参考链接如下：
https://www.cnblogs.com/alog9/p/12097471.html
1 [root@localhost yum.repos.d]# yum list |grep llvm 2 devtoolset-7-llvm.x86_64 7.0-5.el7 centos-sclo-rh 3 holland-mysqllvm.noarch 1.1.20-1.el7 epel 4 llvm.x86_64 3.4.2-9.el7 epel 5 llvm-devel.x86_64 3.4.2-9.el7 epel 6 llvm-doc.noarch 3.4.2-9.el7 epel 7 llvm-libs.x86_64 3.4.2-9.el7 epel 8 llvm-ocaml.x86_64 3.4.2-9.el7 epel 9 llvm-ocaml-devel.x86_64 3.4.2-9.el7 epel 10 llvm-ocaml-doc.noarch 3.4.2-9.el7 epel 11 llvm-private.i686 7.0.1-1.el7 base 12 llvm-private.x86_64 7.0.1-1.el7 base 13 llvm-private-devel.i686 7.0.1-1.el7 base 14 llvm-private-devel.x86_64 7.0.1-1.el7 base 15 llvm-static.x86_64 3.4.2-9.el7 epel 16 llvm-toolset-7.x86_64 5.0.1-4.el7 centos-sclo-rh 17 llvm-toolset-7-build.x86_64 5.0.1-4.el7 centos-sclo-rh 18 llvm-toolset-7-clang.x86_64 5.0.1-4.el7 centos-sclo-rh 19 llvm-toolset-7-clang-analyzer.noarch 5.0.1-4.el7 centos-sclo-rh 20 llvm-toolset-7-clang-devel.x86_64 5.0.1-4.el7 centos-sclo-rh 21 llvm-toolset-7-clang-libs.x86_64 5.0.1-4.el7 centos-sclo-rh 22 llvm-toolset-7-clang-tools-extra.x86_64 5.0.1-4.el7 centos-sclo-rh 23 llvm-toolset-7-cmake.x86_64 3.6.2-9.el7 centos-sclo-rh 24 llvm-toolset-7-cmake-data.noarch 3.6.2-9.el7 centos-sclo-rh 25 llvm-toolset-7-cmake-doc.noarch 3.6.2-9.el7 centos-sclo-rh 26 llvm-toolset-7-compiler-rt.x86_64 5.0.1-2.el7 centos-sclo-rh 27 llvm-toolset-7-dockerfiles.x86_64 4.0.1-2.el7 centos-sclo-rh 28 llvm-toolset-7-git-clang-format.x86_64 5.0.1-4.el7 centos-sclo-rh 29 llvm-toolset-7-libomp.x86_64 5.0.1-2.el7 centos-sclo-rh 30 llvm-toolset-7-libomp-devel.x86_64 5.0.1-2.el7 centos-sclo-rh 31 llvm-toolset-7-lldb.x86_64 5.0.1-4.el7 centos-sclo-rh 32 llvm-toolset-7-lldb-devel.x86_64 5.0.1-4.el7 centos-sclo-rh 33 llvm-toolset-7-llvm.x86_64 5.0.1-8.el7 centos-sclo-rh 34 llvm-toolset-7-llvm-devel.x86_64 5.0.1-8.el7 centos-sclo-rh 35 llvm-toolset-7-llvm-doc.noarch 5.0.1-8.el7 centos-sclo-rh 36 llvm-toolset-7-llvm-libs.x86_64 5.0.1-8.el7 centos-sclo-rh 37 llvm-toolset-7-llvm-static.x86_64 5.0.1-8.el7 centos-sclo-rh 38 llvm-toolset-7-python-lldb.x86_64 5.0.1-4.el7 centos-sclo-rh 39 llvm-toolset-7-python2-lit.noarch 0.5.1-1.el7 centos-sclo-rh 40 llvm-toolset-7-runtime.x86_64 5.0.1-4.el7 centos-sclo-rh 41 llvm-toolset-7.0.x86_64 7.0.1-2.el7 centos-sclo-rh 42 llvm-toolset-7.0-build.x86_64 7.0.1-2.el7 centos-sclo-rh 43 llvm-toolset-7.0-clang.x86_64 7.0.1-1.el7 centos-sclo-rh 44 llvm-toolset-7.0-clang-analyzer.noarch 7.0.1-1.el7 centos-sclo-rh 45 llvm-toolset-7.0-clang-devel.x86_64 7.0.1-1.el7 centos-sclo-rh 46 llvm-toolset-7.0-clang-libs.x86_64 7.0.1-1.el7 centos-sclo-rh 47 llvm-toolset-7.0-clang-tools-extra.x86_64 7.0.1-1.el7 centos-sclo-rh 48 llvm-toolset-7.0-cmake.x86_64 3.6.2-11.el7 centos-sclo-rh 49 llvm-toolset-7.0-cmake-data.noarch 3.6.2-11.el7 centos-sclo-rh 50 llvm-toolset-7.0-cmake-doc.noarch 3.6.2-11.el7 centos-sclo-rh 51 llvm-toolset-7.0-compiler-rt.x86_64 7.0.1-3.el7 centos-sclo-rh 52 llvm-toolset-7.0-git-clang-format.x86_64 7.0.1-1.el7 centos-sclo-rh 53 llvm-toolset-7.0-libomp.x86_64 7.0.1-2.el7 centos-sclo-rh 54 llvm-toolset-7.0-libomp-devel.x86_64 7.0.1-2.el7 centos-sclo-rh 55 llvm-toolset-7.0-libomp-test.x86_64 7.0.1-2.el7 centos-sclo-rh 56 llvm-toolset-7.0-lld.x86_64 7.0.1-2.el7 centos-sclo-rh 57 llvm-toolset-7.0-lld-devel.x86_64 7.0.1-2.el7 centos-sclo-rh 58 llvm-toolset-7.0-lld-libs.x86_64 7.0.1-2.el7 centos-sclo-rh 59 llvm-toolset-7.0-lldb.x86_64 7.0.1-1.el7 centos-sclo-rh 60 llvm-toolset-7.0-lldb-devel.x86_64 7.0.1-1.el7 centos-sclo-rh 61 llvm-toolset-7.0-llvm.x86_64 7.0.1-4.el7 centos-sclo-rh 62 llvm-toolset-7.0-llvm-devel.x86_64 7.0.1-4.el7 centos-sclo-rh 63 llvm-toolset-7.0-llvm-doc.noarch 7.0.1-4.el7 centos-sclo-rh 64 llvm-toolset-7.0-llvm-googletest.x86_64 7.0.1-4.el7 centos-sclo-rh 65 llvm-toolset-7.0-llvm-libs.x86_64 7.0.1-4.el7 centos-sclo-rh 66 llvm-toolset-7.0-llvm-static.x86_64 7.0.1-4.el7 centos-sclo-rh 67 llvm-toolset-7.0-python-lldb.x86_64 7.0.1-1.el7 centos-sclo-rh 68 llvm-toolset-7.0-python2-lit.noarch 0.7.1-1.el7 centos-sclo-rh 69 llvm-toolset-7.0-runtime.x86_64 7.0.1-2.el7 centos-sclo-rh 70 llvm3.9.x86_64 3.9.1-7.el7 epel 71 llvm3.9-devel.x86_64 3.9.1-7.el7 epel 72 llvm3.9-libs.x86_64 3.9.1-7.el7 epel 73 llvm3.9-static.x86_64 3.9.1-7.el7 epel 74 llvm5.0.x86_64 5.0.1-7.el7 epel 75 llvm5.0-devel.x86_64 5.0.1-7.el7 epel 76 llvm5.0-doc.noarch 5.0.1-7.el7 epel 77 llvm5.0-libs.x86_64 5.0.1-7.el7 epel 78 llvm5.0-static.x86_64 5.0.1-7.el7 epel 79 llvm7.0.x86_64 7.0.1-4.el7 epel 80 llvm7.0-devel.x86_64 7.0.1-4.el7 epel 81 llvm7.0-doc.noarch 7.0.1-4.el7 epel 82 llvm7.0-libs.x86_64 7.0.1-4.el7 epel 83 llvm7.0-static.x86_64 7.0.1-4.el7 epel 84 mesa-private-llvm.i686 3.9.1-3.el7 base 85 mesa-private-llvm.x86_64 3.9.1-3.el7 base 86 mesa-private-llvm-devel.i686 3.9.1-3.el7 base 87 mesa-private-llvm-devel.x86_64 3.9.1-3.el7 base 88 rh-eclipse46-eclipse-cdt-llvm.x86_64 1:9.2.1-2.1.el7 centos-sclo-rh 89 [root@localhost yum.repos.d]#
安装如下两个包就可以使用clang编译器了。
1 yum install llvm-toolset-7.0-clang.x86_64 llvm-toolset-7.0-llvm-libs.x86_64 2 ldconfig