Re: preprocessor/10613: Please make -Wtrigraphs the default

[Neil Booth <neil at daikokuya dot co dot uk>]

The following reply was made to PR preprocessor/10613; it has been noted by GNATS.

From: Neil Booth <neil@daikokuya.co.uk>
To: Zack Weinberg <zack@codesourcery.com>
Cc: Hallvard B Furuseth <h.b.furuseth@usit.uio.no>, gcc-gnats@gcc.gnu.org,
	gcc-patches@gcc.gnu.org
Subject: Re: preprocessor/10613: Please make -Wtrigraphs the default
Date: Sun, 4 May 2003 22:33:20 +0100

 Zack Weinberg wrote:-
 
 > > This option is in effect unless trigraphs are turned on, and is
 > > implied by @option{-Wall}.  With the exception of a trigraph that
 > > would form an escaped newline, warnings are not given for trigraphs
 > > within comments as they do not affect the meaning of the program.
 > 
 > is confusing.  I would say instead
 > 
 >   Most trigraphs in comments cannot affect the meaning of the program.
 >   However, a trigraph that would form an escaped newline (@samp{??/}
 >   at the end of a line) can, by changing where the comment begins or
 >   ends.  Therefore, only trigraphs that would form escaped newlines
 >   produce warnings inside a comment.
 > 
 >   This option is implied by @option{-Wall}.  If @option{-Wall} is not
 >   given, this option is still enabled unless trigraphs are enabled.
 >   To get trigraph conversion without warnings, but get the other
 >   @option{-Wall} warnings, use @samp{-trigraphs -Wall -Wno-trigraphs}.
 
 That's great, thanks, I'll plagiarise in full.
 
 Neil.