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* [Bug c++/109021] New: accept size parameter in extern C @ 2023-03-04 12:02 muecker at gwdg dot de 2023-03-04 15:18 ` [Bug c++/109021] " pinskia at gcc dot gnu.org ` (5 more replies) 0 siblings, 6 replies; 7+ messages in thread From: muecker at gwdg dot de @ 2023-03-04 12:02 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109021 Bug ID: 109021 Summary: accept size parameter in extern C Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: muecker at gwdg dot de Target Milestone: --- A problem I encounter sometimes when using newer C headers in C++ is with functions that have array argument with a size parameter: extern "C" void foo(int N, char buf[N]); I think g++ should accept this in general or only for extern "C". At least for 1D arrays this should be easy as it could simply ignore the size and only emit a diagnostic with -pedantic. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/109021] accept size parameter in extern C 2023-03-04 12:02 [Bug c++/109021] New: accept size parameter in extern C muecker at gwdg dot de @ 2023-03-04 15:18 ` pinskia at gcc dot gnu.org 2023-03-04 15:31 ` muecker at gwdg dot de ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-03-04 15:18 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109021 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- extern "C" just changes the language linkage but does not change the language which the declaration is written in. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/109021] accept size parameter in extern C 2023-03-04 12:02 [Bug c++/109021] New: accept size parameter in extern C muecker at gwdg dot de 2023-03-04 15:18 ` [Bug c++/109021] " pinskia at gcc dot gnu.org @ 2023-03-04 15:31 ` muecker at gwdg dot de 2023-08-06 13:58 ` schwab@linux-m68k.org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: muecker at gwdg dot de @ 2023-03-04 15:31 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109021 --- Comment #2 from Martin Uecker <muecker at gwdg dot de> --- True. But we could still take it as a hint about where this is not useful to users to diagnose this as an error. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/109021] accept size parameter in extern C 2023-03-04 12:02 [Bug c++/109021] New: accept size parameter in extern C muecker at gwdg dot de 2023-03-04 15:18 ` [Bug c++/109021] " pinskia at gcc dot gnu.org 2023-03-04 15:31 ` muecker at gwdg dot de @ 2023-08-06 13:58 ` schwab@linux-m68k.org 2023-08-15 13:19 ` muecker at gwdg dot de ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: schwab@linux-m68k.org @ 2023-08-06 13:58 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109021 --- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> --- *** Bug 110920 has been marked as a duplicate of this bug. *** ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/109021] accept size parameter in extern C 2023-03-04 12:02 [Bug c++/109021] New: accept size parameter in extern C muecker at gwdg dot de ` (2 preceding siblings ...) 2023-08-06 13:58 ` schwab@linux-m68k.org @ 2023-08-15 13:19 ` muecker at gwdg dot de 2023-08-15 23:53 ` pinskia at gcc dot gnu.org 2023-08-17 6:56 ` muecker at gwdg dot de 5 siblings, 0 replies; 7+ messages in thread From: muecker at gwdg dot de @ 2023-08-15 13:19 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109021 --- Comment #4 from Martin Uecker <muecker at gwdg dot de> --- Sorry, how can an enhancement request that addresses a real C/C++ compatibility problem be marked "resolved invalid" ? ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/109021] accept size parameter in extern C 2023-03-04 12:02 [Bug c++/109021] New: accept size parameter in extern C muecker at gwdg dot de ` (3 preceding siblings ...) 2023-08-15 13:19 ` muecker at gwdg dot de @ 2023-08-15 23:53 ` pinskia at gcc dot gnu.org 2023-08-17 6:56 ` muecker at gwdg dot de 5 siblings, 0 replies; 7+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-15 23:53 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109021 --- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Martin Uecker from comment #4) > Sorry, how can an enhancement request that addresses a real C/C++ > compatibility problem be marked "resolved invalid" ? Because GCC does like these days to add huge extensions to the C++ language. Maybe you could bring this up to WG21 (C++ standards committee) as a paper which fully thought out (and an implementation either GCC or clang as an open source example). GCC might take that implementation and have it as an extension ... ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/109021] accept size parameter in extern C 2023-03-04 12:02 [Bug c++/109021] New: accept size parameter in extern C muecker at gwdg dot de ` (4 preceding siblings ...) 2023-08-15 23:53 ` pinskia at gcc dot gnu.org @ 2023-08-17 6:56 ` muecker at gwdg dot de 5 siblings, 0 replies; 7+ messages in thread From: muecker at gwdg dot de @ 2023-08-17 6:56 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109021 --- Comment #6 from Martin Uecker <muecker at gwdg dot de> --- Note that I do not propose to add variably modified types to C++. This would indeed be a major extension. I simply propose to ignore the size expressions in C headers as a usability improvement. My patch I have somewhere for this are a couple lines of code. I plan to bring this up to WG21 anyway, but standards should ideally standardize things where there exists prior experience. It would be helpful if GCC takes part in this process. ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2023-08-17 6:56 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-03-04 12:02 [Bug c++/109021] New: accept size parameter in extern C muecker at gwdg dot de 2023-03-04 15:18 ` [Bug c++/109021] " pinskia at gcc dot gnu.org 2023-03-04 15:31 ` muecker at gwdg dot de 2023-08-06 13:58 ` schwab@linux-m68k.org 2023-08-15 13:19 ` muecker at gwdg dot de 2023-08-15 23:53 ` pinskia at gcc dot gnu.org 2023-08-17 6:56 ` muecker at gwdg dot de
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