https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66476
Bug ID: 66476
Summary: Erroneous initializer_list lifetime extension from
temporary initializer_list
Product: gcc
Version: 5.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ed at catmur dot co.uk
Target Milestone: ---
#include <stdio.h>
#include <initializer_list>
struct S { S(int) { puts("S(int)"); } ~S() { puts("~S()"); } };
int main() {
std::initializer_list<S> ss({42}); // note extra parentheses
puts("main");
}
Expected output (clang 3.7, MSVC 18.00.21005.1):
S(int)
~S()
main
Observed output (gcc 5.1.0):
S(int)
main
~S()
The same behaviour is observed when the temporary initializer_list is made
explicit:
std::initializer_list<S> ss = std::initializer_list<S>{42};
Again, gcc lifetime-extends the backing array; MSVC and clang do not.
