Predefined Macros for function name __func__

Question

I am attempting to build a debug log message function that records the file, line, and function of of where the log message was called from.

#define DEBUG_P         


        

Answer 1

I would like to add that the __FUNCTION__ macro is defined for both GCC and MSVC. Though non-standard, it is available on both compilers.

GCC Standard Predefined Macros quote:

C99 introduces __func__, and GCC has provided __FUNCTION__ for a long time. Both of these are strings containing the name of the current function (there are slight semantic differences; see the GCC manual). Neither of them is a macro; the preprocessor does not know the name of the current function. They tend to be useful in conjunction with __FILE__ and __LINE__, though.

MSVC Predefined Macros quote:

__FUNCTION__

Valid only in a function. Defines the undecorated name of the enclosing function as a string literal.

__FUNCTION__ is not expanded if you use the /EP or /P compiler option.

See __FUNCDNAME__ for an example.

So using __FUNCTION__ would be ok, since both compilers implement it. Though you may not get the same results on both compilers but that might be acceptable in some situations.