When building my project for iOS only, everything's fine. When adding the Mac option, there is a strange warning:
ld: warning: directory not found for option '-L/Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/undefined'
So, what is that undefined thing Xcode is looking for? And how to fix it? Or is it simply a bug in Xcode?
