Build fat static library (device + simulator) using Xcode and SDK 4+

Question

It appears that we can - theoretically - build a single static library that includes both simulator and iPhone and iPad.

However, Apple has no documentation on this

Answer 1

XCode 12 update:

If you run xcodebuild without -arch param, XCode 12 will build simulator library with architecture "arm64 x86_64" as default.

Then run xcrun -sdk iphoneos lipo -create -output will conflict, because arm64 architecture exist in simulator and also device library.

I fork script from Adam git and fix it.