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I got this error on Xcode, after updating my buddy's code from svn and building it.

clang: error: unable to execute command: Segmentation fault: 11

clang: error: linker command failed due to signal

The changes were only on 2 class's implementation files. I tried reverting the code using svn up, cleaning and rebuilding it. (Heck, I even tried restarting Xcode, still I was getting the same issue.) But the next day the updated version was working fine. And I have no clue of what happened!

I want to know why this error occurred and how did it vanish after a system restart?

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No Sure about your particular error. But mine was due to two external library was conflicting. Its less xcode error but more command line error in build tool chain. I would suggest to remove external libraries one by one and see what is causing the issue. In my case once I removed culprit library. It built fine. good luck

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