[Bug c++/49470] New: no matching constructor for initialization errors not detected in g++

["howarth at nitro dot med.uc.edu" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49470

           Summary: no matching constructor for initialization errors not
                    detected in g++
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: howarth@nitro.med.uc.edu


Currently g++ doesn't warn or error on invalid code such as...

template <class T> class Array1D {
  Array1D(int n, T *a);
};
template<typename T>
struct A {
  Array1D<int> x;
  A() : x(1, (const int*)0) {}
};

for which clang++ produces the error...

[MacPro:~] howarth% clang++ -c invalid.cc
invalid.cc:7:9: error: no matching constructor for initialization of
'Array1D<int>'
  A() : x(1, (const int*)0) {}
        ^ ~~~~~~~~~~~~~~~~
invalid.cc:2:3: note: candidate constructor not viable: 2nd argument ('const
int *') would lose const qualifier
  Array1D(int n, T *a);
  ^
invalid.cc:1:26: note: candidate constructor (the implicit copy constructor)
not viable: requires 1 argument, but 2 were provided
template <class T> class Array1D {
                         ^
1 error generated.