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* [Bug c++/60760] New: arithmetic on null pointers should not be allowed in constant expressions
@ 2014-04-04 14:53 redi at gcc dot gnu.org
2014-04-04 17:43 ` [Bug c++/60760] " daniel.kruegler at googlemail dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: redi at gcc dot gnu.org @ 2014-04-04 14:53 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60760
Bug ID: 60760
Summary: arithmetic on null pointers should not be allowed in
constant expressions
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Keywords: accepts-invalid
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
G++ should not compile this:
constexpr int* ptr = nullptr;
constexpr int* ptr2 = ptr + 1;
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/60760] arithmetic on null pointers should not be allowed in constant expressions
2014-04-04 14:53 [Bug c++/60760] New: arithmetic on null pointers should not be allowed in constant expressions redi at gcc dot gnu.org
@ 2014-04-04 17:43 ` daniel.kruegler at googlemail dot com
2014-04-04 18:08 ` daniel.kruegler at googlemail dot com
2014-12-14 16:27 ` ville.voutilainen at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2014-04-04 17:43 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60760
Daniel Krügler <daniel.kruegler at googlemail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |daniel.kruegler@googlemail.
| |com
--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
Agreed. But it should still be possible to add the additive identity (The core
language drafted to support this):
constexpr int* ptr = nullptr;
constexpr int x = 0;
constexpr int* ptr2 = ptr + x;
>From gcc-bugs-return-448322-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 04 17:53:59 2014
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/60760] arithmetic on null pointers should not be allowed in constant expressions
Date: Fri, 04 Apr 2014 17:53:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, we rely on that in initializer_list<>::end(), and clang rejects that.
I discussed that case with Jason and we think [expr.add] could be clarified -
do you have an existing issue number related to that?
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/60760] arithmetic on null pointers should not be allowed in constant expressions
2014-04-04 14:53 [Bug c++/60760] New: arithmetic on null pointers should not be allowed in constant expressions redi at gcc dot gnu.org
2014-04-04 17:43 ` [Bug c++/60760] " daniel.kruegler at googlemail dot com
@ 2014-04-04 18:08 ` daniel.kruegler at googlemail dot com
2014-12-14 16:27 ` ville.voutilainen at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2014-04-04 18:08 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60760
--- Comment #3 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
(In reply to Jonathan Wakely from comment #2)
> Yes, we rely on that in initializer_list<>::end(), and clang rejects that.
<nod>
> I discussed that case with Jason and we think [expr.add] could be clarified
> - do you have an existing issue number related to that?
I haven't - I myself found the existing wording always clear in that regard.
>From gcc-bugs-return-448326-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Apr 04 18:36:53 2014
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From: "mikael at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/60718] Test case gfortran.dg/select_type_4.f90 fails on ARM
Date: Fri, 04 Apr 2014 18:36:00 -0000
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Mikael Morin <mikael at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mikael at gcc dot gnu.org
--- Comment #7 from Mikael Morin <mikael at gcc dot gnu.org> ---
(In reply to Bernd Edlinger from comment #6)
> hmm,
>
> gfc_build_class_symbol creates different types,
> if a class has the allocatable, target or pointer attribute.
>
[...]
>
> But the class(xxx), pointer is passed to class(xxx), target when
> used as a procedure parameter. this makes one type alias another.
>
> maybe the test case is wrong, passing one flavor of object to
> another?
>
This is not a problem; a pointer has the target attribute.
In fortran pointers are not first class citizens, so a pointer variable is the
pointer's target.
I would say that gfc_build_class_symbol should look at the attr->target instead
of attr->pointer, but I don't know how much fallout would come from that.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/60760] arithmetic on null pointers should not be allowed in constant expressions
2014-04-04 14:53 [Bug c++/60760] New: arithmetic on null pointers should not be allowed in constant expressions redi at gcc dot gnu.org
2014-04-04 17:43 ` [Bug c++/60760] " daniel.kruegler at googlemail dot com
2014-04-04 18:08 ` daniel.kruegler at googlemail dot com
@ 2014-12-14 16:27 ` ville.voutilainen at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: ville.voutilainen at gmail dot com @ 2014-12-14 16:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60760
Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2014-12-14
CC| |ville.voutilainen at gmail dot com
Ever confirmed|0 |1
Known to fail| |4.8.2, 4.9.1, 5.0
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2014-04-04 14:53 [Bug c++/60760] New: arithmetic on null pointers should not be allowed in constant expressions redi at gcc dot gnu.org
2014-04-04 17:43 ` [Bug c++/60760] " daniel.kruegler at googlemail dot com
2014-04-04 18:08 ` daniel.kruegler at googlemail dot com
2014-12-14 16:27 ` ville.voutilainen at gmail dot com
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