hans added inline comments.

================
Comment at: lib/Frontend/CompilerInvocation.cpp:2862
+  Opts.PCHWithHdrStopCreate =
+      Args.getLastArgValue(OPT_pch_through_hdrstop_EQ) == "create";
   Opts.PCHThroughHeader = Args.getLastArgValue(OPT_pch_through_header_EQ);
----------------
mikerice wrote:
> hans wrote:
> > hmm, what if the value is not "create", but also not "use" but something 
> > else? maybe that should be diagnosed, or maybe the flag should be split 
> > into two?
> I am not totally happy with this but I thought one option might be a little 
> better than two.  It would be equivalent to create two options 
> OPT_pch_through_hdrstop_create and OPT_pch_through_hdrstop_use if that seems 
> better (or more usual) to everyone.  I added a diagnostic if the value is not 
> "create" or "use".  A user should never see that though if the front end and 
> driver as in sync.
Thinking about it again, having two separate flags seems more common to me.


https://reviews.llvm.org/D51391



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