* [Bug c++/24983] Needs a warning?
2005-11-22 2:31 [Bug c++/24983] New: Needs a warning? igodard at pacbell dot net
@ 2005-11-22 2:46 ` gdr at integrable-solutions dot net
2005-11-22 3:01 ` pinskia at gcc dot gnu dot org
` (5 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: gdr at integrable-solutions dot net @ 2005-11-22 2:46 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from gdr at integrable-solutions dot net 2005-11-22 02:46 -------
Subject: Re: New: Needs a warning?
"igodard at pacbell dot net" <gcc-bugzilla@gcc.gnu.org> writes:
| struct foo { const void f(); };
| void foo::f(){}
|
| gets you:
|
| ~/ootbc/members/src$ g++ foo.cc -Wall
| foo.cc:2: error: prototype for `void foo::f()' does not match any in class
| `foo'
| foo.cc:1: error: candidate is: const void foo::f()
| foo.cc:2: error: `void foo::f()' and `const void foo::f()' cannot be
overloaded
Awful. Please assign it to me.
-- Gaby
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24983
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c++/24983] Needs a warning?
2005-11-22 2:31 [Bug c++/24983] New: Needs a warning? igodard at pacbell dot net
2005-11-22 2:46 ` [Bug c++/24983] " gdr at integrable-solutions dot net
@ 2005-11-22 3:01 ` pinskia at gcc dot gnu dot org
2005-11-22 3:58 ` Gabriel Dos Reis
2005-11-22 3:45 ` igodard at pacbell dot net
` (4 subsequent siblings)
6 siblings, 1 reply; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-11-22 3:01 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from pinskia at gcc dot gnu dot org 2005-11-22 03:01 -------
Different versions give different diagnostics:
earth:~>gcc t.cc
t.cc:2: error: prototype for 'void foo::f()' does not match any in class 'foo'
t.cc:1: error: candidate is: const void foo::f()
t.cc:2: error: 'void foo::f()' cannot be overloaded
t.cc:1: error: with 'const void foo::f()'
earth:~>~/ia32_linux_gcc3_4/bin/gcc t.cc
t.cc:2: error: prototype for `void foo::f()' does not match any in class `foo'
t.cc:1: error: candidate is: const void foo::f()
t.cc:2: error: `void foo::f()' and `const void foo::f()' cannot be overloaded
earth:~>~/ia32_linux_gcc3_3/bin/gcc t.cc
t.cc:2: error: prototype for `void foo::f()' does not match any in class `foo'
t.cc:1: error: candidate is: const void foo::f()
t.cc:2: error: `void foo::f()' and `const void foo::f()' cannot be overloaded
earth:~>~/ia32_linux_gcc3_2/bin/gcc t.cc
t.cc:2: prototype for `void foo::f()' does not match any in class `foo'
t.cc:1: candidate is: const void foo::f()
t.cc:2: `void foo::f()' and `const void foo::f()' cannot be overloaded
earth:~>~/ia32_linux_gcc3_0/bin/gcc t.cc
t.cc:2: prototype for `void foo::f()' does not match any in class `foo'
t.cc:1: candidate is: const void foo::f()
earth:~>~/ia32_linux_gcc2_95//bin/gcc t.cc
t.cc:2: new declaration `void foo::f()'
t.cc:1: ambiguates old declaration `const void foo::f()'
I say that 3.0.x is the best if it is what we should say then we have a
regression.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24983
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: [Bug c++/24983] Needs a warning?
2005-11-22 3:01 ` pinskia at gcc dot gnu dot org
@ 2005-11-22 3:58 ` Gabriel Dos Reis
0 siblings, 0 replies; 9+ messages in thread
From: Gabriel Dos Reis @ 2005-11-22 3:58 UTC (permalink / raw)
To: gcc-bugzilla; +Cc: gcc-bugs
"pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> writes:
| earth:~>~/ia32_linux_gcc3_0/bin/gcc t.cc
| t.cc:2: prototype for `void foo::f()' does not match any in class `foo'
| t.cc:1: candidate is: const void foo::f()
| earth:~>~/ia32_linux_gcc2_95//bin/gcc t.cc
| t.cc:2: new declaration `void foo::f()'
| t.cc:1: ambiguates old declaration `const void foo::f()'
|
|
| I say that 3.0.x is the best if it is what we should say then we have a
| regression.
We should say: 'const void' is not a valid type
and be done with it.
-- Gaby
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/24983] Needs a warning?
2005-11-22 2:31 [Bug c++/24983] New: Needs a warning? igodard at pacbell dot net
2005-11-22 2:46 ` [Bug c++/24983] " gdr at integrable-solutions dot net
2005-11-22 3:01 ` pinskia at gcc dot gnu dot org
@ 2005-11-22 3:45 ` igodard at pacbell dot net
2005-11-22 3:58 ` gdr at integrable-solutions dot net
` (3 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: igodard at pacbell dot net @ 2005-11-22 3:45 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from igodard at pacbell dot net 2005-11-22 03:45 -------
The 3.0 is the best error, but I like the warning that comeau also gives:
Comeau C/C++ 4.3.3 (Aug 6 2003 15:13:37) for ONLINE_EVALUATION_BETA1
Copyright 1988-2003 Comeau Computing. All rights reserved.
MODE:strict errors C++
"ComeauTest.c", line 1: warning: type qualifier on return type is meaningless
struct foo { const void f(); };
^
"ComeauTest.c", line 2: error: declaration is incompatible with
"const void foo::f()" (declared at line 1)
void foo::f(){}
^
1 error detected in the compilation of "ComeauTest.c".
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24983
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c++/24983] Needs a warning?
2005-11-22 2:31 [Bug c++/24983] New: Needs a warning? igodard at pacbell dot net
` (2 preceding siblings ...)
2005-11-22 3:45 ` igodard at pacbell dot net
@ 2005-11-22 3:58 ` gdr at integrable-solutions dot net
2005-11-22 4:05 ` igodard at pacbell dot net
` (2 subsequent siblings)
6 siblings, 0 replies; 9+ messages in thread
From: gdr at integrable-solutions dot net @ 2005-11-22 3:58 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from gdr at integrable-solutions dot net 2005-11-22 03:58 -------
Subject: Re: Needs a warning?
"pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> writes:
| earth:~>~/ia32_linux_gcc3_0/bin/gcc t.cc
| t.cc:2: prototype for `void foo::f()' does not match any in class `foo'
| t.cc:1: candidate is: const void foo::f()
| earth:~>~/ia32_linux_gcc2_95//bin/gcc t.cc
| t.cc:2: new declaration `void foo::f()'
| t.cc:1: ambiguates old declaration `const void foo::f()'
|
|
| I say that 3.0.x is the best if it is what we should say then we have a
| regression.
We should say: 'const void' is not a valid type
and be done with it.
-- Gaby
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24983
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c++/24983] Needs a warning?
2005-11-22 2:31 [Bug c++/24983] New: Needs a warning? igodard at pacbell dot net
` (3 preceding siblings ...)
2005-11-22 3:58 ` gdr at integrable-solutions dot net
@ 2005-11-22 4:05 ` igodard at pacbell dot net
2005-11-23 5:25 ` bangerth at dealii dot org
2008-03-30 20:45 ` pinskia at gcc dot gnu dot org
6 siblings, 0 replies; 9+ messages in thread
From: igodard at pacbell dot net @ 2005-11-22 4:05 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from igodard at pacbell dot net 2005-11-22 04:05 -------
On the contrary, "const void" is a valid type, because the difference between
"const void*" and "void*" preserved the typeless constness, which can be
important in disambiguating templates. So if "const void" is valid as a pointer
target, it is also (syntactically) valid as a function return type. It's just
not meaningful, so EDG gives a warning.
Note that the gcc diagnostic is the same if the return type is int/const int,
so it's nothing to do with "void".
Ivan
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24983
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c++/24983] Needs a warning?
2005-11-22 2:31 [Bug c++/24983] New: Needs a warning? igodard at pacbell dot net
` (4 preceding siblings ...)
2005-11-22 4:05 ` igodard at pacbell dot net
@ 2005-11-23 5:25 ` bangerth at dealii dot org
2008-03-30 20:45 ` pinskia at gcc dot gnu dot org
6 siblings, 0 replies; 9+ messages in thread
From: bangerth at dealii dot org @ 2005-11-23 5:25 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from bangerth at dealii dot org 2005-11-23 05:25 -------
Given the literal meaning of the word "void", it is amusing to think
about what one might want to mean when one says "const void"...
--
bangerth at dealii dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2005-11-23 05:25:17
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24983
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug c++/24983] Needs a warning?
2005-11-22 2:31 [Bug c++/24983] New: Needs a warning? igodard at pacbell dot net
` (5 preceding siblings ...)
2005-11-23 5:25 ` bangerth at dealii dot org
@ 2008-03-30 20:45 ` pinskia at gcc dot gnu dot org
6 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2008-03-30 20:45 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from pinskia at gcc dot gnu dot org 2008-03-30 20:45 -------
With -Wextra (aka -W), we get a warning now:
t.cc:1: warning: type qualifiers ignored on function return type
So closing as fixed.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.3.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24983
^ permalink raw reply [flat|nested] 9+ messages in thread