Should one never use static inline function?

Question

There are two implications of using the inline keyword(§ 7.1.3/4):

1. It hints the compiler that substitution of function body at the point

Answer 1

I just read a man page for gcc and it specifically states the use of static inline with a compiler flag. In the case of the flag, it inlines the function and if it is also static and is inlined in every instance that it is called, then it gets rid of the function definition which will never be used in the created object file, thereby reducing the size of the generated code by that little bit.