Jason Rhinelander ca0e82b79f Update PYBIND11_CPP1{4,7} macros for MSVC ... The PYBIND11_CPP14 macro started out as a guard for the compile-time path code in `descr.h`, but has since come to mean other things. This means that while the `descr.h` check has just checked the `PYBIND11_CPP14` macro, various other places now check `PYBIND11_CPP14 || _MSC_VER`. This reverses that by now setting the CPP14 macro when MSVC is trying to support C++14, but disabling the `descr.h` C++14 code (which still fails under MSVC 2017). The CPP17 macro also gets enabled when MSVC 2017 is compiling with /std:c++latest (the default is /std:c++14), which enables `std::optional` and `std::variant` support under MSVC.		2017-05-09 16:41:47 -04:00
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pybind11	Update PYBIND11_CPP1{4,7} macros for MSVC	2017-05-09 16:41:47 -04:00