixed
 /<path1 elided>/gcc/gcc-4.6.2/bin/../lib/gcc/../../include
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-B' '/<path1 elided>/binutils/binutils-2.21/linux' '-v'
'-save-temps' '-O3' '-c' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
 /<path1
elided>/gcc/gcc-4.6.2/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.2/cc1plus
-fpreprocessed cutdown.ii -quiet -dumpbase cutdown.c -mtune=generic
-march=x86-64 -auxbase cutdown -O3 -version -o cutdown.s
GNU C++ (GCC) version 4.6.2 (x86_64-unknown-linux-gnu)
        compiled by GNU C version 4.6.2, GMP version 5.0.2, MPFR version 3.0.1,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++ (GCC) version 4.6.2 (x86_64-unknown-linux-gnu)
        compiled by GNU C version 4.6.2, GMP version 5.0.2, MPFR version 3.0.1,
MPC version 0.9
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 44ccbc803fa60baa0f85c76972fa817b
cutdown.c: In function 'char crash(const S*)':
cutdown.c:25:6: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

[Bug c++/51037] SIGSEGV -O3 C++ only

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51037

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |x86_64-unknown-linux-gnu
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2011-11-09
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-11-09 09:51:53 UTC ---
I can't reproduce this.  Can you attach cutdown.ii please?

[Bug c++/51037] SIGSEGV -O3 C++ only

[bin20111108.gcc.bugzilla at undecidable dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51037

bin20111108.gcc.bugzilla at undecidable dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #25756|0                           |1
        is obsolete|                            |

--- Comment #2 from bin20111108.gcc.bugzilla at undecidable dot com 2011-11-10 18:14:53 UTC ---
Created attachment 25791
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25791
testcase with no include files

I'm sorry, I should have cut out stdint.h before submitting the bug.  I have
reworked the test case to eliminate all include files.

[Bug c++/51037] SIGSEGV -O3 C++ only

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51037

Paolo Carlini <paolo.carlini at oracle dot com> changed:

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

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-12-19 23:16:20 UTC ---
Works for me too.

[Bug c++/51037] SIGSEGV -O3 C++ only

[marc.glisse at normalesup dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51037

Marc Glisse <marc.glisse at normalesup dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marc.glisse at normalesup
                   |                            |dot org

--- Comment #4 from Marc Glisse <marc.glisse at normalesup dot org> 2011-12-20 17:07:54 UTC ---
It still happens on Debian, which has a version based on r182430 (Dec 17), but
not when I build today's (Dec 20) branch myself.