https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70431
Bug ID: 70431
Summary: [C++11] Out of line defaulted copy constructor of a
union does not compile.
Product: gcc
Version: 5.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vmpstr at chromium dot org
Target Milestone: ---
Given:
union Foo {
Foo() = default;
Foo(const Foo& other);
int a;
float b;
};
Foo::Foo(const Foo& other) = default;
I get the following compilation error:
$ g++ -std=c++11 -c foo.cpp
foo.cpp: In copy constructor ‘Foo::Foo(const Foo&)’:
foo.cpp:1:7: error: initializations for multiple members of ‘Foo’
union Foo {
^
foo.cpp: At global scope:
foo.cpp:9:30: note: synthesized method ‘Foo::Foo(const Foo&)’ first required
here
Foo::Foo(const Foo& other) = default;
^
$ g++ --version
g++ (GCC) 5.3.0
The expected behavior is that this would compile. Note that if the constructor
is inline, then it compiles as expected.
