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* [Bug c++/107685] New: [C++23] P2647 - Permitting static constexpr variables in constexpr functions
@ 2022-11-14 18:30 mpolacek at gcc dot gnu.org
2022-11-14 18:30 ` [Bug c++/107685] " mpolacek at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2022-11-14 18:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107685
Bug ID: 107685
Summary: [C++23] P2647 - Permitting static constexpr variables
in constexpr functions
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mpolacek at gcc dot gnu.org
Target Milestone: ---
See <https://wg21.link/p2647>.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/107685] [C++23] P2647 - Permitting static constexpr variables in constexpr functions
2022-11-14 18:30 [Bug c++/107685] New: [C++23] P2647 - Permitting static constexpr variables in constexpr functions mpolacek at gcc dot gnu.org
@ 2022-11-14 18:30 ` mpolacek at gcc dot gnu.org
2022-11-19 9:21 ` jakub at gcc dot gnu.org
2022-11-28 22:31 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2022-11-14 18:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107685
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2022-11-14
Blocks| |98940
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Patch: <https://gcc.gnu.org/pipermail/gcc-patches/2022-November/605773.html>.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98940
[Bug 98940] Implement C++23 language features
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/107685] [C++23] P2647 - Permitting static constexpr variables in constexpr functions
2022-11-14 18:30 [Bug c++/107685] New: [C++23] P2647 - Permitting static constexpr variables in constexpr functions mpolacek at gcc dot gnu.org
2022-11-14 18:30 ` [Bug c++/107685] " mpolacek at gcc dot gnu.org
@ 2022-11-19 9:21 ` jakub at gcc dot gnu.org
2022-11-28 22:31 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jakub at gcc dot gnu.org @ 2022-11-19 9:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107685
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
https://gcc.gnu.org/g:32d16fe9d7e347bc58e7fad316ed7923e1d0f65c
commit r13-4161-g32d16fe9d7e347bc58e7fad316ed7923e1d0f65c
Author: Jakub Jelinek <jakub@redhat.com>
Date: Sat Nov 19 09:26:44 2022 +0100
c++: Implement C++23 P2647R1 - Permitting static constexpr variables in
constexpr functions
The following patch implements this paper.
Per further discussions it is implemented for C++23 only, so isn't
treated as a DR, e.g. because the part of the standard the paper is
changing didn't even exist in C++20.
And we gave up on trying to implement it as a pedwarn rather than
error for C++20 and older, because of implicit constexpr lambdas or
-fimplicit-constexpr reasons.
For C++20 and older, the only change is that passing through
definitions of static or thread_local vars usable in constant expressions
is now accepted in statement expressions if they aren't inside of constexpr
or consteval functions.
2022-11-19 Jakub Jelinek <jakub@redhat.com>
gcc/c-family/
* c-cppbuiltin.cc (c_cpp_builtins): Bump __cpp_constexpr
value from 202207L to 202211L.
gcc/cp/
* constexpr.cc (cxx_eval_constant_expression): Implement C++23
P2647R1 - Permitting static constexpr variables in constexpr
functions.
Allow DECL_EXPRs of decl_constant_var_p static or thread_local
vars.
(potential_constant_expression_1): Similarly, except use
decl_maybe_constant_var_p instead of decl_constant_var_p if
processing_template_decl.
gcc/testsuite/
* g++.dg/cpp23/constexpr-nonlit17.C: New test.
* g++.dg/cpp23/constexpr-nonlit18.C: New test.
* g++.dg/cpp23/feat-cxx2b.C: Adjust expected __cpp_constexpr
value.
* g++.dg/ext/stmtexpr19.C: Don't expect an error.
* g++.dg/ext/stmtexpr25.C: New test.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/107685] [C++23] P2647 - Permitting static constexpr variables in constexpr functions
2022-11-14 18:30 [Bug c++/107685] New: [C++23] P2647 - Permitting static constexpr variables in constexpr functions mpolacek at gcc dot gnu.org
2022-11-14 18:30 ` [Bug c++/107685] " mpolacek at gcc dot gnu.org
2022-11-19 9:21 ` jakub at gcc dot gnu.org
@ 2022-11-28 22:31 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-11-28 22:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107685
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |13.0
^ permalink raw reply [flat|nested] 4+ messages in thread
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2022-11-14 18:30 [Bug c++/107685] New: [C++23] P2647 - Permitting static constexpr variables in constexpr functions mpolacek at gcc dot gnu.org
2022-11-14 18:30 ` [Bug c++/107685] " mpolacek at gcc dot gnu.org
2022-11-19 9:21 ` jakub at gcc dot gnu.org
2022-11-28 22:31 ` pinskia at gcc dot gnu.org
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