Yes, but global variables are not necessarily static.
C++ has to run code before main if a ctor is in a class that's static. There's no other way to initialize that static object.
C prevents this by requiring static storage to be initialized with constants.
namespace {
int myfunc() {
return 5;
}
int x;
int y = 4;
int z = myfunc();
};
int main()
{}