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From: "anton.katilin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/55339] New: Generated code hangs with -O2 on Linux ppc
Date: Thu, 15 Nov 2012 11:24:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55339

             Bug #: 55339
           Summary: Generated code hangs with -O2 on Linux ppc
    Classification: Unclassified
           Product: gcc
           Version: 4.7.2
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: anton.katilin@gmail.com


Please find attached a test program and _compile.sh to compile it.

_compile.sh produces 2 output files: test-O2.bin and test-O1.bin, compiled with
-O2 and -O1 respectively.

test-O1.bin works just fine:

$ ./test-O1.bin
entering...
exception caught, as expected
OK
$

test-O1.bin hangs:

$ ./test-O2.bin

entering...
<hangs forever at this point...>

$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/opt/gcc-4.7.2/libexec/gcc/powerpc64-unknown-linux-gnu/4.7.2/lto-wrapper
Target: powerpc64-unknown-linux-gnu
Configured with: ../gcc-4.7.2/configure --prefix=/opt/gcc-4.7.2
--enable-threads=posix --disable-libunwind-exceptions --with-system-zlib
--enable-__cxa_atexit --enable-languages=c,c++ --enable-multilib
Thread model: posix
gcc version 4.7.2 (GCC)

$ uname -a
Linux localhost.localdomain 2.6.29-3.ydl61.3 #1 SMP Thu Jun 25 12:22:41 EDT
2009 ppc64 ppc64 ppc64 GNU/Linux