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* doc/cppopts.texi: Enhance -Wtrigraphs documentation 

From-SVN: r66462
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Neil Booth 2003-05-04 21:45:08 +00:00 committed by Neil Booth
parent a8eb6044a9
commit 1fecc2668c
4 changed files with 30 additions and 12 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2003-05-04 Neil Booth <neil@daikokuya.co.uk>
* cppinit.c (cpp_create_reader, post_options): Warn about
trigraphs unless explicity set or -trigraphs.
* cpplex.c (warn_in_comment): New.
(_cpp_process_line_notes): Better handling of -Wtrigraphs.
(_cpp_skip_block_comment): Add call to _cpp_process_line_notes.
* doc/cppopts.texi, doc/cpp.texi: Update.
2003-05-04 Zdenek Dvorak <rakdver@atrey.karlin.mff.cuni.cz>
* Makefile.in (LIBGCOV): Add _gcov_merge_add.

16
gcc/doc/cppopts.texi
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@ -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

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2003-05-04 Neil Booth <neil@daikokuya.co.uk>
* gcc.dg/cpp/Wtrigraphs.c: Update.
* gcc.dg/cpp/Wtrigraphs-2.c: New tests.
2003-05-03 Geoffrey Keating <geoffk@apple.com>
* gcc.dg/ppc-fsel-1.c: New test.

12
gcc/testsuite/gcc.dg/cpp/Wtrigraphs-2.c
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@ -1,14 +1,14 @@
/* { dg-do preprocess } */
/* { dg-options "-std=c99 -Wtrigraphs -fno-show-column" } */
/* Test we don't double warn for trigraphs immediately after preceding
text. Source Neil Booth. 4 May 2003. */
/* Test warnings for trigraphs in comments, with trigraphs enabled.
Neil Booth. 4 May 2003. */
/* { dg-bogus "ignored" } Test ??< ??= a few ??/ random things in
/* { dg-bogus "converted" } Test ??< ??= a few ??/ random things in
{ dg-warning "converted" } some ??/
{ dg-bogus "ignored" } ??< comments. */
{ dg-bogus "converted" } ??< comments. */
// { dg-bogus "ignored" } More ??/ comment ??> tests.
// { dg-bogus "converted" } More ??/ comment ??> tests.
// { dg-warning "converted" } Another ??/
Test
@ -16,5 +16,5 @@
// { dg-warning "converted" } And another with space after ??/
the escape
// { dg-bogus "ignored" } A tricky one ??/\
// { dg-bogus "converted" } A tricky one ??/\