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| author | Neil Booth <neil@daikokuya.co.uk> | 2003-05-04 21:45:08 +0000 |
|---|---|---|
| committer | Neil Booth <neil@gcc.gnu.org> | 2003-05-04 21:45:08 +0000 |
| commit | 1fecc2668c2982329d6bdf5cee24604043f0a1e0 (patch) | |
| tree | e48ce1ebe01be6799ef97562b1ff7846da8bf592 /gcc/doc | |
| parent | a8eb6044a9468a56cab63890820e17101ce8fd64 (diff) | |
| download | gcc-1fecc2668c2982329d6bdf5cee24604043f0a1e0.zip gcc-1fecc2668c2982329d6bdf5cee24604043f0a1e0.tar.gz gcc-1fecc2668c2982329d6bdf5cee24604043f0a1e0.tar.bz2 | |
* doc/cppopts.texi: Enhance -Wtrigraphs documentation
From-SVN: r66462
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/cppopts.texi | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi index 490905a..46f2226 100644 --- a/gcc/doc/cppopts.texi +++ b/gcc/doc/cppopts.texi @@ -87,12 +87,16 @@ comment, or whenever a backslash-newline appears in a @samp{//} comment. @item -Wtrigraphs @opindex Wtrigraphs @anchor{Wtrigraphs} -Warn if any trigraphs that may change the meaning of a program are -encountered. 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. +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}. @item -Wtraditional @opindex Wtraditional |