C++ global object init priority

init.cpp

#include <iostream>
struct A {
  A() { std::cout << "A\n"; }
};
struct B {
  B() { std::cout << "B\n"; }
};

// Init priority adjustment so A is inialized later.
A __attribute__ ((init_priority (250))) a; // 150 vs 250 flip the order
B __attribute__ ((init_priority (200))) b;

int main() {}