[FFmpeg-devel] macos build error relating to yasm

[James Almer]

On 4/27/2021 12:57 PM, Adam Bennett wrote:
> I'm getting a yasm related build error that I didn't hit when building
> ffmpeg on Windows.
> 
> I ran the following commands to build libav on a new Big Sur install after
> installing xcode command line tools:
> 
> ```
> brew install yasm
> brew install pkg-config
> ./configure --disable-everything --enable-libvpx
> --enable-encoder=libvpx_vp8 --enable-encoder=libvpx_vp9 --enable-muxer=webm
> make
> ```
> 
> This installed yasm 1.3.0 and pkg-config 0.29.2.
> 
> And I get this error from make:
> 
> ```
> libavutil/x86/tx_float.asm:842: error: undefined symbol `ff_cos_32_float'
> (first use)
> libavutil/x86/tx_float.asm:842: error:  (Each undefined symbol is reported
> only once.)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol `ff_cos_64_float'
> (first use)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol `ff_cos_128_float'
> (first use)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol `ff_cos_256_float'
> (first use)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol `ff_cos_512_float'
> (first use)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol
> `ff_cos_1024_float' (first use)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol
> `ff_cos_2048_float' (first use)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol
> `ff_cos_4096_float' (first use)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol
> `ff_cos_8192_float' (first use)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol
> `ff_cos_16384_float' (first use)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol
> `ff_cos_32768_float' (first use)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol
> `ff_cos_65536_float' (first use)
> libavutil/x86/tx_float.asm:1210: error: undefined symbol
> `ff_cos_131072_float' (first use)
> make: *** [libavutil/x86/tx_float.o] Error 1
> ```
> 
> This line (42) in tx_float.asm seems to provide the undefined symbol but
> truth be told I've never worked with a project using asm and not sure from
> what I've seen what the problem is.
> 
> cextern cos_ %+ i %+ _float ; ff_cos_i_float...

Have you tried the latest git master? This bug I'm sure i fixed in 
7a6ea6ce2a two days ago.