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Consider this program: #include <stdio.h> int main() { printf("%s\n", __FILE__); return 0; } Depending on the name of the file, this program works - or not. The issue I'm facing is that I'd like to print the name of the current file in an encoding-safe way. However, in case the file has funny characters which cannot be represented in the current code page, the compiler yields a warning (rightfully so): ?????????.c(3) : warning C4566: character represented by universal-character-name '\u043F' cannot be represented in the current code page (1252) How do I tackle this? I'd like to store the string given by __FILE__ in e.g. UTF-16 so that I can properly print it on any other system at runtime (by converting the stored UTF-16 representation to whatever the runtime system uses). To do so, I need to know: What encoding is used for the string given by __FILE__ ? It seems that, at least on Windows, the current system code page (in my case, Windows-1252) is used - but this is just guessing. Is this true? How can I store the UTF-8 (or UTF-16) representation of that string in my source code at build time? My real life use case: I have a macro which traces the current program execution, writing the current sourcecode/line number information to a file. It looks like this: struct LogFile { // Write message to file. The file should contain the UTF-8 encoded data! void writeMessage( const std::string &msg ); }; // Global function which returns a pointer to the 'active' log file. LogFile *activeLogFile(); #define TRACE_BEACON activeLogFile()->write( __FILE__ ); This breaks in case the current source file has a name which contains characters which cannot be represented by the current code page.

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