On 2007-08-19 18:41, Kevin Brosius wrote: > On 2007-08-19 10:50, Graham Evans wrote: > > > > > > > > ffmpeg/libavcodec/.libs/libavcodec.a(fdct_mmx.o): relocation > > > R_X86_64_32 against `a local symbol' can not be used when making a > > > shared object; recompile with -fPIC > > > > > > ffmpeg/libavcodec/.libs/libavcodec.a(fdct_mmx.o): could not read > > > symbols: Bad value > > > > > > did not look into it but must be a change after my patch from earlier > > > this year. > > > > > > j > > > > > I'm pretty sure I can help with this one - by reposting a patch posted > > earlier by Hermann (easier than tracking down and constructing a useful > > link). > > > > Around the time of cinelerra svn 1000 I switched from fedora to debian > > sid and couldn't compile cinelerra anymore. My distro is debian sid > > pure 64 on an amd64smp/openGL system. I was having all sorts of fpic > > and ffmpeg problems exactly like the one above. Hermann had a patch > > which only changed one line in a makefile and that fixed all my > > problems. It looks like this patch has not been committed. Perhaps it > > will help you (attached). > > > > I'm not sure why this patch is not committed - perhaps there is some > > uncertainty whether it is sound for all build systems. > > > > With this patch I have been building all recent svn versions up to svn > > 1017 without any compile flags. > > > > best of luck and please send in any feedback which might help this patch > > get evaluated. > > Thanks Graham, > > I suspect no one knew the full impact of this change. > > I think it will fix my build problem also. > > Does anyone have a system that builds without -fPIC on a 64 bit platform > (either amd64 or Intel?) I think that is the only case that may break > with the change. I don't see any results for this case, although there > are some comments that fPIC should not be needed in all cases. >
Well, this has been a long and somewhat painful investigation. :) I can answer why the original patch is not or should not be committed as is, Graham. It breaks 32 bit intel/amd platform builds. I've extended it and will commit a change that should work on all intel/amd 32 and 64 bit systems. Please let me know if anyone sees trouble with builds afterwards. The short version, is that ffmpeg/libavcodec in our tree needs -prefer-non-pic for 32 bit platforms, but not 64 bit (on the platforms I tested and for the people who reported in this thread.) If you disable PIC completely on 64 bit platforms, you will normally fail to link, either the ffmpeg portion or a higher level library. On 32bit, it's a little more complicated. ffmpeg/avcodec builds with PIC, but selectively. The mpegvideo_mmx file can not build with PIC, else it will not have enough registers to compile successfully. The -prefer-non-pic causes ffmpeg to build some files with PIC and some without, mpegvideo_mmx being built without PIC. I suspect you can break the build by overriding all this with one of --with-pic or --without-pic on the top level configure. Thanks to all for the feedback and build logs. -- Kevin _______________________________________________ Cinelerra mailing list Cinelerra@skolelinux.no https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
