Order of initialization of globals across TU

Whereas inside a Translation Unit, order of initialization of global variables is specified, order of initialization across Translation Units is unspecified.

So program with following files

• foo.cpp

#include <iostream>

int dummyFoo = ((std::cout << "foo"), 0);

• bar.cpp

#include <iostream>

int dummyBar = ((std::cout << "bar"), 0);

• main.cpp

int main() {}

might produce as output:

foobar

or

barfoo

That may lead to Static Initialization Order Fiasco.