Function Names as Strings
6.47 Function Names as Strings
GCC provides three magic variables that hold the name of the current function, as a string. The first of these is __func__, which is part of the C99 standard:
The identifier __func__ is implicitly declared by the translator as if, immediately following the opening brace of each function definition, the declaration
static const char __func__[] = "function-name";
appeared, where function-name is the name of the lexically-enclosing function. This name is the unadorned name of the function.
__FUNCTION__ is another name for __func__. Older versions of GCC recognize only this name. However, it is not standardized. For maximum portability, we recommend you use __func__, but provide a fallback definition with the preprocessor:
#if __STDC_VERSION__ &