https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106150
Bug ID: 106150
Summary: Incorrect error for defaulted anonymous union member
Product: gcc
Version: 12.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jens.maurer at gmx dot net
Target Milestone: ---
The following is valid, but yields an error with gcc 12.1:
struct A {
A() { }
};
struct V {
V() { };
~V() { }
};
struct S {
S();
~S() {}
union {
A a = {};
V v;
};
};
S::S() = default;
x.cc:22:1: note: ‘S::S()’ is implicitly deleted because the default definition
would be ill-formed:
22 | S::S() = default;
| ^
x.cc:18:8: error: union member ‘S::<unnamed union>::v’ with non-trivial
‘V::V()’
18 | V v;
| ^
Replacing "= default" with "{}" makes the error go away.
None of the items in [class.default.ctor] p2 applies, in particular p2.2 does
not apply because S::a has a default member initializer.
