title: swift-stdlib-tool failed with exit code 1
body: <p>I have a problem with XCode since 2 days.
  I upgraded my iOS Developer Account, and now I can't build on my iphone.
  I have this when I try to build.</p>
  <pre><code>/Users/RpX/Library/Developer/Xcode/DerivedData/Moukat-amxiyucfcmxblndkiauwhwnscwhx/Build/Products/Debug-iphoneos/Moukat.app/Frameworks/libswiftCore.dylib: the codesign_allocate helper tool cannot be found or used
  *** error: Couldn't codesign /Users/RpX/Library/Developer/Xcode/DerivedData/Moukat-amxiyucfcmxblndkiauwhwnscwhx/Build/Products/Debug-iphoneos/Moukat.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
  </code></pre>
  <p>I tried all solutions on Stackoverflow about certificats, build settings, etc ..., it doesn't work.
  If someone know something about it =).
  Thank you.</p>