"Optimization flag is not supported" build failure(s) — clang 5.0

PackageVersionSupposed error messageFull log Bug report
libi8x 0.0.3-1clang: error: optimization flag '-fno-gcse' is not supported [-Werror,-Wignored-optimization-argument] Log
pesign 0.112-4clang: error: optimization flag '-fno-merge-constants' is not supported [-Werror,-Wignored-optimization-argument] Log
upx-ucl 3.94-2clang: error: optimization flag '-fno-delete-null-pointer-checks' is not supported [-Werror,-Wignored-optimization-argument] Log

3 errors