C99 and C++ standards don’t require functions to return a value. The missing return statement in a value-returning function will be defined (to return 0) only in the main function. The rationale includes that checking if every code path returns a value is quite difficult, and a return value could be set with embedded assembler … Read more
You need to actually define the static member somewhere (after the class definition). Try this: class Foo { /* … */ }; const int Foo::MEMBER; int main() { /* … */ } That should get rid of the undefined reference.
You can do it using shell with a sequence like <program>& pid=$! sleep $time_limit if ps aux | grep $pid | grep -v grep > /dev/null then kill $pid echo “Time limit exceeded” fi Here are two examples with and without reaching the time limit (using sleep 10 and sleep 3 as program, with a … Read more
You haven’t defined main() function in your program. As said in error: (.text+0x20): undefined reference to `main’ PS: This is not crash of g++, it just shows error message when can’t find definition of main().