It is part of the linker stage so each rebuild should produce an unique UUID.  
Note, the MacOS X linker actually makes the UUID by checksumming the binary - 
minus some obvious bits the linker knows to contain timestamps - so if you 
rebuild the same sources with the same compiler & compiler options, you will 
get the same UUID.  This can cause some confusion, for instance changing just a 
comment and rebuilding will produce the same UUID...  That is an implementation 
detail, however, and usually doesn't cause problems...

Jim


http://reviews.llvm.org/D7574

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