[issue20767] Some python extensions can't be compiled with clang 3.4

[koobs]

koobs added the comment:

Details on how clang 3.4 changes behaviour for compiler flags: 

http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html#new-compiler-flags

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<http://bugs.python.org/issue20767>
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