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//test.cpp
static int m = 10;
int *p = &m;
//main.cpp
#include<iostream>
extern int m;
extern int *p;
int main()
{
std::cout << m << std::endl;
std::cout << *p << std::endl;
return 0;
}
//I:\learn C++\Learn C++\main.cpp|6|undefined reference to `m'|