swift/clang build multi arch system library/executable

clang

clang -O2 -Wall -framework AppKit -framework Foundation -dynamiclib -arch x86_64 -arch arm64 -o main main.m

swift

swift build -c release --arch arm64
swift build -c release --arch x86_64
lipo -create --output fat-exe .build/arm64-apple-macosx/release/thin .build/x86_64-apple-macosx/release/thin