问题
Building an app in Xcode 6.3 gets stuck for several minutes (approx. 10mins) on a step Merge MyApp.swiftmodule:
MergeSwiftModule normal x86_64 /Users/.../Library/Developer/Xcode/DerivedData/MyApp-crbdsfrhkvpiynaffvhzzsspiels/Build/Intermediates/MyApp.build/Debug-iphonesimulator/MyApp.build/Objects-normal/x86_64/MyApp.swiftmodule
this wasn't an issue in previous version of Xcode 6.2 and Swift 1.0.
回答1:
Enabling SWIFT_WHOLE_MODULE_OPTIMIZATION for the target seems to fix this issue.
Source: https://devforums.apple.com/message/1119343#1119343
来源：https://stackoverflow.com/questions/29767367/mergeswiftmodule-building-a-swift-app-in-xcode-6-3-gets-stuck-in-merge-myapp