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This quashes -Wundef warnings in ansidecl.h when compiled in C or C++. In C, __cpp_constexpr and __cplusplus aren't defined so we evaluate them to 0; conversely, __STDC_VERSION__ is not defined in C++. This has caused grief when -Wundef is used with -Werror. I've also tested -traditional-cpp. include/ChangeLog: * ansidecl.h: Check if __cplusplus is defined before checking the value of __cpp_constexpr and __cplusplus. Don't check __STDC_VERSION__ in C++.
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