warning: trigraph ... ignored - again

[John Marshall]

Zack Weinberg wrote:
> Trigraphs are still not enabled unless you put -trigraphs or -ansi on
> the command line.  The warning message
> 
> test.c:2:2: warning: trigraph ??/ ignored
> 
> was intended to make this obvious.  [...]
> Suggestions for better wording would be appreciated.

Motivated by grep 'warning.*suggest' in the gcc main directory, what about
something like

	warning: suggest rewriting ??/ to not look like a trigraph

    John