https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71205
Bug ID: 71205
Summary: c++14 wrong constructor resolution
Product: gcc
Version: 6.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: dushistov at mail dot ru
Target Milestone: ---
#include <initializer_list>
#include <iostream>
#define SHOW std::cout << __PRETTY_FUNCTION__ << "\n"
struct Foo {
Foo() { SHOW; }
Foo(const Foo &) { SHOW; }
Foo(Foo &&) { SHOW; }
Foo(std::initializer_list<Foo>) { SHOW; }
};
int main() {
Foo b;
Foo x = Foo { b };
}
accroding to
http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1467
and
http://en.cppreference.com/w/cpp/language/list_initialization
If T is a class type and the initializer list has a single element of the same
or derived type (possibly cv-qualified), the object is initialized from that
element (by copy-initialization for copy-list-initialization, or by
direct-initialization for direct-list-initialization).
This code should print:
Foo::Foo()
Foo::Foo(const Foo &)
clang (3.8.0) and mvsc++ print lines above, but
gcc (5.2, 6.1.1) print (g++ -std=c++14 -pedantic test.cpp):
Foo::Foo()
Foo::Foo(const Foo&)
Foo::Foo(std::initializer_list<Foo>)
which is wrong
