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

["bin20111108.gcc.bugzilla at undecidable dot com" <gcc-bugzilla at gcc dot gnu dot org>]

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.