problem with namespaces

[John Hunter]

I doubt this is a bug, more likely my own lack of understanding of how
to use namespaces within gdb, but this seemed to be the closest forum
to ask such a question.  If their is a better forum, please advise.

In the code below, I cannot access the value of Ndim while debugging
in main.

Here is the code and the gdb session.

#include <iostream>
#include <cstddef>

namespace PDQ {
  void init();
  size_t Ndim;
}

void 
PDQ::init () {
  Ndim = 2;
}

int main() {
  using namespace PDQ;

  init();
  
  cout << "almost done; Ndim is " << Ndim <<  endl;
}

GDB session; code is compiled with g++ -g using gcc-2.95.2

Breakpoint 1, main () at namespace_gdb.cpp:17
(gdb) n
(gdb) p Ndim
No symbol "Ndim" in current context.
(gdb) p PDQ::Ndim
No symbol "PDQ" in current context.
(gdb) n
almost done; Ndim is 2
(gdb) show version
GNU gdb 4.18