[PATCH] clang-cl: Only mark dllexported constexpr functions once

[Hans Wennborg]

Sorry, it seems I'm reading email in the wrong order today.

================
Comment at: lib/Sema/SemaDeclCXX.cpp:4745
@@ -4744,1 +4744,3 @@
       if (MD->isUserProvided()) {
+        // Don't mark constexpr functions again
+        if (MD->isConstexpr())
----------------
ehsan wrote:
> hans wrote:
> > The comment is a little vague (and should end with a period). Maybe something like "constexpr functions are already marked referenced."
> > 
> > Also, David pointed out that this does not only apply to user-defined functions, so it should be moved back to where you first suggested in the PR. Sorry for my misleading suggestion here before.
> What about http://llvm.org/bugs/show_bug.cgi?id=21718#c6?
Maybe what we should do is something like

if (MD->isReferenced())
  continue;

Would that pass all the old tests and your new one?

http://reviews.llvm.org/D6528