Bug#678249: (no subject)

[Alberto Garcia]

I've been trying to narrow the problem down and I found that
compiling MAME normally with the default options and then recompiling
src/emu/ioport.c with -fno-ipa-cp-clone fixes the issue.

So it's -fipa-cp-clone in ioport.c that is causing the problem.

This looks like a GCC bug to me, and I hope this information is enough
to report it and have it fixed, but if you need something else from me
let me know.

As a workaround, compiling MAME with -O2 or -fno-ipa-cp-clone would
also fix the bug (as a side note, the MAME binary is ~15% smaller when
compiled with -O2 instead of -O3 in i386).

I'm using gcc 4.7.1-2 in a i386 wheezy system (the kernel is 64bit,
though).

Ah, and I tried this fix with both MAME and MESS, and it works in both
cases.

$ dpkg-architecture
DEB_BUILD_ARCH=i386
DEB_BUILD_ARCH_BITS=32
DEB_BUILD_ARCH_CPU=i386
DEB_BUILD_ARCH_ENDIAN=little
DEB_BUILD_ARCH_OS=linux
DEB_BUILD_GNU_CPU=i486
DEB_BUILD_GNU_SYSTEM=linux-gnu
DEB_BUILD_GNU_TYPE=i486-linux-gnu
DEB_BUILD_MULTIARCH=i386-linux-gnu
DEB_HOST_ARCH=i386
DEB_HOST_ARCH_BITS=32
DEB_HOST_ARCH_CPU=i386
DEB_HOST_ARCH_ENDIAN=little
DEB_HOST_ARCH_OS=linux
DEB_HOST_GNU_CPU=i486
DEB_HOST_GNU_SYSTEM=linux-gnu
DEB_HOST_GNU_TYPE=i486-linux-gnu
DEB_HOST_MULTIARCH=i386-linux-gnu

$ uname -a
Linux hermes 3.2.0-2-amd64 #1 SMP Mon Jun 11 19:23:01 UTC 2012 x86_64 GNU/Linux

Berto