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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] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 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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