code works just fine if compiled with g++-4.2.0 --openmp but dies a horrible
death if you -02
valgrind output:
[EMAIL PROTECTED] ~/tmp $ valgrind ./test
==31611== Memcheck, a memory error detector.
==31611== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et al.
==31611== Using LibVEX rev 1471, a library for dynamic binary translation.
==31611== Copyright (C) 2004-2005, and GNU GPL'd, by OpenWorks LLP.
==31611== Using valgrind-3.1.0, a dynamic binary instrumentation framework.
==31611== Copyright (C) 2000-2005, and GNU GPL'd, by Julian Seward et al.
==31611== For more details, rerun with: -v
==31611==
OPENMP> Thread 0 finished
RHS 0
vex x86->IR: unhandled instruction bytes: 0x6C 0x3D 0x10 0x4
==31611== Invalid read of size 1
==31611== at 0x40FE91A: (within
/home/dev2/gcc-gomp-save/gomp-gcc-build/lib/libstdc++.so.6.0.7)
==31611== by 0x8049308: main.omp_fn.0 (in /home/dev2/tmp/test)
==31611== by 0x80495C6: main (in /home/dev2/tmp/test)
==31611== Address 0x8200381 is not stack'd, malloc'd or (recently) free'd
==31611==
==31611== Process terminating with default action of signal 11 (SIGSEGV)
==31611== Access not within mapped region at address 0x8200381
==31611== at 0x40FE91A: (within
/home/dev2/gcc-gomp-save/gomp-gcc-build/lib/libstdc++.so.6.0.7)
==31611== by 0x8049308: main.omp_fn.0 (in /home/dev2/tmp/test)
==31611== by 0x80495C6: main (in /home/dev2/tmp/test)
x[0]===31611==
==31611== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 25 from 1)
==31611== malloc/free: in use at exit: 16,128 bytes in 4 blocks.
==31611== malloc/free: 7 allocs, 3 frees, 16,838 bytes allocated.
==31611== For counts of detected errors, rerun with: -v
==31611== searching for pointers to 4 not-freed blocks.
==31611== checked 278,488 bytes.
==31611==
==31611== LEAK SUMMARY:
==31611== definitely lost: 0 bytes in 0 blocks.
==31611== possibly lost: 0 bytes in 0 blocks.
==31611== still reachable: 16,128 bytes in 4 blocks.
==31611== suppressed: 0 bytes in 0 blocks.
==31611== Reachable blocks (those to which a pointer was found) are not shown.
==31611== To see them, rerun with: --show-reachable=yes
Segmentation fault
--
Summary: [gomp] segfault in main.omp_fn.0 with -O2
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: other
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: dev at stuffit dot at
GCC host triplet: i686-pc-linux
GCC target triplet: i686-pc-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25527
