Can’t compile template class declared in namespace defined outside namespace

[Mazdaywik]

If template class declared in namespace, but defined outside namespace, Open Watcom can’t compile it. For example:

namespace ns {

  // declaration of class
  template <typename T>
  class Templ;

}

// definition of class
template <typename T>
class ns::Templ {
public:
  T value;
};

ns::Templ<int> x;

int f() {
  return ++x.value;
}

Open Watcom C/C++ CL Clone for 386
Version 2.0 beta Apr  2 2015 11:27:33 (32-bit)
… copyrights …
test-don’t-work.cpp
test-don’t-work.cpp(11): Error! E121: col(17) syntax error
test-don’t-work.cpp(16): Error! E326: col(17) defining 'x' is not possible because its type has unknown size
test-don’t-work.cpp(16): Note! N392: col(16) definition: 'ns::Templ<int> x'
test-don’t-work.cpp(19): Error! E516: col(12) class for object is not defined
test-don’t-work.cpp(19): Note! N638: col(12) 'Templ' defined in: test-don’t-work.cpp(5) (col 9)
test-don’t-work.cpp(19): Note! N638: col(12) 'Templ' defined in: test-don’t-work.cpp(5) (col 9)

This code is successfully compiled by BCC 5.5, Visual C++ 18.00.40629, GCC (g++) 4.8.1, CLang 3.7.0.

test-don’t-work.cpp test-don’t-work.err

[jmalak]

Thanks for your bug report. OW C++ compiler need to improve support for name spaces and templates.