https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119032
Bug ID: 119032
Summary: Should using brace elison for designated initializer
be reminded under '-pedantic-errors'?
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Keywords: accepts-invalid, diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rush102333 at gmail dot com
Target Milestone: ---
An interesting question that has also been submitted to LLVM' s bug tracker:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
struct A {
int a;
};
struct B {
int b;
};
struct C {
A a;
B b;
};
C c{.a=0, .b={12}};
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GCC accepts this after gcc-11.3 and rejects it before by giving the following
diagnostic:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<source>:14:18: error: 'A' has no non-static data member named 'b'
14 | C c{.a=0, .b={12}};
| ^
Compiler returned: 1
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
https://godbolt.org/z/5nPzG3WGY
While the real question might be that the code uses brace elision inside a
designated initializer("{.a=0}"), which is actually a C99 extension, the
diagnostic seems not that accurate.
LLVM now ends up throwing a warning for that and erroring under
'-pedantic-errors', but GCC currently does not provide any diagnostic even
under '-pedantic-errors':
https://godbolt.org/z/4fdWWTKqr
