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* [Bug c++/13482] New: -Wall -W and -Wunused do not behave as documented
@ 2003-12-23 22:44 boris at kolpackov dot net
2003-12-24 18:30 ` [Bug c++/13482] " pinskia at gcc dot gnu dot org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: boris at kolpackov dot net @ 2003-12-23 22:44 UTC (permalink / raw)
To: gcc-bugs
$ cat >test.cpp
void bar ();
void foo (int const& a)
{
try
{
bar ();
}
catch (int const& e)
{
bar ();
}
}
$ g++ --version
g++ (GCC) 3.3 (Debian)
$ g++ -c ./test.cpp
$ g++ -Wunused -c ./test.cpp
$ # would expect two warnings here
$ g++ -Wall -c ./test.cpp
$ # would expect two warnings here
$ g++ -W -Wunused -c ./test.cpp
test.cpp: In function `void foo(const int&)':
test.cpp:4: warning: unused parameter `const int&a'
$ # doc never said I should use -W to make -Wunused work
$ # only one warning
$ # also note how ugly `const int&a' looks
$ g++ -W -Wall -c ./test.cpp
test.cpp: In function `void foo(const int&)':
test.cpp:4: warning: unused parameter `const int&a'
$ # again only one warning
--
Summary: -Wall -W and -Wunused do not behave as documented
Product: gcc
Version: 3.3.3
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: boris at kolpackov dot net
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i386-gnu-linux
GCC host triplet: i386-gnu-linux
GCC target triplet: i386-gnu-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13482
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/13482] -Wall -W and -Wunused do not behave as documented
2003-12-23 22:44 [Bug c++/13482] New: -Wall -W and -Wunused do not behave as documented boris at kolpackov dot net
@ 2003-12-24 18:30 ` pinskia at gcc dot gnu dot org
2003-12-24 18:30 ` pinskia at gcc dot gnu dot org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2003-12-24 18:30 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-12-24 18:16 -------
Confirmed.
For some reason -Wunused is not turning on -Wunused-parameter, if I use -Wunused-parameter,
GCC will warn about it.
Also exceptions variables are used always so GCC does not know that they are unused by the user.
This is not a regression.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Keywords| |diagnostic
Last reconfirmed|0000-00-00 00:00:00 |2003-12-24 18:16:57
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13482
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/13482] -Wall -W and -Wunused do not behave as documented
2003-12-23 22:44 [Bug c++/13482] New: -Wall -W and -Wunused do not behave as documented boris at kolpackov dot net
2003-12-24 18:30 ` [Bug c++/13482] " pinskia at gcc dot gnu dot org
@ 2003-12-24 18:30 ` pinskia at gcc dot gnu dot org
2003-12-24 21:12 ` pinskia at gcc dot gnu dot org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2003-12-24 18:30 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-12-24 18:17 -------
Also note that warning message has been fixed for the format on the mainline:
pr13482.cc:4: warning: unused parameter 'a'
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13482
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/13482] -Wall -W and -Wunused do not behave as documented
2003-12-23 22:44 [Bug c++/13482] New: -Wall -W and -Wunused do not behave as documented boris at kolpackov dot net
2003-12-24 18:30 ` [Bug c++/13482] " pinskia at gcc dot gnu dot org
2003-12-24 18:30 ` pinskia at gcc dot gnu dot org
@ 2003-12-24 21:12 ` pinskia at gcc dot gnu dot org
2003-12-24 21:13 ` pinskia at gcc dot gnu dot org
2003-12-24 21:38 ` boris at kolpackov dot net
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2003-12-24 21:12 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-12-24 21:05 -------
This is expected behavior so it is a documenation problem:
/* Unused function parameter warnings are reported when either
``-Wextra -Wunused'' or ``-Wunused-parameter'' is specified.
Thus, if -Wextra has already been seen, set warn_unused_parameter;
otherwise set maybe_warn_extra_parameter, which will be picked up
by set_Wextra. */
maybe_warn_unused_parameter = setting;
warn_unused_parameter = (setting && extra_warnings);
--
What |Removed |Added
----------------------------------------------------------------------------
Keywords|diagnostic |documentation
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13482
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/13482] -Wall -W and -Wunused do not behave as documented
2003-12-23 22:44 [Bug c++/13482] New: -Wall -W and -Wunused do not behave as documented boris at kolpackov dot net
` (2 preceding siblings ...)
2003-12-24 21:12 ` pinskia at gcc dot gnu dot org
@ 2003-12-24 21:13 ` pinskia at gcc dot gnu dot org
2003-12-24 21:38 ` boris at kolpackov dot net
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2003-12-24 21:13 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-12-24 21:09 -------
The documenation says:
In order to get a warning about an unused function parameter, you must
either specify @samp{-Wextra -Wunused} (note that @samp{-Wall} implies
@samp{-Wunused}), or separately specify @option{-Wunused-parameter}.
So it is right.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13482
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/13482] -Wall -W and -Wunused do not behave as documented
2003-12-23 22:44 [Bug c++/13482] New: -Wall -W and -Wunused do not behave as documented boris at kolpackov dot net
` (3 preceding siblings ...)
2003-12-24 21:13 ` pinskia at gcc dot gnu dot org
@ 2003-12-24 21:38 ` boris at kolpackov dot net
4 siblings, 0 replies; 6+ messages in thread
From: boris at kolpackov dot net @ 2003-12-24 21:38 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From boris at kolpackov dot net 2003-12-24 21:31 -------
Subject: Re: -Wall -W and -Wunused do not behave as documented
> Also exceptions variables are used always so GCC does not know that they
> are unused by the user.
This doesn't make sense to me. Can you elaborate a little bit?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13482
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2003-12-24 21:31 UTC | newest]
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2003-12-23 22:44 [Bug c++/13482] New: -Wall -W and -Wunused do not behave as documented boris at kolpackov dot net
2003-12-24 18:30 ` [Bug c++/13482] " pinskia at gcc dot gnu dot org
2003-12-24 18:30 ` pinskia at gcc dot gnu dot org
2003-12-24 21:12 ` pinskia at gcc dot gnu dot org
2003-12-24 21:13 ` pinskia at gcc dot gnu dot org
2003-12-24 21:38 ` boris at kolpackov dot net
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