Ciro Santilli b47efd35fb Use defined for some preprocessor variables that might be undefined (#2476) ... The variables PYBIND11_HAS_OPTIONAL, PYBIND11_HAS_EXP_OPTIONAL, PYBIND11_HAS_VARIANT, __clang__, __APPLE__ were not checked for defined in a minortity of instances. If the project using pybind11 sets -Wundef, the warnings will show. The test build is also modified to catch the problem.		2020-09-10 13:58:26 -04:00
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pybind11	Use defined for some preprocessor variables that might be undefined (#2476)	2020-09-10 13:58:26 -04:00