> > On Oct 1, 2019, at 23:07, Lukas Fellechner <lukas.fellech...@gmx.net> wrote: > > > > This has worked very well for quite a long time. But after upgrading to > > FFmpeg 4.2, the build fails. A lot of changes and additions have been done > > for ARM/NEON 64-bit, and it looks like many of them are not compatible with > > armasm64. First I had to fix gas-preprocessor, a patch has been submitted > > today. But now, many other errors occur, which have to do with the ARM64 > > assembly code itself. I don’t have any knowledge of ARM/NEON assembly code, > > so I cannot help much with the investigation or fixes. > > The issue you posted about, and the other arm64 assembler issue you’ve > linked, are already fixed since a very long time in libav’s gas-preprocessor, > https://git.libav.org/?p=gas-preprocessor.git;a=summary.
Thank you, I tried with that updated gas-preprocessor and indeed all compile errors on ARM64 went away! > > On ARM platform, I also see build errors. Interestingly, those files have > > not even changed. Only the referenced file libavutil/arm/asm.S has changed. > > Even when I undo the last changes there, the build still fails, so I am out > > of ideas here right now. When I switch back to FFmpeg 4.1.4, everything > > builds fine. Maybe there is a config change which causes those errors? > > Errors with ARM target (32 bit): > > > > C:\Source\FFmpegInterop-lukasf\ffmpeg\Output\Windows10\ARM\libavcodec\arm\ac3dsp_arm.o.asm(72) > > : error A2173: syntax error in expression > it gt > > This seems to be a new regression in armasm in MSVC 2019 16.3 (released a > couple weeks ago), see > https://developercommunity.visualstudio.com/content/problem/757709/armasm-fails-to-handle-it-instructions.html. > I don’t see how it would work for you with an earlier version of FFmpeg > though, maybe those files are around from an earlier build and you didn’t try > doing a full rebuild? You are right, I was mainly testing with ARM64, so I did not notice that even FFmpeg 4.1.4 fails to build on ARM (32 bit). I need to roll back to the older build tools to build ARM platform successfully for now. > You can apply > https://lists.libav.org/pipermail/libav-devel/2019-October/086581.html on > your copy of gas-preprocessor to work around this issue, but I’m not sure if > it’s worth keeping the fix permanently (if the bug gets fixed in 16.4). Thank you! Best Regards Lukas _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
