https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107124
Bug ID: 107124
Summary: Reference template parameter refers to a temporary
object
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fchelnokov at gmail dot com
Target Milestone: ---
The following program is accepted by Clang:
template<int>
struct A {};
template<const int & I>
constexpr int f(A<I>) { return 0; }
template<class T>
constexpr int f(T) { return 1; }
static_assert( f(A<0>{}) == 1 );
But in GCC static assertion fails, because f(A<I>) overload is preferred.
Online demo: https://gcc.godbolt.org/z/9hj4WoT7b
But this is illegal by http://eel.is/c++draft/temp.arg.nontype#3.1, since const
int & I cannot refer to a temporary int 0.
