> Date: Mon, 6 May 2013 09:18:58 -0400 > From: dri...@cenatav.co.cu > To: libav-user@ffmpeg.org > Subject: Re: [Libav-user] compiling ffmpeg with -fPIC > > Hi Gavin!! > > I set > > -shared -Wl,-Bsymbolic > > in the linker flags of my library, that depends of libavcodec, libavutil, > libavformat... > > However when Im going to call av_register_all(); I get the same error: > /usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against > symbol `ff_pd_1' can not be used when making a shared object; recompile > with -fPIC > > /////// > > I think that I have to set the flag -fPIC for compiling the libavcodec, > libavutil, libavformat, so I added: enable pic , in the configure file of the > ffmpeg project: > > # OS specific > case $target_os in > linux) > add_cppflags -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 > enable pic > enable dv1394 > > > Therefore when ffmpeg is compiled, libavcodec, libavutil, libavformat were > compiled with -fPIC.... then when should be ok If I want to use them in my > libx.so ... but It is not, I have the same error: > > /usr/local/lib/libavcodec.a(lpc_mmx.o): relocation R_X86_64_PC32 against > symbol `ff_pd_1' can not be used when making a shared object; recompile > with -fPIC > > > I dont know wish is the problem with ffmpeg and -fPIC...
Hello, I'm new to the list. If you want to link objects in a static library into a shared library, I think you need to compile the static library using -mcmode=large. As .so can be loaded at an address above 4gig, 32-bit code pointers don't work. The linker can neither create 64-bit relocations from 32-bit relocations or change function calls from non-PIC to PIC. So it throws an error. Someone correct me if I'm wrong.
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