我试图在Fedora 25上编译来自源代码的LLVM，Clang，OpenMP（来自LLVM项目）和libc ++（libcxx）。默认的GCC 6.3用于构建它们。我发出
cmake ../llvm -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD="X86"
在我得到
之前，一切似乎都很顺利-- 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
似乎有两个错误--1个与OpenMP相关（与LIBOMPTARGET_DEP_LIBELF和LIBOMPTARGET_DEP_LIBFFI相关），1个与C ++相关（CXX_SUPPORTS_NO_NESTED_ANON_TYPES_FLAG - Failed）。我不知道它们中的任何一个意味着什么，但我希望能够至少在多核CPU上使用OpenMP，我绝对希望能够编译C ++源文件。那么我应该如何关注这些错误呢？如果它们非常重要，那么有关该怎么做的任何提示？
更新：当我尝试构建它时，我在libcxx中获得了几个未定义的引用。
答案 0 :(得分：0)
对于与OpenMP相关的错误，我认为您需要在系统上安装libelf和libffi。