Clang 7.0.0 release has a known bug https://bugs.llvm.org/show_bug.cgi?id=36384, thus 7.0.0 is unstable release for Linux and Windows. Last stable and tested LLVM+Clang release is 6.0.1. [ROCm/clr commit: 5ab9c4bbca]
5ab9c4bbca