Anastasia added inline comments.

================
Comment at: lib/Sema/SemaDecl.cpp:2157
   if (getDiagnostics().getSuppressSystemWarnings() &&
-      (Context.getSourceManager().isInSystemHeader(Old->getLocation()) ||
+      // Some standard types are defined implicitly in Clang (e.g. OpenCL).
+      (Old->isImplicit() || New->isImplicit() ||
----------------
ahatanak wrote:
> Is it necessary to check whether New is implicit? I was just wondering when 
> or how an implicit definition would redefine a typedef.
I had a thought on it too, and I am not sure actually. This can happen if we 
implicitly define something from the standard headers. But I believe the Sema 
initialization should always happen before parsing the standard header or even 
loading them from the PCH. So I guess this shouldn't ever happen really? 
Perhaps, I should just remove this?


https://reviews.llvm.org/D31397



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