duplicates:

• SR-7961 Build Error: undefined_arch

Issue Description:

I ran the following build script command:

./swift/utils/build-script --skip-build-benchmarks --release --xcode --debug-swift

It eventually fails when building the swift stdlib with the following error (same for other Swift runtime files):

clang:-1: no such file or directory: '/Users/danielzheng/swift-dan/build/Xcode-ReleaseAssert+swift-DebugAssert/swift-macosx-x86_64/stdlib/public/runtime/Swift.build/Debug/swiftRuntime-macosx-x86_64.build/Objects-normal/undefined_arch/AnyHashableSupport.o'

The problem is "undefined_arch" is set instead of "x86_64", for some reason.
Currently, my manual fix is to open build/Xcode-ReleaseAssert+swift-DebugAssert/swift-macosx-x86_64/Swift.xcodeproj/project.pbxproj and manually replace all instances of "undefined_arch" with "x86_64".