thakis added a comment.

(The reason that the predefines buffer doesn't override the value of 
`__STDC_HOSTED__` from the pch is that 
CompilerInstance::createPCHExternalASTSource overrides the predefines buffer 
with a different predefines buffer suggested by the ASTReader, usually an empty 
one.)


https://reviews.llvm.org/D27545



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