Bug 849041 – media-video/ffmpeg-4.4.2 /libavcodec/x86/vp9itxfm.asm:(.text+0x2ef53): relocation truncated to fit: R_X86_64_PC32 against symbol `ff_pd_8192' defined in .rodata section in libavcodec/x86/constants.o

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Frank Krömmelbein 2022-06-01 17:45:46 UTC]

Update from media-video/ffmpeg-4.4.1-r5 to 4.4.2 fails for me on this old system:

libavcodec/x86/vp9itxfm.o: in function `ff_vp9_idct_idct_32x32_add_avx.loop2_full':
src/libavcodec/x86/vp9itxfm.asm:(.text+0x2ef53): relocation truncated to fit: R_X86_64_PC32 against symbol `ff_pd_8192' defined in .rodata section in libavcodec/x86/constants.o
collect2: error: ld returned 1 exit status
make: *** [/var/tmp/portage/media-video/ffmpeg-4.4.2/work/ffmpeg-4.4.2/ffbuild/library.mak:103: libavcodec/libavcodec.so.58] Error 1


Reproducible: Always

[Comment 1 Frank Krömmelbein 2022-06-01 17:46:29 UTC]

Created attachment 782078 [details]
ffmpeg.tar.gz

[Comment 2 Sam James 2022-06-02 04:24:00 UTC]

Huh.

For the 32-bit build, you have --disable-avx2 (but NOT --disable-avx).
For the 64-bit build, you have --disable-avx (but NOT --disable-avx2).

I think AVX can work on 32-bit, but it's possible that ffmpeg's assembly doesn't care about that case.

[Comment 3 Frank Krömmelbein 2022-06-02 19:05:18 UTC]

(In reply to Sam James from comment #2)
> Huh.
> 
> For the 32-bit build, you have --disable-avx2 (but NOT --disable-avx).
> For the 64-bit build, you have --disable-avx (but NOT --disable-avx2).
> 
> I think AVX can work on 32-bit, but it's possible that ffmpeg's assembly
> doesn't care about that case.

Hi,
thank you very much for your analysis!
That probably also explains why I only have this error on this one old system.
It looks like a regression then.
Do you think I should open a ticket for this at upstream?

[Comment 4 Frank Krömmelbein 2022-08-02 20:51:37 UTC]

I tried to compile it again today, and it worked!

-> Fixed.