C++成员函数前加类型，在g++下的编译错误，在vs2012下编译通过，什么原因

abc.cpp
#include
using namespace std;
class MY
{
public:
void MY::print()
{
cout<<"sdjflsdj"<<endl;
}

};
int _tmain(int argc, _TCHAR* argv[])
{
MY my;

my.print();

return 0;

}
g++ abc.cpp
abc.cpp:9: error: extra qualification ‘MY::’ on member ‘print’
去掉MY::编译通过