js override console.log if not defined

Question

Which solution do you recommend, the second is simpler ( less code ), but there are drawbacks on using it ?

First: (Set a global debug flag)

Answer 1

EDIT: Andy's answer is way more elegant than the quick hack I've posted below.

I generally use this approach...

// prevent console errors on browsers without firebug
if (!window.console) {
    window.console = {};
    window.console.log = function(){};
}