"Unused function" build failure(s) — clang 3.5.0

-Wall -Werror are including the option -Wunused-function. Without not the case with g++
namespace { 
   void dummy_for_semicolon_do_not_use();
}
PackageVersionSupposed error messageFull log Bug report
cdebootstrap 0.6.3../../../../src/frontend/standalone/message.c:76:12: error: unused function 'unused' [-Werror,-Wunused-function] Log 751630
diskscan 0.14.1-5src/cdb.c:35:20: error: unused function 'set_uint64' [-Werror,-Wunused-function] Log

2 errors