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* [Bug c++/108114] New: Designated initialization of parent class results in error in C++20 mode @ 2022-12-14 20:06 gawain.bolton at free dot fr 2022-12-14 20:14 ` [Bug c++/108114] " pinskia at gcc dot gnu.org 2022-12-14 20:16 ` pinskia at gcc dot gnu.org 0 siblings, 2 replies; 3+ messages in thread From: gawain.bolton at free dot fr @ 2022-12-14 20:06 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108114 Bug ID: 108114 Summary: Designated initialization of parent class results in error in C++20 mode Product: gcc Version: 12.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: gawain.bolton at free dot fr Target Milestone: --- Created attachment 54095 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54095&action=edit Code accepted with -std=c++17 and rejected with -std=c++20 The attached code generates the following error when compiled with -std=c++20: <source>: In function 'int main()': <source>:11:19: error: either all initializer clauses should be designated or none of them should be 11 | B b{{.a = 0}, .b = 1}; | ^ From my understanding of the C++20 standard (cf. https://eel.is/c++draft/dcl.init.general#nt:brace-or-equal-initializer) this code attached is valid since a designated-initializer-clause may be a braced-init-list. This code has no error or warning about designated initialization with -std=c++17 Clang generates a warning about mixed designated/non-designated initialization, which I believe is not merited, but this is not an error. ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/108114] Designated initialization of parent class results in error in C++20 mode 2022-12-14 20:06 [Bug c++/108114] New: Designated initialization of parent class results in error in C++20 mode gawain.bolton at free dot fr @ 2022-12-14 20:14 ` pinskia at gcc dot gnu.org 2022-12-14 20:16 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-12-14 20:14 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108114 --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- clang gives: <source>:11:19: warning: mixture of designated and non-designated initializers in the same initializer list is a C99 extension [-Wc99-designator] B b{{.a = 0}, .b = 1}; ^~~~~~ <source>:11:9: note: first non-designated initializer is here B b{{.a = 0}, .b = 1}; ^~~~~~~~ With -std=c++17 -pedantic GCC produces: <source>: In function 'int main()': <source>:11:10: warning: C++ designated initializers only available with '-std=c++20' or '-std=gnu++20' [-Wc++20-extensions] 11 | B b{{.a = 0}, .b = 1}; | ^ <source>:11:19: warning: C++ designated initializers only available with '-std=c++20' or '-std=gnu++20' [-Wc++20-extensions] 11 | B b{{.a = 0}, .b = 1}; | ^ In GCC 7 (and before) -std=c++17 -pedantic GCC gives: <source>: In function 'int main()': <source>:11:9: warning: ISO C++ does not allow C99 designated initializers [-Wpedantic] B b{{.a = 0}, .b = 1}; ^ <source>:11:17: warning: ISO C++ does not allow C99 designated initializers [-Wpedantic] B b{{.a = 0}, .b = 1}; ^ Most likely just a difference between C99 and C++20 support. Also note "but this is not an error" is because if you use -pedantic-errors you would get an error with clang and even GCC with -std=c++17. ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/108114] Designated initialization of parent class results in error in C++20 mode 2022-12-14 20:06 [Bug c++/108114] New: Designated initialization of parent class results in error in C++20 mode gawain.bolton at free dot fr 2022-12-14 20:14 ` [Bug c++/108114] " pinskia at gcc dot gnu.org @ 2022-12-14 20:16 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2022-12-14 20:16 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108114 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Gawain Bolton from comment #0) > From my understanding of the C++20 standard (cf. > https://eel.is/c++draft/dcl.init.general#nt:brace-or-equal-initializer) > this code attached is valid since a designated-initializer-clause may be a > braced-init-list. https://eel.is/c++draft/dcl.init.general#nt:braced-init-list shows that intermixing them is not allowed. ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-12-14 20:16 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-12-14 20:06 [Bug c++/108114] New: Designated initialization of parent class results in error in C++20 mode gawain.bolton at free dot fr 2022-12-14 20:14 ` [Bug c++/108114] " pinskia at gcc dot gnu.org 2022-12-14 20:16 ` pinskia at gcc dot gnu.org
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