Coding convention: use of `!x' vs. `! x'

[Richard Kenner]

    However, I suggest that within GCC we use a consistent style going
    forward, and that the style be `!x' rather than `! x'.  This is no big
    deal, and it would be a waste of effort to change all uses of the
    latter into the former, but going forward let's use the former style.

What about the other unary operators?  Should they have a blank, like the
binary operators do, or no blank, like "!" now will?