Is there widely-available wide-character variant of `__FILE__`?

Question

One may generally use __LINE__ and __FILE__ in C++ programs, with many toolchains, including GCC.

__LINE__ under GCC evaluates

Answer 1

I would have put this answer as a comment to an earlier reply but was not allowed due to not having the minimum 50 reputation to comment...

In Visual Studio, _T(__FILE__) will NOT expand to L__FILE__ unless you modify its standard definition of _T in the tchar.h header file. _T(__FILE__) and _T(__FUNCTION__) worked 5 years ago and still work today if you are looking for wide versions of the current file and function.

_T(x) is defined as __T(x), which is defined as L##x when _UNICODE is defined and x otherwise. So _T(__FILE__) expands to something like __T("my_file.c"), which then expands to L"my_file.c" or "my_file.c" depending on _UNICODE. It is useful to test things before claiming that they do not work.