[mythtv] Weird avcodec compile problem

[Geoffrey Hausheer]

On Sat, 20 Dec 2003 02:23:29 +0100, "Kenneth Aafløy" said:
> 
> Geoffrei Haushner wrote:
> 
> > Yeah, but it is pretty hard to debug problems with -O3 set 
> > (it reorders
> > the execution commands)
> > 
> > For some reason dsputil_mmx.c won't compile without a '-O' 
> > setting (and
> > '-O0' doesn't work).
> > 
> > I suppose I could just disable MMX for debug, but that'll kill my
> > performance, and valgrind supoorts MMX ok nowadays.
> 
> Try forcing mmx with debug flags adding to settings.pro:
> 
> QMAKE_C[?:XX]FLAGS_DEBUG += -mmmx
> 
Nope, no luck:
gcc -c -pipe -w -mmmx -g -DHAVE_AV_CONFIG_H -I.. -D_FILE_OFFSET_BITS=64
-D_LARGEFILE_SOURCE -D_GNU_SOURCE -D_REENTRANT  -D_GNU_SOURCE
-D_FILE_OFFSET_BITS=64 -DPREFIX=\"/usr/local\" -DMMX -DQT_THREAD_SUPPORT
-DQT_SHARED -DQT_NO_DEBUG -I/usr/share/qt3/mkspecs/default -I. -I../..
-I../../../../../../include/qt3 -o dsputil_mmx.o i386/dsputil_mmx.c
i386/dsputil_mmx.c: In function `h263_h_loop_filter_mmx':
i386/dsputil_mmx.c:610: error: can't find a register in class
`GENERAL_REGS' while reloading `asm'

Is this a gcc bug?  I know nothing about inline assembly, and this
message is meaningless to me.  Seems pretty weird to require an
optimization flag tho.

.Geoff