> 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. > 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 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). // Martin _______________________________________________ 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".
