[FFmpeg-trac] #11302(avcodec:new): RISCV: Properly set relocate parameter of const macro in libavcodec/riscv/h264dsp_rvv.S

[FFmpeg]

#11302: RISCV: Properly set relocate parameter of const macro in
libavcodec/riscv/h264dsp_rvv.S
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             Reporter:  kxxt     |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  avcodec  |                  Version:  git-master
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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 Summary of the bug:

 I am building chromium for riscv64 which builds ffmpeg using its own build
 system. I encountered the following error:

 ld.lld: error: relocation R_RISCV_64 cannot be used against symbol
 'ff_h264_weight_pixels16_8_rvv'; recompile with -fPIC
 >>> defined in
 obj/third_party/ffmpeg/libffmpeg_internal.a(ffmpeg_internal/h264dsp_rvv.o)
 >>> referenced by
 ffmpeg_internal/h264dsp_rvv.o:(ff_h264_weight_funcs_8_rvv) in archive
 obj/third_party/ffmpeg/libffmpeg_internal.a

 It is caused by
 https://github.com/FFmpeg/FFmpeg/blob/7332b1700e3b257dd80341f40305cf0bf4582fcf/libavcodec/riscv/h264dsp_rvv.S#L163-L176
 which uses the const macro from libavutil/riscv/asm.S without enabling
 relocatable parameter.

 Could we enable the relocatable parameter unconditionally here? Or would
 it break the build in position dependent code mode?
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11302>
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