This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
Re: preprocessor/7029: preprocessor should ignore #warning with -M
- From: Neil Booth <neil at daikokuya dot co dot uk>
- To: wolfgang dot bangerth at iwr dot uni-heidelberg dot de,Zack Weinberg <zack at codesourcery dot com>
- Cc: gcc-gnats at gcc dot gnu dot org, gcc-bugs at gcc dot gnu dot org
- Date: Mon, 1 Jul 2002 22:04:49 +0100
- Subject: Re: preprocessor/7029: preprocessor should ignore #warning with -M
- References: <20020614112002.30933.qmail@sources.redhat.com>
> IMHO, warnings generated by #warning may be omitted when not
> actually compiling code, for example when using -M to
> generate dependency lists. They seem inappropriate for this
> task.
> >How-To-Repeat:
> program> echo "#warning Warn about something" > x.cc
> program> gcc -M x.cc
> x.cc:1:2: warning: #warning Warn about something
> x.o: x.cc
Warnings are sent to stderr and the dpendency information isn't; so if
you don't want the warnings you are free to pipe stderr to /dev/null.
If you still wanted to retain errors but not warnings you can use -w,
or check the compiler return code.
So I disagree that there is any reason to change the existing behaviour,
and want to close this PR. Do you agree, Zack?
Neil.