[LLVMbugs] [Bug 21626] clang failed to compile Objective-C++ code with -fmodules

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21626

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |INVALID

--- Comment #5 from Richard Smith <richard-llvm at metafoo.co.uk> ---
The next problem is with the CoreFoundation module map. Again, this is an Apple
problem not a Clang one. The reason why this "works" with XCode 6.1 is that
-fmodules does nothing in C++ mode there.

Ultimately, the problem is that the module maps you're using have not been made
to work with C++, and they don't.

The point of [extern_c] is twofold: (1) it builds the target module in an
implicit extern "C" context (which affects its semantics in lots of ways), and
(2) it allows the module to be imported in an extern "C" context. You don't
want (2) without (1), because that can lead to silent and hard-to-diagnose
build breaks.

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