使用OpenMP构建LLVM / Clang时与OpenMP和C ++相关的错误

I'm trying to compile LLVM, Clang, OpenMP (from the LLVM project) and libc++ (libcxx) from source on Fedora 25. The default GCC 6.3 is being to used to build them. I issueI'm trying to compile LLVM, Clang, OpenMP (from