compile-time-regular-expressions
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support stdlib without support for wchar_t
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On my embedded environment (https://github.com/ARM-software/LLVM-embedded-toolchain-for-Arm), there is no support for wchar_t. This PR adds preprocessor guards excluding code that refers to wide characters and strings. That guard is automatically applied when libc++ is detected and it indicates that itself has been compiled without support for wide characters.