[Bug c++/60551] __attribute__((used)) is ignored for 'static' function declarations

[slyfox at inbox dot ru]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60551

--- Comment #1 from Sergei Trofimovich <slyfox at inbox dot ru> ---
Clarification: 'a.cc' should be named as 'a.hh' as it's a header included in
many other .cc files.