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.
