拾遗：YouCompleteMe 前传——编译安装 llvm + clang

http://llvm.org/docs/GettingStarted.html

一、下载安装 cmake >=3.4.3

yum install gcc gcc-c++
curl -O http://www.cmake.org/files/v3.9/cmake-3.9.2.tar.gz
## git clone https://github.com/Kitware/CMake.git ##cmake 官网下载会很慢，可以考虑从 gitbub 上拉取源码
export PATH=$PATH:/opt/cmake/bin

tar -xf cmake-3.9.2.tar.gz
cd cmake-3.9.2    
./bootstrap --prefix=/opt/cmake
make && make install 

二、下载 llvm 源码(可选，YCM 会自动下载通用库)

cd /tmp
for x in "http://releases.llvm.org/4.0.0/llvm-4.0.0.src.tar.xz
    http://releases.llvm.org/4.0.0/cfe-4.0.0.src.tar.xz
    http://releases.llvm.org/4.0.0/compiler-rt-4.0.0.src.tar.xz
    http://releases.llvm.org/4.0.0/clang-tools-extra-4.0.0.src.tar.xz
    http://releases.llvm.org/4.0.0/libcxx-4.0.0.src.tar.xz
    http://releases.llvm.org/4.0.0/libcxxabi-4.0.0.src.tar.xz"; do
    wget $x
done

cd $HOME
mkdir llvm_source && cd llvm_source
tar -xf /tmp/llvm-4.0.0.src.tar.xz
mv llvm-4.0.0.src llvm

cd llvm/tools
tar -xf /tmp/cfe-4.0.0.src.tar.xz
mv cfe-4.0.0.src clang

cd clang/tools
tar -xf /tmp/clang-tools-extra-4.0.0.src.tar.xz
mv clang-tools-extra-4.0.0.src clang-tools-extra

cd ../../../projects
tar -xf /tmp/compiler-rt-4.0.0.src.tar.xz
mv compiler-rt-4.0.0.src compiler-rt
tar -xf /tmp/libcxx-4.0.0.src.tar.xz
mv libcxx-4.0.0.src libcxx
tar -xf /tmp/libcxxabi-4.0.0.src.tar.xz
mv libcxxabi-4.0.0.src libcxxabi

三、编译／安装

mkdir llvm_build && cd llvm_build

cmake -G "Unix Makefiles" 
-D CMAKE_BUILD_TYPE=Release 
-D LLVM_TARGETS_TO_BUILD=host 
-D CMAKE_INSTALL_PREFIX=/opt/llvm 
. 
../llvm

make && make install

tips:

CentOS 6 升级 gcc-4.8

https://www.cnblogs.com/imzye/p/6216482.html