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* [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor
@ 2010-01-22 11:27 mathieu dot malaterre at gmail dot com
2010-01-22 11:57 ` [Bug c++/42844] " redi at gcc dot gnu dot org
` (12 more replies)
0 siblings, 13 replies; 18+ messages in thread
From: mathieu dot malaterre at gmail dot com @ 2010-01-22 11:27 UTC (permalink / raw)
To: gcc-bugs
I believe the following c++ code is incorrect:
struct A
{
A(){}
};
struct B : public A
{
};
int main()
{
const B b;
return 0;
}
It fails with Comeau with the following error:
"ComeauTest.c", line 13: error: const variable "b" requires an initializer --
class
"B" has no explicitly declared default constructor
const B b;
--
Summary: const variable requires initializer / no explicitly
declared default constructor
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: mathieu dot malaterre at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
@ 2010-01-22 11:57 ` redi at gcc dot gnu dot org
2010-01-22 12:27 ` redi at gcc dot gnu dot org
` (11 subsequent siblings)
12 siblings, 0 replies; 18+ messages in thread
From: redi at gcc dot gnu dot org @ 2010-01-22 11:57 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from redi at gcc dot gnu dot org 2010-01-22 11:57 -------
Confirmed, not a regression.
[dcl.init]/9:
If no initializer is specified for an object, and the object is of (possibly
cv-qualified) non-POD class type (or array thereof), the object shall be
default-initialized; if the object is of const-qualified type, the underlying
class type shall have a user-declared default constructor.
--
redi at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Keywords| |accepts-invalid
Known to fail| |4.1.2 4.4.2
Last reconfirmed|0000-00-00 00:00:00 |2010-01-22 11:57:37
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
2010-01-22 11:57 ` [Bug c++/42844] " redi at gcc dot gnu dot org
@ 2010-01-22 12:27 ` redi at gcc dot gnu dot org
2010-01-22 15:56 ` pinskia at gcc dot gnu dot org
` (10 subsequent siblings)
12 siblings, 0 replies; 18+ messages in thread
From: redi at gcc dot gnu dot org @ 2010-01-22 12:27 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from redi at gcc dot gnu dot org 2010-01-22 12:27 -------
N.B. the wording has moved in C++0x but the requirement is similar:
6 ... If a program calls for the default initialization of an object of a
const-qualified type T, T shall be a class type with a user-provided default
constructor.
11 If no initializer is specified for an object, the object is
default-initialized;
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
2010-01-22 11:57 ` [Bug c++/42844] " redi at gcc dot gnu dot org
2010-01-22 12:27 ` redi at gcc dot gnu dot org
@ 2010-01-22 15:56 ` pinskia at gcc dot gnu dot org
2010-01-22 15:57 ` pinskia at gcc dot gnu dot org
` (9 subsequent siblings)
12 siblings, 0 replies; 18+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2010-01-22 15:56 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from pinskia at gcc dot gnu dot org 2010-01-22 15:56 -------
Related to PR 25811.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
` (2 preceding siblings ...)
2010-01-22 15:56 ` pinskia at gcc dot gnu dot org
@ 2010-01-22 15:57 ` pinskia at gcc dot gnu dot org
2010-03-30 11:40 ` fabien dot chene at gmail dot com
` (8 subsequent siblings)
12 siblings, 0 replies; 18+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2010-01-22 15:57 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from pinskia at gcc dot gnu dot org 2010-01-22 15:56 -------
And PR 29043.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
` (3 preceding siblings ...)
2010-01-22 15:57 ` pinskia at gcc dot gnu dot org
@ 2010-03-30 11:40 ` fabien dot chene at gmail dot com
2010-03-30 11:44 ` dodji at redhat dot com
` (7 subsequent siblings)
12 siblings, 0 replies; 18+ messages in thread
From: fabien dot chene at gmail dot com @ 2010-03-30 11:40 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from fabien dot chene at gmail dot com 2010-03-30 11:40 -------
I'm working on this bug
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
` (4 preceding siblings ...)
2010-03-30 11:40 ` fabien dot chene at gmail dot com
@ 2010-03-30 11:44 ` dodji at redhat dot com
2010-03-30 11:51 ` fabien dot chene at gmail dot com
` (6 subsequent siblings)
12 siblings, 0 replies; 18+ messages in thread
From: dodji at redhat dot com @ 2010-03-30 11:44 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from dodji at gcc dot gnu dot org 2010-03-30 11:44 -------
Subject: Re: const variable requires initializer / no
explicitly declared default constructor
> I'm working on this bug
Could you please assign it to yourself then?
Thanks.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
` (5 preceding siblings ...)
2010-03-30 11:44 ` dodji at redhat dot com
@ 2010-03-30 11:51 ` fabien dot chene at gmail dot com
2010-03-30 11:56 ` redi at gcc dot gnu dot org
` (5 subsequent siblings)
12 siblings, 0 replies; 18+ messages in thread
From: fabien dot chene at gmail dot com @ 2010-03-30 11:51 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from fabien dot chene at gmail dot com 2010-03-30 11:51 -------
(In reply to comment #6)
> Subject: Re: const variable requires initializer / no
> explicitly declared default constructor
>
> > I'm working on this bug
>
> Could you please assign it to yourself then?
> Thanks.
I would be glad to know how to do that :-)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
` (6 preceding siblings ...)
2010-03-30 11:51 ` fabien dot chene at gmail dot com
@ 2010-03-30 11:56 ` redi at gcc dot gnu dot org
2010-03-30 14:11 ` fabien dot chene at gmail dot com
` (4 subsequent siblings)
12 siblings, 0 replies; 18+ messages in thread
From: redi at gcc dot gnu dot org @ 2010-03-30 11:56 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from redi at gcc dot gnu dot org 2010-03-30 11:56 -------
you should have the option "Accept bug" below the comment box. I've done it
for you
--
redi at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |fabien dot chene at gmail
|dot org |dot com
Status|NEW |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
` (7 preceding siblings ...)
2010-03-30 11:56 ` redi at gcc dot gnu dot org
@ 2010-03-30 14:11 ` fabien dot chene at gmail dot com
2010-03-30 16:47 ` fabien dot chene at gmail dot com
` (3 subsequent siblings)
12 siblings, 0 replies; 18+ messages in thread
From: fabien dot chene at gmail dot com @ 2010-03-30 14:11 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from fabien dot chene at gmail dot com 2010-03-30 14:11 -------
(In reply to comment #8)
> you should have the option "Accept bug" below the comment box.
> I've done it for you
I've just seen it since you did it for me (thanks), but I still can't do it by
myself for other bugs :-(
reduced testcase for this one:
struct A {};
void f()
{
A const a;
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
` (8 preceding siblings ...)
2010-03-30 14:11 ` fabien dot chene at gmail dot com
@ 2010-03-30 16:47 ` fabien dot chene at gmail dot com
2010-04-12 20:45 ` fabien dot chene at gmail dot com
` (2 subsequent siblings)
12 siblings, 0 replies; 18+ messages in thread
From: fabien dot chene at gmail dot com @ 2010-03-30 16:47 UTC (permalink / raw)
To: gcc-bugs
------- Comment #10 from fabien dot chene at gmail dot com 2010-03-30 16:47 -------
> reduced testcase for this one:
>
> struct A {};
>
> void f()
> {
> A const a;
> }
I misspoke, let's keep the original testcase.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
` (9 preceding siblings ...)
2010-03-30 16:47 ` fabien dot chene at gmail dot com
@ 2010-04-12 20:45 ` fabien dot chene at gmail dot com
2010-04-20 22:49 ` fabien dot chene at gmail dot com
2010-04-27 18:56 ` jason at gcc dot gnu dot org
12 siblings, 0 replies; 18+ messages in thread
From: fabien dot chene at gmail dot com @ 2010-04-12 20:45 UTC (permalink / raw)
To: gcc-bugs
------- Comment #11 from fabien dot chene at gmail dot com 2010-04-12 20:45 -------
Patch here:
http://gcc.gnu.org/ml/gcc-patches/2010-04/msg00604.html
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
` (10 preceding siblings ...)
2010-04-12 20:45 ` fabien dot chene at gmail dot com
@ 2010-04-20 22:49 ` fabien dot chene at gmail dot com
2010-04-27 18:56 ` jason at gcc dot gnu dot org
12 siblings, 0 replies; 18+ messages in thread
From: fabien dot chene at gmail dot com @ 2010-04-20 22:49 UTC (permalink / raw)
To: gcc-bugs
------- Comment #12 from fabien dot chene at gmail dot com 2010-04-20 22:49 -------
updated patch here:
http://gcc.gnu.org/ml/gcc-patches/2010-04/msg01148.html
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
` (11 preceding siblings ...)
2010-04-20 22:49 ` fabien dot chene at gmail dot com
@ 2010-04-27 18:56 ` jason at gcc dot gnu dot org
12 siblings, 0 replies; 18+ messages in thread
From: jason at gcc dot gnu dot org @ 2010-04-27 18:56 UTC (permalink / raw)
To: gcc-bugs
------- Comment #13 from jason at gcc dot gnu dot org 2010-04-27 18:56 -------
Subject: Bug 42844
Author: jason
Date: Tue Apr 27 18:56:13 2010
New Revision: 158797
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=158797
Log:
PR c++/42844
* decl.c (check_for_uninitialized_const_var): Handle classes that need
constructing, too.
(check_initializer): Call it for classes that need constructing, too.
* class.c (in_class_defaulted_default_constructor): New.
* cp-tree.h: Declare it.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/pr42844-2.C
trunk/gcc/testsuite/g++.dg/init/pr42844.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/class.c
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/decl.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/cpp0x/defaulted2.C
trunk/gcc/testsuite/g++.dg/tree-ssa/pr27549.C
trunk/gcc/testsuite/g++.old-deja/g++.mike/dyncast8.C
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/src/future.cc
trunk/libstdc++-v3/src/system_error.cc
trunk/libstdc++-v3/testsuite/util/testsuite_error.h
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
[not found] <bug-42844-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2011-09-25 20:37 ` jason at gcc dot gnu.org
@ 2014-02-20 8:44 ` potswa at mac dot com
3 siblings, 0 replies; 18+ messages in thread
From: potswa at mac dot com @ 2014-02-20 8:44 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
David Krauss <potswa at mac dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |potswa at mac dot com
--- Comment #17 from David Krauss <potswa at mac dot com> ---
The changelog should refer to CWG DR 253, not 234.
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
[not found] <bug-42844-4@http.gcc.gnu.org/bugzilla/>
2010-11-12 15:37 ` fabien.chene at gmail dot com
2011-09-23 21:36 ` jason at gcc dot gnu.org
@ 2011-09-25 20:37 ` jason at gcc dot gnu.org
2014-02-20 8:44 ` potswa at mac dot com
3 siblings, 0 replies; 18+ messages in thread
From: jason at gcc dot gnu.org @ 2011-09-25 20:37 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
--- Comment #16 from Jason Merrill <jason at gcc dot gnu.org> 2011-09-25 20:29:09 UTC ---
Author: jason
Date: Sun Sep 25 20:29:04 2011
New Revision: 179170
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=179170
Log:
Core 234 - allow const objects with no initializer or
user-provided default constructor if the defaulted constructor
initializes all the subobjects.
PR c++/20039
PR c++/42844
* class.c (default_init_uninitialized_part): New.
* cp-tree.h: Declare it.
* decl.c (check_for_uninitialized_const_var): Use it.
* init.c (perform_member_init): Likewise.
(build_new_1): Likewise.
* method.c (walk_field_subobs): Likewise.
Added:
branches/gcc-4_6-branch/gcc/testsuite/g++.dg/init/const8.C
Modified:
branches/gcc-4_6-branch/gcc/cp/ChangeLog
branches/gcc-4_6-branch/gcc/cp/class.c
branches/gcc-4_6-branch/gcc/cp/cp-tree.h
branches/gcc-4_6-branch/gcc/cp/decl.c
branches/gcc-4_6-branch/gcc/cp/init.c
branches/gcc-4_6-branch/gcc/cp/method.c
branches/gcc-4_6-branch/gcc/testsuite/ChangeLog
branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/constexpr-object1.C
branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/defaulted2.C
branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/pr42844-2.C
branches/gcc-4_6-branch/gcc/testsuite/g++.dg/init/pr42844.C
branches/gcc-4_6-branch/gcc/testsuite/lib/prune.exp
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
[not found] <bug-42844-4@http.gcc.gnu.org/bugzilla/>
2010-11-12 15:37 ` fabien.chene at gmail dot com
@ 2011-09-23 21:36 ` jason at gcc dot gnu.org
2011-09-25 20:37 ` jason at gcc dot gnu.org
2014-02-20 8:44 ` potswa at mac dot com
3 siblings, 0 replies; 18+ messages in thread
From: jason at gcc dot gnu.org @ 2011-09-23 21:36 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
--- Comment #15 from Jason Merrill <jason at gcc dot gnu.org> 2011-09-23 21:30:52 UTC ---
Author: jason
Date: Fri Sep 23 21:30:48 2011
New Revision: 179130
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=179130
Log:
Core 234 - allow const objects with no initializer or
user-provided default constructor if the defaulted constructor
initializes all the subobjects.
PR c++/20039
PR c++/42844
* class.c (default_init_uninitialized_part): New.
* cp-tree.h: Declare it.
* decl.c (check_for_uninitialized_const_var): Use it.
* init.c (perform_member_init): Likewise.
(build_new_1): Likewise.
* method.c (walk_field_subobs): Likewise.
Added:
trunk/gcc/testsuite/g++.dg/init/const8.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/class.c
trunk/gcc/cp/cp-tree.h
trunk/gcc/cp/decl.c
trunk/gcc/cp/init.c
trunk/gcc/cp/method.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-object1.C
trunk/gcc/testsuite/g++.dg/cpp0x/defaulted2.C
trunk/gcc/testsuite/g++.dg/cpp0x/pr42844-2.C
trunk/gcc/testsuite/g++.dg/init/pr20039.C
trunk/gcc/testsuite/g++.dg/init/pr42844.C
^ permalink raw reply [flat|nested] 18+ messages in thread
* [Bug c++/42844] const variable requires initializer / no explicitly declared default constructor
[not found] <bug-42844-4@http.gcc.gnu.org/bugzilla/>
@ 2010-11-12 15:37 ` fabien.chene at gmail dot com
2011-09-23 21:36 ` jason at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 18+ messages in thread
From: fabien.chene at gmail dot com @ 2010-11-12 15:37 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844
Fabien Chene <fabien.chene at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
Known to fail| |
--- Comment #14 from Fabien Chene <fabien.chene at gmail dot com> 2010-11-12 14:27:36 UTC ---
Fixed.
^ permalink raw reply [flat|nested] 18+ messages in thread
end of thread, other threads:[~2014-02-20 8:44 UTC | newest]
Thread overview: 18+ messages (download: mbox.gz / follow: Atom feed)
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2010-01-22 11:27 [Bug c++/42844] New: const variable requires initializer / no explicitly declared default constructor mathieu dot malaterre at gmail dot com
2010-01-22 11:57 ` [Bug c++/42844] " redi at gcc dot gnu dot org
2010-01-22 12:27 ` redi at gcc dot gnu dot org
2010-01-22 15:56 ` pinskia at gcc dot gnu dot org
2010-01-22 15:57 ` pinskia at gcc dot gnu dot org
2010-03-30 11:40 ` fabien dot chene at gmail dot com
2010-03-30 11:44 ` dodji at redhat dot com
2010-03-30 11:51 ` fabien dot chene at gmail dot com
2010-03-30 11:56 ` redi at gcc dot gnu dot org
2010-03-30 14:11 ` fabien dot chene at gmail dot com
2010-03-30 16:47 ` fabien dot chene at gmail dot com
2010-04-12 20:45 ` fabien dot chene at gmail dot com
2010-04-20 22:49 ` fabien dot chene at gmail dot com
2010-04-27 18:56 ` jason at gcc dot gnu dot org
[not found] <bug-42844-4@http.gcc.gnu.org/bugzilla/>
2010-11-12 15:37 ` fabien.chene at gmail dot com
2011-09-23 21:36 ` jason at gcc dot gnu.org
2011-09-25 20:37 ` jason at gcc dot gnu.org
2014-02-20 8:44 ` potswa at mac dot com
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