instan1.c

gcc-you can use this code to learn something about gcc, and inquire further into linux,

// Build don't run:
// Origin: Mark Mitchell <[e-mail]>
// Special g++ Options: -fno-implicit-templates

template <class T>
struct U {
  static int j;
};

template <class T>
struct S {
  static const int i = 7;
};

template <class T>
const int S<T>::i;

template <class T>
int U<T>::j = S<T>::i + 5;

template int U<double>::j;

int main () {
}