[Bug c++/54569] New: Compiling code with -O3 results to segfault in MAME/MESS binary

["agarcia at igalia dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54569

             Bug #: 54569
           Summary: Compiling code with -O3 results to segfault in
                    MAME/MESS binary
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: agarcia@igalia.com


Created attachment 28190
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28190
Preprocessed source file

Debian bug: http://bugs.debian.org/686645

MAME / MESS segfault when compiled with -O3 using GCC 4.7.1. The problem
doesn't seem to happen with GCC < 4.7

GCC version:

Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.7.1-8'
--with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs
--enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.7 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object
--enable-plugin --enable-objc-gc --enable-targets=all --with-arch-32=i586
--with-tune=generic --enable-checking=release --build=i486-linux-gnu
--host=i486-linux-gnu --target=i486-linux-gnu
gcc version 4.7.1 (Debian 4.7.1-8)

Command line that triggers the bug:

gcc -DCRLF=2 -DINLINE="static inline" -DLSB_FIRST -DNDEBUG -DUSE_SYSTEM_JPEGLIB
-DSDLMAME_SDL2=0 -DDISTRO=generic -DSDLMAME_ARCH=-march=pentium2
-DSYNC_IMPLEMENTATION=tc -DSDLMAME_UNIX -DUSE_OPENGL=1 -DUSE_DISPATCH_GL=1
-DSDLMAME_X11 -DNATIVE_DRC=drcbe_x86 -pipe -O3 -fno-strict-aliasing
-march=pentium2 -Wall -Wcast-align -Wundef -Wformat-security -Wwrite-strings
-Wno-sign-compare -Wno-conversion -DINI_PATH="/etc/mess" -D_GNU_SOURCE=1
-D_REENTRANT -m32 -pthread -pthread -Isrc/mess -Iobj/sdl/mess/layout -Isrc/emu
-Iobj/sdl/emu -Iobj/sdl/emu/layout -Isrc/lib/util -Isrc/lib -Isrc/osd
-Isrc/osd/sdl -Isrc/debug -include src/osd/sdl/sdlprefix.h -I/usr/include
-I/usr/include/gtk-2.0 -I/usr/lib/i386-linux-gnu/gtk-2.0/include
-I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0
-I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/glib-2.0
-I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/pixman-1
-I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/gconf/2
-I/usr/include/dbus-1.0 -I/usr/lib/i386-linux-gnu/dbus-1.0/include
-I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include
-I/usr/X11/include -I/usr/X11R6/include -I/usr/openwin/include -Isrc/mame
-Iobj/sdl/mame/layout -Isrc/mess/osd -Isrc/mess/osd/sdl -Isrc/mess/tools
-Isrc/mess/tools/imgtool -Isrc/mess/tools/castool -Isrc/mess/tools/floptool -x
c++ -std=gnu++98 -Woverloaded-virtual -c src/emu/ioport.c -o
obj/sdl/emu/ioport.o

(no compiler output).

The problem disappears if the file is compiled without -O3 or with -O3
-fno-ipa-cp-clone.

It also disappears if you remove the '__attribute__((optimize("O0")))' line
from the source file.

You can see a few more details -including a backtrace- in the Debian bug report
(http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=686645#60).