[Bug c++/55131] New: Segmentation fault happened after upgraded g++ from 3.4.6 to 4.7.0

["mawenqi108 at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55131

             Bug #: 55131
           Summary: Segmentation fault happened after upgraded g++ from
                    3.4.6 to 4.7.0
    Classification: Unclassified
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mawenqi108@gmail.com


Created attachment 28570
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28570
The source file

Recently I have upgraded the build environment from RHEL 4.7 (32bit) with g++
3.4.6 to CentOS 6.3 (32bit) with g++ 4.7.0. While an inline assembly function,
which implements the atomic comparison and exchange function, could not work
anymore.The attachment is the source file for your reference.

On the old RHEL 4.7 environment:
# g++ -v
Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.6/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux
Thread model: posix
gcc version 3.4.6 20060404 (Red Hat 3.4.6-10)

# g++ -Wall -Wextra -g -o test test.cpp
test.cpp:37: warning: unused parameter 'argc'
test.cpp:37: warning: unused parameter 'argv'

# ./test
1 val = 0, oldv = 0, newv = 20
2 val = 20, oldv = 0, newv = 20
3 val = 20, oldv = 20, newv = 20

However, on the new CentOS 6.3 environment:
# g++47 -v
Using built-in specs.
COLLECT_GCC=g++47
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i686-redhat-linux4.7.0/4.7.0/lto-wrapper
Target: i686-redhat-linux4.7.0
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-bootstrap --enable-shared
--enable-threads=posix --enable-checking=release --disable-build-with-cxx
--with-system-zlib --enable-__cxa_atexit --enable-languages=c,c++
--disable-profiling --enable-ld --disable-libgcj --disable-java --disable-gcj
--disable-libgcj-multifile --disable-plugin --enable-linker-build-id
--with-tune=generic --with-arch=i686 --build=i686-redhat-linux4.7.0
Thread model: posix
gcc version 4.7.0 20120507 (Red Hat 4.7.0-3) (GCC)

# g++47 -Wall -Wextra -g -fno-strict-aliasing -fwrapv -o test test.cpp
test.cpp:36:5: warning: unused parameter âargcâ [-Wunused-parameter]
test.cpp:36:5: warning: unused parameter âargvâ [-Wunused-parameter]

# ./test 
1 val = 0, oldv = 0, newv = 20
Segmentation fault (core dumped)

GDB print following info:
(gdb) r
Starting program: /home/share/tmp/test 
1 val = 0, oldv = 0, newv = 20

Program received signal SIGSEGV, Segmentation fault.
0x08048831 in MyAtomic_CAS64 (tgt=0xbffff610, old=0xbffff608, rep=20) at
test.cpp:31
31            : "memory", "edx", "esi", "edi", "cc");

Thanks!