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* [Bug c++/102545] New: inlining constexpr is required yet it should not be.
@ 2021-09-30 10:32 e9leyland at outlook dot com
2021-09-30 13:33 ` [Bug c++/102545] [modules] " e9leyland at outlook dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: e9leyland at outlook dot com @ 2021-09-30 10:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102545
Bug ID: 102545
Summary: inlining constexpr is required yet it should not be.
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: e9leyland at outlook dot com
Target Milestone: ---
I module file rev.cpp there is the following,
module;
export import <concepts>;
export import <limits>;
export module rev;
namespace rev {
export inline constexpr auto FAV_TEST_VAL = u8'9';
}
In the consumer file, main.cpp there is this,
import rev;
import <iostream>;
int
main(int, char**)
{
auto TEST_VAL = rev::FAV_TEST_VAL;
std::cout << std::hex << int(TEST_VAL) << std::endl;
}
The makefile has,
$ cat Makefile
.PHONY: default
default: main ;
gcmcache:
g++ -fmodules-ts -std=c++20 -x c++-system-header concepts
g++ -fmodules-ts -std=c++20 -x c++-system-header limits
g++ -fmodules-ts -std=c++20 -x c++-system-header iostream
rev.o: rev.cpp
g++ -c -std=c++20 -fmodules-ts rev.cpp
main: main.cpp rev.o
g++ -fmodules-ts -std=c++20 -o main main.cpp rev.o
clean:
rm rev.o main.exe rm -rf gcm.cache
The constexpr must be given the inline specifier to work, because if it is not
there the following error occurs.
$ make
g++ -c -std=c++20 -fmodules-ts rev.cpp
g++ -fmodules-ts -std=c++20 -o main main.cpp rev.o
main.cpp: In function ‘int main(int, char**)’:
main.cpp:7:26: error: ‘FAV_TEST_VAL’ is not a member of ‘rev’
7 | auto TEST_VAL = rev::FAV_TEST_VAL;
| ^~~~~~~~~~~~
make: *** [Makefile:13: main] Error 1
Shouldn't the constexpr be sufficient to inline the function from the standard?
In comparison to VS2022 the inline is not required, nor should it be.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/102545] [modules] inlining constexpr is required yet it should not be.
2021-09-30 10:32 [Bug c++/102545] New: inlining constexpr is required yet it should not be e9leyland at outlook dot com
@ 2021-09-30 13:33 ` e9leyland at outlook dot com
2021-09-30 13:41 ` jakub at gcc dot gnu.org
2024-02-11 14:07 ` nshead at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: e9leyland at outlook dot com @ 2021-09-30 13:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102545
--- Comment #1 from Emily Leyland <e9leyland at outlook dot com> ---
Good question, there seems to be some debate. From
en.cppreference.com/w/cpp/language/constexpr, A constexpr specifier used in a
function or static data member (since C++17) declaration implies inline.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/102545] [modules] inlining constexpr is required yet it should not be.
2021-09-30 10:32 [Bug c++/102545] New: inlining constexpr is required yet it should not be e9leyland at outlook dot com
2021-09-30 13:33 ` [Bug c++/102545] [modules] " e9leyland at outlook dot com
@ 2021-09-30 13:41 ` jakub at gcc dot gnu.org
2024-02-11 14:07 ` nshead at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: jakub at gcc dot gnu.org @ 2021-09-30 13:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102545
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
But the above is not a static data member, so it is not inline by default.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/102545] [modules] inlining constexpr is required yet it should not be.
2021-09-30 10:32 [Bug c++/102545] New: inlining constexpr is required yet it should not be e9leyland at outlook dot com
2021-09-30 13:33 ` [Bug c++/102545] [modules] " e9leyland at outlook dot com
2021-09-30 13:41 ` jakub at gcc dot gnu.org
@ 2024-02-11 14:07 ` nshead at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: nshead at gcc dot gnu.org @ 2024-02-11 14:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102545
Nathaniel Shead <nshead at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |nshead at gcc dot gnu.org
Status|UNCONFIRMED |RESOLVED
Assignee|unassigned at gcc dot gnu.org |nshead at gcc dot gnu.org
Resolution|--- |DUPLICATE
Target Milestone|--- |14.0
--- Comment #3 from Nathaniel Shead <nshead at gcc dot gnu.org> ---
Fixed for GCC 14 with r14-5826-g726723c4768002.
*** This bug has been marked as a duplicate of bug 99232 ***
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2024-02-11 14:07 UTC | newest]
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2021-09-30 10:32 [Bug c++/102545] New: inlining constexpr is required yet it should not be e9leyland at outlook dot com
2021-09-30 13:33 ` [Bug c++/102545] [modules] " e9leyland at outlook dot com
2021-09-30 13:41 ` jakub at gcc dot gnu.org
2024-02-11 14:07 ` nshead at gcc dot gnu.org
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