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Working around unconformant offsetof in msvc

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Working around unconformant offsetof in msvc

pmard8
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I'm trying to feed visual studio headers to clang 4.0.0. It seems to work but I'm still getting these errors:

c:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.10.25017/include\xstring:1905:26: error: constexpr variable '_Memcpy_move_offset' must be initialized by a constant expression
        static constexpr size_t _Memcpy_move_offset = offsetof(_Mydata_t, _Bx);
                                ^                     ~~~~~~~~~~~~~~~~~~~~~~~~

Unfortunately this is C++ unconformant code (https://developercommunity.visualstudio.com/answers/23373/view.html), is there any way I can workaround this or have clang accept it anyway (perhaps -fms-compatibility should have included it?)
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