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* [Bug c++/67910] New: Two autos in a single function confuses the type system
@ 2015-10-09 16:46 guille at cal dot berkeley.edu
2015-10-09 16:48 ` [Bug c++/67910] " guille at cal dot berkeley.edu
` (6 more replies)
0 siblings, 7 replies; 8+ messages in thread
From: guille at cal dot berkeley.edu @ 2015-10-09 16:46 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67910
Bug ID: 67910
Summary: Two autos in a single function confuses the type
system
Product: gcc
Version: 5.2.0
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: guille at cal dot berkeley.edu
Target Milestone: ---
The following code does not compile on 5.2.0:
struct A {};
struct B {};
static auto f(auto b) -> A { return A(); }
int main()
{
A a = f(B());
return 0;
}
whereas the following *does* compile:
struct A {};
struct B {};
static auto f(B b) -> A { return A(); }
int main()
{
__attribute__((unused)) A a = f(B());
return 0;
}
In the first (failing) case, the type system thinks that 'f' returns the same
type as the first auto *argument*, even though the return type is specified to
be 'A'.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/67910] Two autos in a single function confuses the type system
2015-10-09 16:46 [Bug c++/67910] New: Two autos in a single function confuses the type system guille at cal dot berkeley.edu
@ 2015-10-09 16:48 ` guille at cal dot berkeley.edu
2015-10-09 16:50 ` guille at cal dot berkeley.edu
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: guille at cal dot berkeley.edu @ 2015-10-09 16:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67910
--- Comment #1 from Guille <guille at cal dot berkeley.edu> ---
Ignore "__attribute__((unused))", it was added by mistake.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/67910] Two autos in a single function confuses the type system
2015-10-09 16:46 [Bug c++/67910] New: Two autos in a single function confuses the type system guille at cal dot berkeley.edu
2015-10-09 16:48 ` [Bug c++/67910] " guille at cal dot berkeley.edu
@ 2015-10-09 16:50 ` guille at cal dot berkeley.edu
2015-10-09 16:51 ` guille at cal dot berkeley.edu
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: guille at cal dot berkeley.edu @ 2015-10-09 16:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67910
--- Comment #2 from Guille <guille at cal dot berkeley.edu> ---
struct A {};
struct B {};
static auto f(auto b) -> A { return A(); } // error: could not convert 'A()'
from 'A' to 'B'
int main()
{
A a = f(B()); // error: conversion from 'B' to non-scalar type 'A'
requested
return 0;
}
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/67910] Two autos in a single function confuses the type system
2015-10-09 16:46 [Bug c++/67910] New: Two autos in a single function confuses the type system guille at cal dot berkeley.edu
2015-10-09 16:48 ` [Bug c++/67910] " guille at cal dot berkeley.edu
2015-10-09 16:50 ` guille at cal dot berkeley.edu
@ 2015-10-09 16:51 ` guille at cal dot berkeley.edu
2015-10-09 17:17 ` glisse at gcc dot gnu.org
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: guille at cal dot berkeley.edu @ 2015-10-09 16:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67910
--- Comment #3 from Guille <guille at cal dot berkeley.edu> ---
gcc 5.2.0: -Wall -Wextra -std=c++1y
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/67910] Two autos in a single function confuses the type system
2015-10-09 16:46 [Bug c++/67910] New: Two autos in a single function confuses the type system guille at cal dot berkeley.edu
` (2 preceding siblings ...)
2015-10-09 16:51 ` guille at cal dot berkeley.edu
@ 2015-10-09 17:17 ` glisse at gcc dot gnu.org
2015-10-09 19:44 ` guille at cal dot berkeley.edu
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: glisse at gcc dot gnu.org @ 2015-10-09 17:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67910
Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|major |normal
--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
This seems to be already fixed on trunk.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/67910] Two autos in a single function confuses the type system
2015-10-09 16:46 [Bug c++/67910] New: Two autos in a single function confuses the type system guille at cal dot berkeley.edu
` (3 preceding siblings ...)
2015-10-09 17:17 ` glisse at gcc dot gnu.org
@ 2015-10-09 19:44 ` guille at cal dot berkeley.edu
2015-10-10 5:39 ` guille at cal dot berkeley.edu
2015-10-10 5:41 ` guille at cal dot berkeley.edu
6 siblings, 0 replies; 8+ messages in thread
From: guille at cal dot berkeley.edu @ 2015-10-09 19:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67910
--- Comment #5 from Guille <guille at cal dot berkeley.edu> ---
(In reply to Marc Glisse from comment #4)
> This seems to be already fixed on trunk.
Just tested on most recent gcc version 5.2.1 20151006 (GCC) and it doesn't
compile:
t.c: In function ‘int main()’:
t.c:10:12: error: conversion from ‘B’ to non-scalar type ‘A’ requested
A a = f(B());
^
t.c: In instantiation of ‘auto:1 f(auto:1) [with auto:1 = B]’:
t.c:10:16: required from here
t.c:6:39: error: could not convert ‘A()’ from ‘A’ to ‘B’
static auto f(auto b) -> A { return A(); }
^
>From gcc-bugs-return-499172-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 09 21:32:42 2015
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/67913] New: new expression with negative size not diagnosed
Date: Fri, 09 Oct 2015 21:32:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 6.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: msebor at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg913
Bug ID: 67913
Summary: new expression with negative size not diagnosed
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
A new expression is considered erroneous if the expression in its
noptr-new-declarator is of non-class type and its value before converting to
std::size_t is less than zero. If the expression is a constant expression, the
program is ill-fomed. The following program contains two such ill-formed
expressions is not diagnosed by GCC.
void* operator new[] (unsigned long, void *p) { return p; }
void foo (void)
{
char c;
new char [-1];
new (&c) char [-1];
}
Clang issues the following warnings for it:
a.cpp:6:15: warning: array size is negative [-Wbad-array-new-length]
new char [-1];
^~
a.cpp:7:20: warning: array size is negative [-Wbad-array-new-length]
new (&c) char [-1];
^~
2 warnings generated.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/67910] Two autos in a single function confuses the type system
2015-10-09 16:46 [Bug c++/67910] New: Two autos in a single function confuses the type system guille at cal dot berkeley.edu
` (4 preceding siblings ...)
2015-10-09 19:44 ` guille at cal dot berkeley.edu
@ 2015-10-10 5:39 ` guille at cal dot berkeley.edu
2015-10-10 5:41 ` guille at cal dot berkeley.edu
6 siblings, 0 replies; 8+ messages in thread
From: guille at cal dot berkeley.edu @ 2015-10-10 5:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67910
--- Comment #6 from Guille <guille at cal dot berkeley.edu> ---
Can confirm it does compile on gcc version 6.0.0 20151004.
^ permalink raw reply [flat|nested] 8+ messages in thread
* [Bug c++/67910] Two autos in a single function confuses the type system
2015-10-09 16:46 [Bug c++/67910] New: Two autos in a single function confuses the type system guille at cal dot berkeley.edu
` (5 preceding siblings ...)
2015-10-10 5:39 ` guille at cal dot berkeley.edu
@ 2015-10-10 5:41 ` guille at cal dot berkeley.edu
6 siblings, 0 replies; 8+ messages in thread
From: guille at cal dot berkeley.edu @ 2015-10-10 5:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67910
Guille <guille at cal dot berkeley.edu> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #7 from Guille <guille at cal dot berkeley.edu> ---
Can confirm it does compile on gcc version 6.0.0 20151004.
^ permalink raw reply [flat|nested] 8+ messages in thread
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2015-10-09 16:46 [Bug c++/67910] New: Two autos in a single function confuses the type system guille at cal dot berkeley.edu
2015-10-09 16:48 ` [Bug c++/67910] " guille at cal dot berkeley.edu
2015-10-09 16:50 ` guille at cal dot berkeley.edu
2015-10-09 16:51 ` guille at cal dot berkeley.edu
2015-10-09 17:17 ` glisse at gcc dot gnu.org
2015-10-09 19:44 ` guille at cal dot berkeley.edu
2015-10-10 5:39 ` guille at cal dot berkeley.edu
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