Dear All, I maintain a program and I seemed to have stumbled into some bug of either the program or gcc. Thanks to Vegard Nossum, we have a really small (101 lines, most of them empty) example to reproduce it. The bug appears when I compile the program with gcc 4.5.1 (I believe it appears for 4.5.0 and 4.5.2 as well), with -O2. The program is meant to print "success", but when compiled with -O2 it returns "failure", while for -O0 works fine. The file is available here: http://planete.inrialpes.fr/~soos/gcc/ as "Main.cpp" and "compile.sh". Machine it is compiled on: distribution: Fedora Core 14 gcc --version: gcc (GCC) 4.5.1 20100924 (Red Hat 4.5.1-4) uname -a: Linux localhost.localdomain 2.6.35.6-45.fc14.i686 #1 SMP Mon Oct 18 23:56:17 UTC 2010 i686 i686 i386 GNU/Linux This bug seemed to have been triggered in the original (>13'000 LOC) program by multiple people, using multiple 4.5.X versions, on different computers&distributions. Does anyone know why I get this bug? Could anyone confirm that this the bug triggers on their architecture, distribution, and compiler version (only >= 4.5.0 seems to be affected)? Thank you in advance, Mate -- Mate Soos Security Research Labs www.srlabs.de www.msoos.org
