Using __builtin_expect() in the body of unlikely branch

[Konstantin Kharlamov <hi-angel@xxxxxxxxx>]

In most projects a definite pattern that's unlikely to be executed is a 
PRINT_ERR macro which is basically a wrapper around fprintf() call. E.g.

	if (some_error) {
		PRINT_ERR("ERR");
		// do cleanup
		return;
	}

I wonder, is there a way to hint GCC that, whenever that code appears, 
whatever branch was prior to that is unlikely to be executed? E.g. can I 
add a `__builtin_expect(1, 0)` just before the fprintf, or is there 
anything alike?

I realize I have to use __builtin_expect() inside an `if(some_error)` 
condition, but it's not future-proof and clutters the code (the 
documentation for the built-in warns against its usage for a reason, I 
guess).