03698: NOWERROR=1 casues -fno-strict-aliasing to be dropped

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
03698	Compiling	Minor	Always	Jan 30, 2010, 15:53	Mar 1, 2010, 21:59

Tester	belegdol	View Status	Public	Platform	SDLMAME
Assigned To	couriersud	Resolution	Fixed	OS	Linux
Status [?]	Resolved			Driver
Version	0.136u2	Fixed in Version	0.136u4	Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	03698: NOWERROR=1 casues -fno-strict-aliasing to be dropped
Description	The hunt for this bug is described in the forums: http://www.bannister.org/forums/ubbthreads.php?ubb=showflat&Number=58738 Anyway, the bottom point is that if you add NOWERROR=1 to the make line, -fno-strict-aliasing will not be applied. This will initially manifest as warnings during the compilation. More fun begins when you add OPTIMIZE=2 to the mix. Then, poly.c using games (scud and mk4, at least) will lock up few moments after the 3d graphics shows up. Attaching gdb to the frozen process will show a backtrace beginning with the following lines: (gdb) bt #0 osd_work_queue_wait (queue=0xbc8e500, timeout=<value optimized out>) at src/osd/sdl/sdlwork.c:280 #1 0x0000000000c424b3 in poly_wait (poly=0xba124a0, debug_reason=<value optimized out>) at src/emu/video/poly.c:416
Steps To Reproduce	make -j3 NOWERROR=1 for strict aliasing only. make -j3 NOWERROR=1 OPTIMIZE=2 for freezes.
Additional Information	This was discovered on an up-to-date Fedora 12 x86_64 installation: $ gcc --version gcc (GCC) 4.4.2 20091222 (Red Hat 4.4.2-20) Copyright (C) 2009 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. I use OPTIMIZE=2 for the RPM package I maintain so that the optimisation level does not interfere with system-wide $RPM_OPT_FLAGS. And before you ask, these flags have nothing to do with the problem - MAME built with these (with -Werror patched out of course) and OPTIMIZE=2 works perfectly fine.
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