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* [Bug c++/111122] New: local temps from get_nsdmi -> break_out_target_exprs break constexpr evaluation
@ 2023-08-23 19:50 jakub at gcc dot gnu.org
2023-08-23 19:56 ` [Bug c++/111122] " pinskia at gcc dot gnu.org
2023-08-23 20:01 ` jakub at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: jakub at gcc dot gnu.org @ 2023-08-23 19:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111122
Bug ID: 111122
Summary: local temps from get_nsdmi -> break_out_target_exprs
break constexpr evaluation
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jakub at gcc dot gnu.org
Target Milestone: ---
struct T {
const char *d = new char[2] { 'o', 'k' };
constexpr int size () const { return 2; }
constexpr const char *data () const { return d; }
constexpr ~T () { delete[] d; }
};
constexpr int a = T{}.size ();
constexpr int b = T{}.data ()[0];
//constexpr const char *c = T{}.data ();
is rejected by g++ with
test42.C:7:29: error: the value of ‘<anonymous>’ is not usable in a constant
expression
7 | constexpr int a = T{}.size ();
| ^
test42.C:7:21: note: ‘<anonymous>’ was not declared ‘constexpr’
7 | constexpr int a = T{}.size ();
| ^
test42.C:8:32: error: the value of ‘<anonymous>’ is not usable in a constant
expression
8 | constexpr int b = T{}.data ()[0];
| ^
test42.C:8:21: note: ‘<anonymous>’ was not declared ‘constexpr’
8 | constexpr int b = T{}.data ()[0];
| ^
during potential_constant_expression_1,
while clang++ accepts it.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/111122] local temps from get_nsdmi -> break_out_target_exprs break constexpr evaluation
2023-08-23 19:50 [Bug c++/111122] New: local temps from get_nsdmi -> break_out_target_exprs break constexpr evaluation jakub at gcc dot gnu.org
@ 2023-08-23 19:56 ` pinskia at gcc dot gnu.org
2023-08-23 20:01 ` jakub at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-08-23 19:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111122
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Try from inside a function instead. There is another bug about local Temps used
from constexpr from a non-function scope causinbissues.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/111122] local temps from get_nsdmi -> break_out_target_exprs break constexpr evaluation
2023-08-23 19:50 [Bug c++/111122] New: local temps from get_nsdmi -> break_out_target_exprs break constexpr evaluation jakub at gcc dot gnu.org
2023-08-23 19:56 ` [Bug c++/111122] " pinskia at gcc dot gnu.org
@ 2023-08-23 20:01 ` jakub at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: jakub at gcc dot gnu.org @ 2023-08-23 20:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111122
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Sure,
struct T {
const char *d = init ();
constexpr int size () const { return 2; }
constexpr const char *data () const { return d; }
constexpr const char *init () const { return new char[2] { 'o', 'k' }; }
constexpr ~T () { delete[] d; }
};
constexpr int a = T{}.size ();
constexpr int b = T{}.data ()[0];
works.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-08-23 20:01 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2023-08-23 19:50 [Bug c++/111122] New: local temps from get_nsdmi -> break_out_target_exprs break constexpr evaluation jakub at gcc dot gnu.org
2023-08-23 19:56 ` [Bug c++/111122] " pinskia at gcc dot gnu.org
2023-08-23 20:01 ` jakub at gcc dot gnu.org
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