Does spdlog support utf-8 encoding in Linux?

[RonnieHu]

I want to write the log file in form of utf-8 encoding.
And I hava tried the "SPDLOG_WCHAR_TO_UTF8_SUPPORT" macro, which returns the error of "#error SPDLOG_WCHAR_TO_UTF8_SUPPORT only supported on windows"
So is there some way to support the utf-8 encoding style in spdlog?
Thanks

[tt4g]

Short answer: spdlog does not support char * character encoding conversion.

Long answer: In the C/C++ language, there is no character encoding specification for char *. The lack of specification means that it is compiler and platform (OS) dependent.
Since there is no language specification, there is no way to know spdlog the character encoding of the data assigned to char *.

However, most Linux OS treat char * in source code as UTF-8 encoding.
More strictly, the GCC compiler uses the exec-charset option to determine the character encoding of char * in the source code (https://gcc.gnu.org/onlinedocs/cpp/Invocation.html).
It is safe to assume that the character encoding used by the compiler and platform is UTF-8 from the beginning.

NOTE: actual applications read external files and exchange data via HTTP request/response.
The encoding of these strings must be converted to the character encoding in the application for which the developer is responsible.

[tt4g]

See also: https://stackoverflow.com/questions/148403/utf8-to-from-wide-char-conversion-in-stl

[tikabass]

As of c++23, there will be native UTF-8 support in c++. Are there any plans to support c++23's char8_t ?

[tt4g]

The char8_t type is just to make it easy to tell that a UTF-8 string is being stored. There is no magic that will convert the encoding of the assigned character to UTF-8.
The data size is the same as char, so it can be safely cast with static_cast<char *>(char8_t *).

Reference: https://en.cppreference.com/w/cpp/language/types#char8_t