Xcode fails without specifying and errors

Question

All of a sudden my project fails to build in Xcode. If I look at the log I see all the needed dependencies being built, and then I get a strange error:

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Answer 1

Mine gave this error sometimes, also LLVM failed with exit code 1 and clang failed with exit code 255, at different code locations each time. I just had to reboot (OS X 10.7, Xcode 4.5).