[Ffmpeg-devel] compile problems with x86 asm code?

[Michael Niedermayer]

Hi

On Friday 22 July 2005 15:41, Ronald S. Bultje wrote:
> Hi,
>
> According to http://bugzilla.gnome.org/show_bug.cgi?id=308415 (comment
> #9 an further), ffmpeg CVS of last wednesday (july 20th '05 around 4:00
> PM GMT) does not compile for some gcc versions. The compile error is in
> libavcodec/i386/dsputil_mmx.c, and even occurs when -fomit-frame-pointer
> is specified (in combination with -fPIC). In previous cases (and
> previous snapshots I've used), -fomit-frame-pointer would always work
> around similar compile errors. Removing -fPIC fixes it:
>
> gcc -DHAVE_CONFIG_H -I. -I. -I../.. -I../../libavcodec
> -DHAVE_AV_CONFIG_H=1
> -fomit-frame-pointer -Wall -Wno-switch -msse -g -O2 -MT
> libmmxsse_la-dsputil_mmx.lo -MD -MP -MF .deps/libmmxsse_la-dsputil_mmx.Tpo
> -c dsputil_mmx.c  -fPIC -DPIC -o .libs/libmmxsse_la-dsputil_mmx.o
>
> leads to:
>
> dsputil_mmx.c:618: error: can't find a register in class 'GENERAL_REGS'
> while reloading 'asm'
> dsputil_mmx.c:618: error: can't find a register in class 'GENERAL_REGS'
> while reloading 'asm'
>
> Is removing -fPIC the only solution, or is this a gcc bug, or possibly a
> ffmpeg bug?

gcc bug

[...]

-- 
Michael