This must be platform dependant because on my linux box with g++ 3.2. I get to link and execute.

John M. Dlugosz. Are you sure of what you say? Sorry about the off topic. ==toto.h

class A {
  int ma;

  void printit();

  A::A() : ma(666) {}
};
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==toto1.cc

#include "iostream"
#define class struct
#include "toto.h"

main() {
  A a;
  std::cerr << a.ma << "\n";
  a.printit();
}
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==toto2.cc

#include "iostream"
#include "toto.h"

void
A::printit() {
  std::cerr << ma << "\n";
}
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===Compilation, link, execution

$ g++ -c toto1.cc -o toto1.o
$ g++ -c toto2.cc -o toto2.o
In file included from toto2.cc:2:
toto.h:1: warning: all member functions in class `A' are private
$ g++ toto*.o -o a.out
$ ./a.out
666
666
$
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