"Unsupported argument with another option" build failure(s) — clang 3.8.1

PackageVersionSupposed error messageFull log Bug report
3dchess 0.8.1-19clang: error: unsupported option '-fpcc-struct-return' for target 'x86_64-pc-linux-gnu' Log
autodock-vina 1.1.2-3clang: error: unsupported option '--lto' Log
crawl 2:0.18.1-1clang: error: unsupported argument 'jobserver' to option 'flto=' Log
freecontact 1.0.21-4clang: error: unsupported option '--help=optimizers' Log
libffi 3.2.1-4clang: error: unsupported option '-print-multi-os-directory' Log
libre 0.4.17-3clang: error: unsupported option '--print-multiarch' Log
mlton 20100608-5.1clang: error: unsupported option '-gstabs+' Log
qtwebkit-opensource-src 5.6.1+dfsg-5clang: error: unsupported option '-gstabs' Log
stalin 0.11-6clang: error: unsupported option '-freg-struct-return' for target 'x86_64-pc-linux-gnu' Log
supermin 5.1.16-1clang: error: unsupported option '-specs /usr/lib/x86_64-linux-musl/musl-gcc.specs' Log
syslinux 3:6.03+dfsg-14clang: error: unsupported option '--print-libgcc' Log
systemd 231-5clang: error: unsupported option '-print-multi-os-directory' Log

12 errors