http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53184

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I've just come across a case where an option to disable that warning would be
handy: We have a foo.cc file defining some classes in an anon namespace. A unit
test does #include "foo.cc" so it can test the implementation details, which
makes GCC (quite rightly) think it's a header file. In this case no other
translation unit is going to include the "header" and so there will be no ODR
violation, but we can't disable the warning so have to resort to macros to give
the namespace a name when used in this way, which means the test isn't testing
the real code.

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