Avoid warning in wrapper around printf

Question

I have an error reporting functionality in my little C library I\'m writing. I want to provide an errorf function in addition to the plain error fu

Answer 1

If you're using GCC or one of its relatives, try an attribute on the declaration:

void sio_errorf(const char *format, ...) __attribute__((format(printf, 1, 2)));

To add the attribute to a definition, you can use this:

__attribute__((format(printf, 1, 2)))
    static void sio_errorf(const char *format, ...) {
      ....