[Bug c/59749] unused warning not emited for unused static struct unles -save-temps is used

[martin at netbsd dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59749

--- Comment #4 from Martin Husemann <martin at netbsd dot org> ---
Yes - I'm still trying to reduce it to a reasonable test case, but in general
it works - so I am confused big time.
Also Julio (the ATF author) claims the same test works on FreeBSD with a very
similar compiler version.