https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93607
Bug ID: 93607
Summary: Deprecated alias templates don't produce warnings
Product: gcc
Version: 9.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: tim.pavlic at minelab dot com.au
Target Milestone: ---
Source I'm testing with:
-------------------------
#include <type_traits>
template <typename T>
struct identity
{
using type = T;
};
template <typename T>
using Identity [[deprecated]] = identity<T>;
void x()
{
// No deprecated warnings here
using Int = typename Identity<int>::type;
static_assert(std::is_same<typename identity<int>::type, typename
Identity<int>::type>::value, "");
// No deprecated warning
Int i = 0;
// No deprecated warning
typename Identity<int>::type j = 0;
}
-----
I would have thought that all (or most) of the scenarios above would have
generated deprecation warnings, but none of them do.
Does the standard say that alias templates are exempt from [[deprecated]]?
I've tried this on godbolt.org with versions of GCC back to 4.9, and none of
them produce warnings.
