prepare for integration into FS

[yhuang43]

handle ARM64 Mac build

[ste93ste]

The PR is causing the CI to stall for Mac OS.
Do we need to add additional flags in https://github.com/freesurfer/samseg/blob/dev/.github/workflows/macos_build.sh?

[yhuang43]

I added this section to CMakeLists.txt. But if CMAKE_C_COMPILER and CMAKE_CXX_COMPILER are not passed, it goes into infinite configuration loop. Any suggestions? Maybe change setup.py to detect the platform, and hard-coded there?

if(APPLE)
set(CMAKE_C_COMPILER "/usr/bin/clang")
set(CMAKE_CXX_COMPILER "/usr/bin/clang++")

set -DAPPLE_ARM64=ON on cmake command line for arm64 build

if(APPLE_ARM64)
set(CMAKE_OSX_ARCHITECTURES "arm64")
add_definitions(-DARM64 -DDarwin -DPNG_ARM_NEON_OPT=0)
endif()
endif()

[yhuang43]

darwin_x86_64 works fine w/o the addition. I think I will just change the condition to the top condition to 'if(APPLE_ARM64)' instead of 'if(APPLE)'. But it will be using a different compiler than Freesurfer to compile the bindings.

[ste93ste]

Thanks for fixing it!