[FFmpeg-trac] #9612(undetermined:new): --enable-pic flag doesn't affect the object files from assembly

[FFmpeg]

#9612: --enable-pic flag doesn't affect the object files from assembly
-------------------------------------+-------------------------------------
             Reporter:  Tuğrul       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 I was trying to link a shared library to use with Node.JS.

 It was failing for following error message.

 {{{
 /usr/bin/ld: libavcodec.a(cavsdsp.o): relocation R_X86_64_PC32 against
 symbol `ff_pw_5' can not be used when making a shared object; recompile
 with -fPIC
 }}}


 Then I tried to use '''--disable-asm''' and it built successfully.

 How to reproduce:

 == Build with asm and no asm versions of static libraries.

 === With asm:
 {{{
 % make clean && ./configure --prefix="/tmp/deploy-asm" --pkg-config-
 flags="--static" --extra-cflags="-fPIC" --extra-libs="-lpthread -lm"
 --enable-gpl --enable-nonfree --disable-doc --enable-pic && make && make
 install
 }}}


 === Without asm:
 {{{
 % make clean && ./configure --prefix="/tmp/deploy-no-asm" --pkg-config-
 flags="--static" --extra-cflags="-fPIC" --extra-libs="-lpthread -lm"
 --enable-gpl --enable-nonfree --disable-doc --enable-pic --disable-asm &&
 make && make install
 }}}

 == Combine static libraries into a shared library

 === With asm:
 {{{
 % cd /tmp/deploy-asm/lib && gcc -shared -o libav-combined.so -Wl,--whole-
 archive libavcodec.a libavdevice.a libavfilter.a libavformat.a libavutil.a
 libpostproc.a libswresample.a libswscale.a -Wl,--no-whole-archive
 }}}

 Gives following error:
 {{{
 /usr/bin/ld: libavcodec.a(cavsdsp.o): relocation R_X86_64_PC32 against
 symbol `ff_pw_5' can not be used when making a shared object; recompile
 with -fPIC
 /usr/bin/ld: final link failed: bad value
 collect2: error: ld returned 1 exit status
 }}}

 === Without asm:

 {{{
 % cd /tmp/deploy-no-asm/lib && gcc -shared -o libav-combined.so -Wl
 ,--whole-archive libavcodec.a libavdevice.a libavfilter.a libavformat.a
 libavutil.a libpostproc.a libswresample.a libswscale.a -Wl,--no-whole-
 archive
 }}}

 It is successfully linked.

 I'm not expert but I'm able to imagine the problem by this Q&A
 https://stackoverflow.com/questions/38192735/generating-position-
 independent-code-with-gas-fpic
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9612>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker