Question

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

__LINE__ under GCC evaluates to an expression of type int;
__FILE__ evaluates to a char const[N] where N is the appropriate value.

• Does any major toolchain provide an equivalent to __FILE__ with type wchar const[N]?
• If so, what is it?

Answer 1

You can make your own WFILE:

#define WIDE2(x) L##x
#define WIDE1(x) WIDE2(x)
#define WFILE WIDE1(__FILE__)

Tested with non-ASCII characters and filename 马克.cpp:

#include <stdio.h>
#include <io.h>
#include <fcntl.h>

#define WIDE2(x) L##x
#define WIDE1(x) WIDE2(x)
#define WFILE WIDE1(__FILE__)

int main() {
    _setmode(_fileno(stdout), _O_U16TEXT); // required for Unicode output to console
    wprintf(L"%s\n", WFILE);
}

Demo (running from cmd.exe and Chinese language support installed):

C:\>cl /W4 /nologo 马克.cpp
马克.cpp

C:\>马克.exe
马克.cpp