#pragma warnings are "invisible"

[Petter Reinholdtsen]

>Submitter-Id:  net
>Originator:Petter Reinholdtsen
>Organization:  Hungry Programmers
>Confidential:  no
>Synopsis:  #pragma warnings are "invisible"
>Severity:  serious
>Priority:  low
>Category:  
>Class: change-request
>Release:   3.0.2 20010825 (Debian prerelease) (Debian testing/unstable)
>Environment:
System: Linux zoot 2.4.6-686-smp #1 SMP Thu Jul 5 22:06:27 EST 2001 i686 
unknownArchitecture: i686
 

host: i386-pc-linux-gnu
build: i386-pc-linux-gnu
target: i386-pc-linux-gnu
configured with: ../src/configure -v 
--enable-languages=c,c++,java,f77,proto,objc --prefix=/usr 
--infodir=/share/info --mandir=/share/man --enable-shared --with-gnu-as 
--with-gnu-ld --with-system-zlib --enable-long-long --enable-nls 
--without-included-gettext --disable-checking --enable-threads=posix 
--enable-java-gc=boehm --with-cpp-install-dir=bin --enable-objc-gc i386-linux
>Description:

We are compiling the same program using GCC, Compaq C++, SUN
Forte and M$ Visual C++, and want to be able to insert
'warnings' into the code in a common way.  At the moment all
'common' code uses '#pragma WARNING("warning"), but these
messages are not displayed when using gcc.  The GCC extention
'#warning' is illegal on all the other compilers.  Would it be
possible to change gcc to display the content of an unknown
#pragma.  At the moment the following file (compiled with
-Wall)

#pragma WARNING "This is a pragma warning"
#pragma WARNING("This is a pragma warning ()")
#warning "This is a GNU C warning"

produces the following messages:

 pragmawarn.c:1: warning: ignoring #pragma WARNING
 pragmawarn.c:2: warning: ignoring #pragma WARNING
 pragmawarn.c:3:2: warning: #warning "This is a GNU C warning"

Could this be changed to display the content of the pragma,
for instance like this:

 pragmawarn.c:1: warning: ignoring #pragma WARNING "This is a 
pragma warning"
 pragmawarn.c:2: warning: ignoring #pragma WARNING("This is a 
pragma warning ()")
 pragmawarn.c:3:2: warning: #warning "This is a GNU C warning"

This would make GCC much more useful for our purpose.

The Compaq C++ handle the warnings like this, and it works
just fine for us. :-)

>How-To-Repeat:

>Fix:

Re: #pragma warnings are "invisible"

[Gordon Sadler]

You might take a look at -Wunknown-pragmas.
I use it for something similar with SCO <-> Linux.


>   Could this be changed to display the content of the pragma,
>   for instance like this:
> 
>pragmawarn.c:1: warning: ignoring #pragma WARNING "This is a 
> pragma warning"
>pragmawarn.c:2: warning: ignoring #pragma WARNING("This is a 
> pragma warning ()")
>pragmawarn.c:3:2: warning: #warning "This is a GNU C warning"
> 
>   This would make GCC much more useful for our purpose.
> 
>   The Compaq C++ handle the warnings like this, and it works
>   just fine for us. :-)

-- 
Gordon Sadler

Request For Information

[josh . winters]

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