Re: Does GCC have __gnuc_literal_encoding__ macro defined?

[Jonathan Wakely via Gcc]

GCC defines __GNUC_EXECUTION_CHARSET_NAME and
__GNUC_WIDE_EXECUTION_CHARSET_NAME instead.

https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html#Common-Predefined-Macros