我昨天将Mac升级到10.10.3,Xcode升级到6.3.1; 今天我不能使用git,codesign_allocate....等等.
`sh: line 1: 18421 Abort trap: 6 /Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.3.sdk -find codesign_allocate 2> /dev/null
codesign_allocate: error: unable to find utility "codesign_allocate", not a developer tool or in PATH
/Users/ylx/Library/Developer/Xcode/DerivedData/test-ahpvhmtqeafuveekexklyxulvmfa/Build/Products/Debug-iphoneos/test.app/Frameworks/libswiftCore.dylib: the codesign_allocate helper tool cannot be found or used
*** error: Couldn't codesign /Users/ylx/Library/Developer/Xcode/DerivedData/test-ahpvhmtqeafuveekexklyxulvmfa/Build/Products/Debug-iphoneos/test.app/Frameworks/libswiftCore.dylib: codesign failed with exit code 1
Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-stdlib-tool failed with exit code 1`