[Bug c++/60702] thread_local initialization

[dv.main at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60702

--- Comment #3 from Stan Pavlovski <dv.main at gmail dot com> ---
Template class' thread_local member is not initialized unless other
non-template class' thread_local member is initialized first:

#include <iostream>

using namespace std;

struct far {
    struct boo {
        boo () {
            cerr << "far::boo" << endl;
        }
        int i = 42;
    };

    static void baz() {
        cerr << far::FOO.i << endl;
    }

    static thread_local boo FOO;
};

template<class T>
struct bar {
    struct foo {
        foo () {
            cerr << "bar::foo" << endl;
        }
        int i = 42;
    };

    void baz() {
        cerr << bar::FOO.i << endl;
    }

    static thread_local foo FOO;
};

template<class T> thread_local typename bar<T>::foo bar<T>::FOO;
thread_local typename far::boo far::FOO;

int main() {
    bar<int> b;
    b.baz();

    far f;
    f.baz();
    return 0;
}

Output:

0
far::boo
bar::foo
42