[Bug 48693] -O2 optimization breaks 32 bit wine 3D on 64 bit system

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=48693

--- Comment #4 from Christoph Haag <haagch.christoph at googlemail.com> 2012-04-16 02:50:15 PDT ---
(In reply to comment #3)
> Does it work with -O2 -fno-strict-aliasing? The Mesa tree is known not to be
> strict aliasing clean. If that's not it, maybe you can isolate the specific
> optimization enabled by -O2 but not -O1 which triggers the crash.
> 
> I suspect this bug may be invalid anyway though: you shouldn't set CFLAGS
> directly but use OPT_FLAGS and friends.

Well, I set it to -O2 for testing. Archlinux does set the CFLAGS so if this is
wrong, Archlinux is doing it wrong?

Archlinux's default CFLAGS are by the way:
CFLAGS="-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector
--param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2"
(I personally use -march=native)

So I tried setting my CFLAGS to CFLAGS="$CFLAGS -fno-strict-aliasing".

Compiling lib32 mesa looks like this now:

gcc -m32 -c -I. -I../../../src/gallium/include -I../../../src/gallium/auxiliary
-I../../../src/gallium/drivers  -march=native -fomit-frame-pointer -O2 -pipe
-fstack-protector --param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2
-fno-strict-aliasing -Wall -std=c99 -Werror=implicit-function-declaration
-Werror=missing-prototypes -fno-strict-aliasing -fno-builtin-memcmp -m32
-march=native -fomit-frame-pointer -O2 -pipe -fstack-protector
--param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2 -fno-strict-aliasing  -fPIC -m32
-DUSE_X86_ASM -DUSE_MMX_ASM -DUSE_3DNOW_ASM -DUSE_SSE_ASM -D_GNU_SOURCE
-DPTHREADS -DTEXTURE_FLOAT_ENABLED -DHAVE_POSIX_MEMALIGN -DIN_DRI_DRIVER
-DUSE_XCB -DGLX_INDIRECT_RENDERING -DGLX_DIRECT_RENDERING -DGLX_USE_TLS
-DPTHREADS -DUSE_EXTERNAL_DXTN_LIB=1 -DIN_DRI_DRIVER -DHAVE_ALIAS
-DHAVE_MINCORE -DHAVE_LIBUDEV -DHAVE_XEXTPROTO_71 -D__STDC_CONSTANT_MACROS
-DHAVE_LLVM=0x0300 -fvisibility=hidden -I/usr/include   -D_GNU_SOURCE
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
util/u_rect.c -o util/u_rect.o



-fno-strict-aliasing does not fix the wine crashes.

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