[Libav-user] ffmpeg compilation failing when trying to build shared lib

[Kumar, Abhijeet]

thanks all for reply. i could fix it by giving -cc="gcc -m64 -fPIC" compiler flags. seems like PIC is needed.
________________________________
From: Libav-user <libav-user-bounces at ffmpeg.org> on behalf of David Rappo <davidr at lens-immersive.com>
Sent: Wednesday, March 24, 2021 5:48 PM
To: This list is about using libavcodec, libavformat, libavutil, libavdevice and libavfilter. <libav-user at ffmpeg.org>
Subject: Re: [Libav-user] ffmpeg compilation failing when trying to build shared lib

Not sure if it will make a difference but you could try adding --disable-static.

On Thu, Mar 25, 2021 at 8:32 AM Kumar, Abhijeet <amk7371 at psu.edu<mailto:amk7371 at psu.edu>> wrote:
hi, i'm trying to build as a dynamic library but compilation fails can you help??

[amk7371 at e5-cse-204-02 FFmpeg]$ ./configure --prefix=/home/mdl/amk7371/video_analytics/FFmpeg_x64 --enable-shared --disable-x86asm --enable-gpl --enable-pic

     ^
GEN libavdevice/libavdevice.ver
GEN libavfilter/libavfilter.ver
AR libavdevice/libavdevice.a
GEN libswscale/libswscale.ver
GEN libavutil/libavutil.ver
GEN libpostproc/libpostproc.ver
GEN libavformat/libavformat.ver
GEN libavcodec/libavcodec.ver
GEN libswresample/libswresample.ver
AR libswresample/libswresample.a
MAN doc/ffprobe-all.1
AR libavcodec/libavcodec.a
LD libavutil/libavutil.so.56
LD libswscale/libswscale.so.5
LD libpostproc/libpostproc.so.55
LD libswresample/libswresample.so.3
LD libavcodec/libavcodec.so.58
/usr/bin/ld: libavcodec/mqc.o: relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: libavcodec/mqcdec.o: relocation R_X86_64_32S against undefined symbol `ff_mqc_qe' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: libavcodec/svq13.o: relocation R_X86_64_32S against `.rodata' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
make: *** [libavcodec/libavcodec.so.58] Error 1
make: *** Waiting for unfinished jobs....


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