Can you GCC folks provide a macro to learn the code knows the name of input-charset, exec-charset and wide-exec-charset?

[unlvsur unlvsur via Gcc]

I desperately need to know exec-charset to do the correct codecvt.

Macros like __GNU_INPUT_CHARSET, __GNU_EXEC_CHARSET and __GNU_WIDE_EXEC_CHARSET 
would be great

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