kfr Build issue on macOS when targetting x64 from ARM mac

I'm seeing the following in my build log, when building with -DCMAKE_OSX_ARCHITECTURES="x86_64;arm64" :

-- Default CPU architecture for KFR is neon64 (set KFR_ARCH to override)
  Incorrect architecture set by KFR_ARCH: neon64

Most likely the cpu detector should handle rosetta ? Also, I wonder, how is the lib supposed to handle fat macOS binaries ?

thanks !

Jul 16 '24 08:07 jcelerier

Fat binaries aren't supported at this moment because KFR requires specific compiler flags to enable SIMD and these flags are platform-specific. CMake doesn't provide a convenient way to set arch-specific flags. So CMAKE_OSX_ARCHITECTURES should be set to either x86_64 or arm64 in a single build. Note that binaries built this way can be easily merged into a fat library.

Jul 17 '24 12:07 dancasarin

Hi,

KFR 7 supports fat binaries, see latest release.

How to enable when building: https://github.com/kfrlib/kfr/blob/main/docs/docs/kb.md#how-to-build-kfr-on-macos-with-universal-binaries

Oct 29 '25 13:10 dancasarin