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* [Bug c/114266] New: No -pedantic diagnostic for zero-sized array in compound literals @ 2024-03-07 10:50 daniel.lundin.mail at gmail dot com 2024-03-07 10:52 ` [Bug c/114266] " daniel.lundin.mail at gmail dot com ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: daniel.lundin.mail at gmail dot com @ 2024-03-07 10:50 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114266 Bug ID: 114266 Summary: No -pedantic diagnostic for zero-sized array in compound literals Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: daniel.lundin.mail at gmail dot com Target Milestone: --- (int[]){}; produces no diagnostics with -std=c23 -pedantic. Empty initalizer lists are OK under -std=c23 and -std=gnu so that's not the problem. gcc correctly gives a diagnostic for that in -std=c17 -pedantic mode. Zero-sized arrays should however give a diagnostic in -std=cxx -pedantic mode. Prior to C23 this was not really a problem as we would get a diagnostic for the empty initializer list. But now this non-conforming C compiles cleanly even with -pedantic set. A diagnostic similar to the one given in clang would be good: warning: zero size arrays are an extension [-Wzero-length-array] As I understand it, gcc did have -Wzero-length-array in the past but removed it? See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94428. The options -Wstrict-flex-arrays -fstrict-flex-arrays seem to have no effect (and my example isn't a flexible array member but a compound literal). ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/114266] No -pedantic diagnostic for zero-sized array in compound literals 2024-03-07 10:50 [Bug c/114266] New: No -pedantic diagnostic for zero-sized array in compound literals daniel.lundin.mail at gmail dot com @ 2024-03-07 10:52 ` daniel.lundin.mail at gmail dot com 2024-03-07 16:43 ` jsm28 at gcc dot gnu.org 2024-03-08 7:25 ` daniel.lundin.mail at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: daniel.lundin.mail at gmail dot com @ 2024-03-07 10:52 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114266 --- Comment #1 from Daniel Lundin <daniel.lundin.mail at gmail dot com> --- Created attachment 57643 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57643&action=edit Complete example ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/114266] No -pedantic diagnostic for zero-sized array in compound literals 2024-03-07 10:50 [Bug c/114266] New: No -pedantic diagnostic for zero-sized array in compound literals daniel.lundin.mail at gmail dot com 2024-03-07 10:52 ` [Bug c/114266] " daniel.lundin.mail at gmail dot com @ 2024-03-07 16:43 ` jsm28 at gcc dot gnu.org 2024-03-08 7:25 ` daniel.lundin.mail at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: jsm28 at gcc dot gnu.org @ 2024-03-07 16:43 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114266 Joseph S. Myers <jsm28 at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Status|UNCONFIRMED |NEW Last reconfirmed| |2024-03-07 --- Comment #2 from Joseph S. Myers <jsm28 at gcc dot gnu.org> --- The relevant constraint here is "An array of unknown size shall not be initialized by an empty initializer.". ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/114266] No -pedantic diagnostic for zero-sized array in compound literals 2024-03-07 10:50 [Bug c/114266] New: No -pedantic diagnostic for zero-sized array in compound literals daniel.lundin.mail at gmail dot com 2024-03-07 10:52 ` [Bug c/114266] " daniel.lundin.mail at gmail dot com 2024-03-07 16:43 ` jsm28 at gcc dot gnu.org @ 2024-03-08 7:25 ` daniel.lundin.mail at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: daniel.lundin.mail at gmail dot com @ 2024-03-08 7:25 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114266 --- Comment #3 from Daniel Lundin <daniel.lundin.mail at gmail dot com> --- (In reply to Joseph S. Myers from comment #2) > The relevant constraint here is "An array of unknown size shall not be > initialized by an empty initializer.". Indeed! I didn't realize it was also a constraint (C23 6.7.10). That probably means that a diagnostic warning should always be given and not just in -pedantic mode. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2024-03-08 7:25 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2024-03-07 10:50 [Bug c/114266] New: No -pedantic diagnostic for zero-sized array in compound literals daniel.lundin.mail at gmail dot com 2024-03-07 10:52 ` [Bug c/114266] " daniel.lundin.mail at gmail dot com 2024-03-07 16:43 ` jsm28 at gcc dot gnu.org 2024-03-08 7:25 ` daniel.lundin.mail at gmail dot com
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