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> I'm trying to get ffmpeg, transcode and mplayer repackaged for amd64.
> ffmpeg fails with :
> gcc -shared -o libavcodec.so common.o utils.o mem.o allcodecs.o mpegvideo.o
> jrevdct.o jfdctfst.o jfdctint.o mpegaudio.o ac3enc.o mjpeg.o resample.o
> resample2.o dsputil.o motion_est.o imgconvert.o imgresample.o mpeg12.o
> mpegaudiodec.o pcm.o simple_idct.o ratecontrol.o adpcm.o eval.o dv.o
> error_resilience.o fft.o mdct.o mace.o huffyuv.o cyuv.o opts.o raw.o h264.o
> golomb.o vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o cljr.o
> roqvideo.o dpcm.o interplayvideo.o xan.o rpza.o cinepak.o msrle.o msvideo1.o
> vqavideo.o idcinvideo.o adx.o rational.o faandct.o 8bps.o smc.o parser.o
> flicvideo.o truemotion1.o vmdav.o lcl.o qtrle.o g726.o flac.o vp3dsp.o
> integer.o snow.o tscc.o sonic.o ulti.o h264idct.o qdrw.o xl.o rangecoder.o
> png.o pnm.o pthread.o h263.o h261.o msmpeg4.o h263dec.o svq1.o rv10.o
> wmadec.o indeo3.o a52dec.o liba52/bit_allocate.o liba52/bitstream.o
> liba52/downmix.o liba52/imdct.o liba52/parse.o liba52/crc.o
> liba52/resample.o dtsdec.o faad.o faac.o xvidff.o mp3lamea
> udio.o oggvorbis.o i386/fdct_mmx.o i386/cputest.o i386/dsputil_mmx.o
> i386/mpegvideo_mmx.o i386/idct_mmx.o i386/motion_est_mmx.o
> i386/simple_idct_mmx.o i386/fft_sse.o i386/vp3dsp_mmx.o i386/vp3dsp_sse2.o
> -lm -ldts -lz -lpthread -ldl -ldts -lfaac -lxvidcore -lmp3lame -lvorbis
> -lvorbisenc -Wl,--warn-common -rdynamic -Wl,-soname -Wl,libavcodec-cvs.so
> /usr/bin/ld: common.o: relocation R_X86_64_32 can not be used when making a
> shared object; recompile with -fPIC
> common.o: could not read symbols: Bad value
>
> My invironment includes
> CFLAGS=-fPIC
> CCFLAG=-fPIC
>
> Is this a configure problem, or how should I proceed to get -fPIC
> propagated down the chain in a apt-get source --build <package>?
>
I got this problem even with -fPIC with mythtv. Look for the MANGLE
macro. It refers to global constants. I set local variables equal to
the global values and added an asm "m" variable corresponding to the
local variable, and then it worked.
For a short example, see the usage of the variable otmp below. File is
motion_est_mmx.c. There are a lot of MANGLE's in dsputil_mmx.c and a
few in simple_idct_mmx.c.
static inline void sad8_4_mmx2(uint8_t *blk1, uint8_t *blk2, int stride,
int h)
{ //FIXME reuse src
long len= -(stride*h);
unsigned long otmp = bone;
asm volatile(
".balign 16 \n\t"
"movq %5, %%mm5 \n\t"
#if 0
"movq "MANGLE(bone)", %%mm5 \n\t"
#endif
"1: \n\t"
"movq (%1, %%rax), %%mm0 \n\t"
"movq (%2, %%rax), %%mm2 \n\t"
"movq 1(%1, %%rax), %%mm1 \n\t"
"movq 1(%2, %%rax), %%mm3 \n\t"
"pavgb %%mm2, %%mm0 \n\t"
"pavgb %%mm1, %%mm3 \n\t"
"psubusb %%mm5, %%mm3 \n\t"
"pavgb %%mm3, %%mm0 \n\t"
"movq (%3, %%rax), %%mm2 \n\t"
"psadbw %%mm2, %%mm0 \n\t"
"addq %4, %%rax \n\t"
"movq (%1, %%rax), %%mm1 \n\t"
"movq (%2, %%rax), %%mm3 \n\t"
"movq 1(%1, %%rax), %%mm2 \n\t"
"movq 1(%2, %%rax), %%mm4 \n\t"
"pavgb %%mm3, %%mm1 \n\t"
"pavgb %%mm4, %%mm2 \n\t"
"psubusb %%mm5, %%mm2 \n\t"
"pavgb %%mm1, %%mm2 \n\t"
"movq (%3, %%rax), %%mm1 \n\t"
"psadbw %%mm1, %%mm2 \n\t"
"paddw %%mm2, %%mm0 \n\t"
"paddw %%mm0, %%mm6 \n\t"
"addq %4, %%rax \n\t"
" js 1b \n\t"
: "+a" (len)
: "r" (blk1 - len), "r" (blk1 - len + stride), "r" (blk2 - len),
"r" ((long)stride), "m" (otmp)
);
}
Fred
