Warning for trigraphs in comment?

[Paul Koning]

>>>>> "Gabriel" == Gabriel Dos Reis <gdr@integrable-solutions.net> writes:
 >> The patch is not appropriate for 3.3.  
 >> The real fix is to remove trigraphs from the standard.

 Gabriel> Oh, I'm all for removing trigraphs, digraphs, quadrigraphs
 Gabriel> and whatevergraphs -- I've also thought they were mistakes.
 Gabriel> But, in fact, I'm skeptical that would ever happen.

I like the notion too.  Trigraphs are an utter misfeature.  

Would it make sense to have the lexer ignore trigraphs (i.e., just
treat ??/ as three characters) unless specifically enabled with
-fenable-trigraphs?   In the unlikely case that anyone actually uses
trigraphs, this would enable them to continue doing so.

   paul