This is perhaps worth at least raising for developer documentation. I managed with @a.harker 's help to build FrameLib for the M1 architecture. It is relatively simple to do - you just need to change some of the Xcode configurations.
Below is the diff of my
diff --git a/Config_FrameLib.xcconfig b/Config_FrameLib.xcconfig index fa6074da..ae7ea8b1 100755 --- a/Config_FrameLib.xcconfig +++ b/Config_FrameLib.xcconfig @@ -5,12 +5,12 @@ PRODUCT_NAME = $(TARGET_NAME) // Per architecture and deployment settings -ARCHS = i386 x86_64 +ARCHS = x86_64 -MACOSX_DEPLOYMENT_TARGET = 10.7 +MACOSX_DEPLOYMENT_TARGET = 11.1 CLANG_CXX_LANGUAGE_STANDARD = c++11 CLANG_CXX_LIBRARY = libc++ -CLANG_X86_VECTOR_INSTRUCTIONS = avx +CLANG_X86_VECTOR_INSTRUCTIONS = sse4.2 LLVM_LTO = Monolithic