C function defined as int but having no return statement in the body still compiles

Question

Say you have a C code like this:

#include 

int main(){
    printf("Hello, world!\\n");
    printf("%d\\n", f());    
}

in         


        

Answer 1

I compile with -Werror=return-type to prevent this. GCC will give an error if you don't return from a function (unless it's void return).