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* [Bug c++/86974] Support Clang's require_constant_initialization attribute
[not found] <bug-86974-4@http.gcc.gnu.org/bugzilla/>
@ 2022-03-16 16:32 ` marc.mutz at hotmail dot com
2022-03-16 16:40 ` jakub at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: marc.mutz at hotmail dot com @ 2022-03-16 16:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86974
Marc Mutz <marc.mutz at hotmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |marc.mutz at hotmail dot com
--- Comment #5 from Marc Mutz <marc.mutz at hotmail dot com> ---
Not really superseded by constinit. constinit is only available in C++20. If
you want constinit, you get all of C++20. OTOH,
[[clang::require_constant_initialization]] works all the way back to C++11.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/86974] Support Clang's require_constant_initialization attribute
[not found] <bug-86974-4@http.gcc.gnu.org/bugzilla/>
2022-03-16 16:32 ` [Bug c++/86974] Support Clang's require_constant_initialization attribute marc.mutz at hotmail dot com
@ 2022-03-16 16:40 ` jakub at gcc dot gnu.org
2022-03-16 16:41 ` marc.mutz at hotmail dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2022-03-16 16:40 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86974
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
GCC does support __constinit as an alternate spelling of constinit, and while
constinit is only available in -std=c++20 and later, __constinit is available
even in C++11.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/86974] Support Clang's require_constant_initialization attribute
[not found] <bug-86974-4@http.gcc.gnu.org/bugzilla/>
2022-03-16 16:32 ` [Bug c++/86974] Support Clang's require_constant_initialization attribute marc.mutz at hotmail dot com
2022-03-16 16:40 ` jakub at gcc dot gnu.org
@ 2022-03-16 16:41 ` marc.mutz at hotmail dot com
2022-03-16 17:01 ` redi at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: marc.mutz at hotmail dot com @ 2022-03-16 16:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86974
--- Comment #7 from Marc Mutz <marc.mutz at hotmail dot com> ---
Fantastic! Thanks for the tip!
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/86974] Support Clang's require_constant_initialization attribute
[not found] <bug-86974-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2022-03-16 16:41 ` marc.mutz at hotmail dot com
@ 2022-03-16 17:01 ` redi at gcc dot gnu.org
2022-03-16 17:02 ` redi at gcc dot gnu.org
2022-03-16 17:04 ` jakub at gcc dot gnu.org
5 siblings, 0 replies; 6+ messages in thread
From: redi at gcc dot gnu.org @ 2022-03-16 17:01 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86974
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
libstdc++ sources do this:
#if __has_cpp_attribute(clang::require_constant_initialization)
# define __constinit [[clang::require_constant_initialization]]
#endif
An alternative that doesn't use reserved names and so is suitable for user code
would be:
#if __cpp_constinit
# define CONSTINIT constinit
#if __has_cpp_attribute(clang::require_constant_initialization)
# define CONSTINIT [[clang::require_constant_initialization]]
#elif __GNUC__ >= 10
# define CONSTINIT __constinit
#else
# define CONSTINIT
#endif
And then:
CONSTINIT S2 objx;
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/86974] Support Clang's require_constant_initialization attribute
[not found] <bug-86974-4@http.gcc.gnu.org/bugzilla/>
` (3 preceding siblings ...)
2022-03-16 17:01 ` redi at gcc dot gnu.org
@ 2022-03-16 17:02 ` redi at gcc dot gnu.org
2022-03-16 17:04 ` jakub at gcc dot gnu.org
5 siblings, 0 replies; 6+ messages in thread
From: redi at gcc dot gnu.org @ 2022-03-16 17:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86974
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Oops, the second #if should be #elif
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/86974] Support Clang's require_constant_initialization attribute
[not found] <bug-86974-4@http.gcc.gnu.org/bugzilla/>
` (4 preceding siblings ...)
2022-03-16 17:02 ` redi at gcc dot gnu.org
@ 2022-03-16 17:04 ` jakub at gcc dot gnu.org
5 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2022-03-16 17:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86974
--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
One can't take __has_cpp_attribute support for granted, so perhaps that needs
to be wrapped inside ifdef.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-03-16 17:04 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2022-03-16 16:32 ` [Bug c++/86974] Support Clang's require_constant_initialization attribute marc.mutz at hotmail dot com
2022-03-16 16:40 ` jakub at gcc dot gnu.org
2022-03-16 16:41 ` marc.mutz at hotmail dot com
2022-03-16 17:01 ` redi at gcc dot gnu.org
2022-03-16 17:02 ` redi at gcc dot gnu.org
2022-03-16 17:04 ` jakub at gcc dot gnu.org
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