/in/foo.cc:51:22: error: '_TCHAR' has not been declared
 int _tmain(int argc, _TCHAR* argv[])
                      ^~~~~~
/in/foo.cc: In function 'int _tmain(int, int**)':
/in/foo.cc:66:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^