https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78274
Bug ID: 78274
Summary: Rejected specialization in different namespace
Product: gcc
Version: 6.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jakub at gcc dot gnu.org
Target Milestone: ---
I've noticed that clang++ accepts, but g++ rejects:
namespace std { template<typename T> struct tuple_size; }
struct A { int x, y, z; };
template<> struct std::tuple_size<A> { static const int value = 3; };
constexpr int a = std::tuple_size<A>::value;
test.C:3:24: error: specialization of ‘template<class T> struct
std::tuple_size’ in different namespace [-fpermissive]
template<> struct std::tuple_size<A> { static const int value = 3; };
^~~~~~~~~~~~~
test.C:1:45: error: from definition of ‘template<class T> struct
std::tuple_size’ [-fpermissive]
namespace std { template<typename T> struct tuple_size; }
^~~~~~~~~~
Is that a g++ or clang++ bug?
