* [Bug c++/85428] constexpr pointer equality comparison not considered constant expression
[not found] <bug-85428-4@http.gcc.gnu.org/bugzilla/>
@ 2021-01-31 16:56 ` barry.revzin at gmail dot com
2021-11-24 7:46 ` fchelnokov at gmail dot com
` (4 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: barry.revzin at gmail dot com @ 2021-01-31 16:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85428
Barry Revzin <barry.revzin at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |barry.revzin at gmail dot com
--- Comment #1 from Barry Revzin <barry.revzin at gmail dot com> ---
Here's a different, C++20-specific test case:
constexpr bool f() {
int* a = new int;
int* b = new int;
bool result = (a == b);
delete a;
delete b;
return result;
}
static_assert(!f());
Also rejected as non-constant comparison.
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug c++/85428] constexpr pointer equality comparison not considered constant expression
[not found] <bug-85428-4@http.gcc.gnu.org/bugzilla/>
2021-01-31 16:56 ` [Bug c++/85428] constexpr pointer equality comparison not considered constant expression barry.revzin at gmail dot com
@ 2021-11-24 7:46 ` fchelnokov at gmail dot com
2021-12-28 10:46 ` pinskia at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: fchelnokov at gmail dot com @ 2021-11-24 7:46 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85428
Fedor Chelnokov <fchelnokov at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fchelnokov at gmail dot com
--- Comment #2 from Fedor Chelnokov <fchelnokov at gmail dot com> ---
Here is an example without templates that erroneously fails to compile as well:
```
int main() {
static constexpr int x = 1;
static constexpr int y = 2;
static_assert( &x != &y );
}
```
Demo: https://gcc.godbolt.org/z/3WdqP49Gq
Related discussion: https://stackoverflow.com/q/70091821/7325599
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug c++/85428] constexpr pointer equality comparison not considered constant expression
[not found] <bug-85428-4@http.gcc.gnu.org/bugzilla/>
2021-01-31 16:56 ` [Bug c++/85428] constexpr pointer equality comparison not considered constant expression barry.revzin at gmail dot com
2021-11-24 7:46 ` fchelnokov at gmail dot com
@ 2021-12-28 10:46 ` pinskia at gcc dot gnu.org
2021-12-28 10:48 ` pinskia at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-12-28 10:46 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85428
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jorg.brown at gmail dot com
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 91693 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug c++/85428] constexpr pointer equality comparison not considered constant expression
[not found] <bug-85428-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2021-12-28 10:46 ` pinskia at gcc dot gnu.org
@ 2021-12-28 10:48 ` pinskia at gcc dot gnu.org
2021-12-28 10:53 ` pinskia at gcc dot gnu.org
2022-01-06 15:56 ` ppalka at gcc dot gnu.org
5 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-12-28 10:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85428
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Barry Revzin from comment #1)
> Also rejected as non-constant comparison.
That is a different issue and was fixed for GCC 10.3.0 and GCC 11+.
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug c++/85428] constexpr pointer equality comparison not considered constant expression
[not found] <bug-85428-4@http.gcc.gnu.org/bugzilla/>
` (3 preceding siblings ...)
2021-12-28 10:48 ` pinskia at gcc dot gnu.org
@ 2021-12-28 10:53 ` pinskia at gcc dot gnu.org
2022-01-06 15:56 ` ppalka at gcc dot gnu.org
5 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-12-28 10:53 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85428
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For the first testcase, here is a reduced testcase:
template <int> char hh= 0;
static_assert(&hh<0> != &hh<1>, "should not be equal");
----- CUT ----
Note the above is even valid C++14.
And here is the reduced valid C++11 testcase:
template <int> struct a
{
static const char hh= 0;
};
static_assert(&a<0>::hh!=&a<1>::hh, "");
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug c++/85428] constexpr pointer equality comparison not considered constant expression
[not found] <bug-85428-4@http.gcc.gnu.org/bugzilla/>
` (4 preceding siblings ...)
2021-12-28 10:53 ` pinskia at gcc dot gnu.org
@ 2022-01-06 15:56 ` ppalka at gcc dot gnu.org
5 siblings, 0 replies; 6+ messages in thread
From: ppalka at gcc dot gnu.org @ 2022-01-06 15:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85428
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |12.0
Status|NEW |RESOLVED
Resolution|--- |FIXED
CC| |ppalka at gcc dot gnu.org
--- Comment #6 from Patrick Palka <ppalka at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> (In reply to Barry Revzin from comment #1)
> > Also rejected as non-constant comparison.
>
> That is a different issue and was fixed for GCC 10.3.0 and GCC 11+.
By r11-7176 FWIW
The other testcases are basically PR94716, and are accepted by GCC 12 since
r12-6188
^ permalink raw reply [flat|nested] 6+ messages in thread