erichkeane added inline comments.

Comment at: lib/AST/MicrosoftMangle.cpp:1717
+        Out << '8';
+        for (const char *NS : {"__swift_cc", "__Swift"})
+          mangleSourceName(NS);
rsmith wrote:
> erichkeane wrote:
> > When I implemented regcall, it was brought up that this was likely a bad 
> > idea, and to just choose a letter for mangleCallingConvention.  It is a 
> > really stable list as it is, and if you avoid ones in the immediate 
> > pattern, you'll be fine.
> If you can get someone at Microsoft to sign off on us using a specific 
> letter, that seems fine. Otherwise, because we don't define the ABI, we don't 
> get to invent extensions to it, and we should instead pick something (like 
> this) that we can be confident won't conflict with future official mangling 
> extensions
Hmm... well, when we did it with RegCall, we didn't get them to 'sign off' so 
to speak, but simply alerted them about it after the fact and they promised to 
keep an eye on it.

  rC Clang

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