How to check if a static library is built for 64-bit?

Question

I just built a static library for iOS with the build setting for Architectures set to $(ARCHS_STANDARD_INCLUDING_64_BIT).

I want to make sure that the

Answer 1

Yes, an arm64 slice is there. To see it, you need to use lipo from the iOS toolchain, not from the host system (which doesn’t know about arm64):

xcrun -sdk iphoneos lipo -info $(FILENAME)