https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67650
--- Comment #35 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #34)
> __attribute__((weak)) void f() { }
This is here so that I() { f(); } doesn't get inlined (because the compiler
can't know what f() does, since it might get replaced during linking). Without
a call to some non-inlinable function it links OK. For the version in comment
29 the std::string constructor and destructor served that purpose, because
they're defined in libstdc++.so and not inlined.
