* Re: feature request - unused arguments
@ 2002-07-23 6:28 Robert Dewar
2002-07-23 7:20 ` Momchil Velikov
0 siblings, 1 reply; 6+ messages in thread
From: Robert Dewar @ 2002-07-23 6:28 UTC (permalink / raw)
To: Steven_Shaw, gcc
<<Please can someone add a warning for unused arguments in C and C++. It would be
much appreciated.
>>
We have this feature in Ada (GNAT) and we definitely find it useful. However
we also found it important to add
pragma Unreferenced (entity);
that would note that an entity (most often an argument) is deliberately
unreferenced.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: feature request - unused arguments
2002-07-23 6:28 feature request - unused arguments Robert Dewar
@ 2002-07-23 7:20 ` Momchil Velikov
0 siblings, 0 replies; 6+ messages in thread
From: Momchil Velikov @ 2002-07-23 7:20 UTC (permalink / raw)
To: Robert Dewar; +Cc: Steven_Shaw, gcc
>>>>> "Robert" == Robert Dewar <dewar@gnat.com> writes:
Robert> <<Please can someone add a warning for unused arguments in C and C++. It would be
Robert> much appreciated.
>>>
Robert> We have this feature in Ada (GNAT) and we definitely find it useful. However
Robert> we also found it important to add
Robert> pragma Unreferenced (entity);
Robert> that would note that an entity (most often an argument) is deliberately
Robert> unreferenced.
$ cat > x.c
int foo (int x, int y) { return x; }
$ gcc -c -W -Wunused x.c
x.c: In function `foo':
x.c:1: warning: unused parameter `y'
$ gcc --version
2.95.4
$
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: feature request - unused arguments
2002-07-24 1:05 Steven_Shaw
@ 2002-07-24 1:42 ` Joe Buck
0 siblings, 0 replies; 6+ messages in thread
From: Joe Buck @ 2002-07-24 1:42 UTC (permalink / raw)
To: Steven_Shaw; +Cc: velco, gcc
[ warnings for unused parameters ]
> I did find a case where it doesn't work:
>
> $ cat foo.cc
> struct foo1 {
> int plus(int a, int b) {
> return a + a;
> }
> };
> $ g++ -W -Wall -c foo.cc
> $
Yes, some checks on inline functions aren't performed unless the function
is called.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: feature request - unused arguments
@ 2002-07-24 1:05 Steven_Shaw
2002-07-24 1:42 ` Joe Buck
0 siblings, 1 reply; 6+ messages in thread
From: Steven_Shaw @ 2002-07-24 1:05 UTC (permalink / raw)
To: velco; +Cc: gcc
>>>>>> "Robert" == Robert Dewar <dewar@gnat.com> writes:
>
>Robert> <<Please can someone add a warning for unused arguments in C and C++.
It would be
>Robert> much appreciated.
>>>>
>
>Robert> We have this feature in Ada (GNAT) and we definitely find it useful.
However
>Robert> we also found it important to add
>
>Robert> pragma Unreferenced (entity);
>
>Robert> that would note that an entity (most often an argument) is deliberately
>Robert> unreferenced.
>
>$ cat > x.c
>int foo (int x, int y) { return x; }
>$ gcc -c -W -Wunused x.c
>x.c: In function `foo':
>x.c:1: warning: unused parameter `y'
>$ gcc --version
>2.95.4
>$
Ah. Thanks. It's not clear that -W is need in addition to -Wall. The doco for
-Wall
states "All of the above -W options combined" which includes -Wunused-parameter.
I did find a case where it doesn't work:
$ cat foo.cc
struct foo1 {
int plus(int a, int b) {
return a + a;
}
};
$ g++ -W -Wall -c foo.cc
$
Cheers, Steve.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: feature request - unused arguments
2002-07-23 5:18 Steven_Shaw
@ 2002-07-23 6:04 ` Gerald Pfeifer
0 siblings, 0 replies; 6+ messages in thread
From: Gerald Pfeifer @ 2002-07-23 6:04 UTC (permalink / raw)
To: Steven_Shaw; +Cc: gcc
On Tue, 23 Jul 2002 Steven_Shaw@adc.com wrote:
> Please can someone add a warning for unused arguments in C and C++. It
> would be much appreciated.
It's already there. Please read the docs, for example at
http://gcc.gnu.org/onlinedocs/gcc-3.1/gcc/Warning-Options.html#Warning%20Options
and search for "unused".
Gerald
--
Gerald "Jerry" pfeifer@dbai.tuwien.ac.at http://www.dbai.tuwien.ac.at/~pfeifer/
^ permalink raw reply [flat|nested] 6+ messages in thread
* feature request - unused arguments
@ 2002-07-23 5:18 Steven_Shaw
2002-07-23 6:04 ` Gerald Pfeifer
0 siblings, 1 reply; 6+ messages in thread
From: Steven_Shaw @ 2002-07-23 5:18 UTC (permalink / raw)
To: gcc
Please can someone add a warning for unused arguments in C and C++. It would be
much appreciated.
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^ permalink raw reply [flat|nested] 6+ messages in thread
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2002-07-23 6:28 feature request - unused arguments Robert Dewar
2002-07-23 7:20 ` Momchil Velikov
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2002-07-24 1:05 Steven_Shaw
2002-07-24 1:42 ` Joe Buck
2002-07-23 5:18 Steven_Shaw
2002-07-23 6:04 ` Gerald Pfeifer
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