"Argument unused caused failure" build failure(s) — clang 3.4

Unknown or unused arguments triggers errors with -Werror:
clang -Werror -ggdb3 foo.c
PackageVersionSupposed error messageFull log Bug report
lebiniou 3.19.1-1clang: error: argument unused during compilation: '-e xport-dynamic' Log
libwebsockets 1.2.2-1clang: error: argument unused during compilation: '-rdynamic' Log
lio-utils 3.1+git2.fd0b34fd-2clang: error: argument unused during compilation: '-shared' Log
policycoreutils 2.2.5-1clang: error: argument unused during compilation: '-shared' Log
spice-vdagent 0.15.0-1clang: error: argument unused during compilation: '-Wp,-D_FORTIFY_SOURCE=2' Log

5 errors