[PATCH] [COMPILER-RT] Fix CMake build for Apple/Darwin without Xcode and for universal build

[Kuba Brecka]

I just tried building without this patch on a OS X 10.10 system, without Xcode, just CLTools installed, and compiler-rt builds fine for me.  Can you tell what is your OS version, CLTools version, CMake configure line, and the exact error message that you are getting?

It seems to me that when xcrun or xcodebuild returns an error message, it goes to stderr which is suppressed with `ERROR_FILE /dev/null` and the result string really is an empty string in case of an error.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8936

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