"Linker option unused" build failure(s) — clang 9.0.1

PackageVersionSupposed error messageFull log Bug report
elpa 2016.05.001-6clang: error: src/mod_precision.f90: 'compiler' input unused in cpp mode [-Werror,-Wunused-command-line-argument] Log
frozen-bubble 2.212-9clang: error: -lglib-2.0: 'linker' input unused [-Werror,-Wunused-command-line-argument] Log
libkiwix 3.1.1-1clang: error: -Wl,--start-group: 'linker' input unused [-Werror,-Wunused-command-line-argument] Log

3 errors