[Bug c++/63705] New: [4.8/4.9/5 Regression] function template specialization outside namespace rejected with C++11

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63705

            Bug ID: 63705
           Summary: [4.8/4.9/5 Regression] function template
                    specialization outside namespace rejected with C++11
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org

Please consider:

markus@x4 ~ % cat te.ii
namespace N
{
template <typename T1>
void
f (const T1) {}
}

template <>
void
N::f (const int) {}

markus@x4 ~ % clang++ -std=c++11 -c te.ii
markus@x4 ~ % icpc -std=c++11 -c te.ii
markus@x4 ~ % g++ -std=c++11 -c te.ii
te.ii:10:16: error: specialization of ‘template<class T1> void N::f(T1)’ in
different namespace [-fpermissive]
 N::f (const int) {}
                ^
te.ii:5:1: error:   from definition of ‘template<class T1> void N::f(T1)’
[-fpermissive]
 f (const T1) {}
 ^

markus@x4 ~ % clang++ -c te.ii
te.ii:10:4: warning: first declaration of function template specialization of
'f' outside namespace 'N' is a C++11 extension [-Wc++11-extensions]
N::f (const int) {}
   ^
te.ii:5:1: note: explicitly specialized declaration is here
f (const T1) {}