[cfe-commits] [PATCH] Warn on non-compatible returns from extern "C" functions

[Aaron Ballman]

MSVC will warn the user when a declared return type of an extern "C"
function is not C-compatible
(http://msdn.microsoft.com/en-us/library/1e02627y(v=vs.100).aspx).
This patch adds the same style of warning to clang, under the
-Wreturn-type group, with test cases.

Is there a better way for me to check whether a type is "C compatible?"

Thanks!

~Aaron
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