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我想在Fedora 25上从源代码编译LLVM，Clang，OpenMP（来自LLVM项目）和libC++（libcxx）。默认GCC 6.3正在用于构建它们。我发出使用OpenMP构建LLVM/Clang时与OpenMP和C++相关的错误
cmake ../llvm -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD="X86"
一切似乎顺利，直到我得到
-- Performing Test LIBOMPTARGET_HAVE_STD_CPP11_FLAG
-- Performing Test LIBOMPTARGET_HAVE_STD_CPP11_FLAG - Success
-- Performing Test LIBOMPTARGET_HAVE_WERROR_FLAG
-- Performing Test LIBOMPTARGET_HAVE_WERROR_FLAG - Success
-- Could NOT find LIBOMPTARGET_DEP_LIBELF (missing: LIBOMPTARGET_DEP_LIBELF_LIBRARIES LIBOMPTARGET_DEP_LIBELF_INCLUDE_DIRS)
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.1")
-- Could NOT find LIBOMPTARGET_DEP_LIBFFI (missing: LIBOMPTARGET_DEP_LIBFFI_LIBRARIES LIBOMPTARGET_DEP_LIBFFI_INCLUDE_DIRS)
-- LIBOMPTARGET: Building offloading runtime library libomptarget.
-- LIBOMPTARGET: Not building aarch64 offloading plugin: machine not found in the system.
-- LIBOMPTARGET: Not building CUDA offloading plugin: libelf dependency not found.
-- LIBOMPTARGET: Not building PPC64 offloading plugin: machine not found in the system.
-- LIBOMPTARGET: Not building PPC64le offloading plugin: machine not found in the system.
-- LIBOMPTARGET: Not building x86_64 offloading plugin: libelf dependency not found.
-- Found Z3: /usr/lib64/libz3.so (found suitable version "4.5.0 - 64 bit - build hashcode d57a2a6dce92", minimum required is "4.5")
-- Looking for sys/resource.h
-- Looking for sys/resource.h - found
-- Clang version: 5.0.0
-- Performing Test CXX_SUPPORTS_NO_NESTED_ANON_TYPES_FLAG
-- Performing Test CXX_SUPPORTS_NO_NESTED_ANON_TYPES_FLAG - Failed
-- Configuring done
-- Generating done
似乎有两个误区 - 1相关的OpenMP（与LIBOMPTARGET_DEP_LIBELF和LIBOMPTARGET_DEP_LIBFFI）和1与C++（CXX_SUPPORTS_NO_NESTED_ANON_TYPES_FLAG - Failed） 。我真的不知道它们是什么意思，但我希望能够至少在多核CPU上使用OpenMP，并且我肯定希望能够编译C++源文件。那么我应该如何关心这些错误呢？如果它们很重要，那么在这里做什么暗示？
更新：当我尝试构建它时，我在libcxx中得到了几个未定义的引用。