How can we know the caller function's name?

Question

In the C language, __FUNCTION__ can be used to get the current function\'s name. But if I define a function named a() and it is called

Answer 1

You can do it with a gcc builtin.

void * __builtin_return_address(int level)

The following way should print the immediate caller of a function a().

Example:

a() {
    printf ("Caller name: %pS\n", __builtin_return_address(0));
}