llvm安装

安装相应依赖

sudo apt-get install -y libc6-dev binutils libgcc-{version}-dev build-essential make cmake git python2.7 python3-distutils

注：libgcc-{version}-dev中的version就是gcc的版本，如果是9.x.x就是9.

安装

1. 下载整个压缩包，我这里使用的是 github

2. 建立src和work文件夹，命令是

   mkdir -p $WORK_DIR/src
   mkdir -p $WORK_DIR/work/llvm
   

3. 将刚才的压缩包解压到src文件夹下

4. 进入到work/llvm文件夹下，进行cmake操作

   # 命令规范：cmake -G <generator> [options] ../llvm
   cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DLIBCXX_ENABLE_SHARED=OFF -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON -DLLVM_TARGETS_TO_BUILD="X86" {../llvm文件路径} -DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi;compiler-rt;clang-tools-extra;openmp;lldb;lld"
   # 注：{../llvm文件路径}这是llvm所在的文件路径，如果按照顺序走下来，这个地方应该是../../src/llvm-x.x.x/llvm
   

5. 利用刚才的命令，在work/llvm文件夹下已经制作好了makefile，此时执行以下命令：

   make -j$(nproc)
   注：-j命令是多核编译，有助于加快速度
   

其它参考资料

Some common build system generators are:

• Ninja — for generating Ninja build files. Most llvm developers use Ninja.

• Unix Makefiles — for generating make-compatible parallel makefiles.

• Visual Studio — for generating Visual Studio projects and solutions.

• Xcode — for generating Xcode projects.

• 这里使用Unix Makefiles

• -DLLVM_ENABLE_PROJECTS='...' — semicolon-separated list of the LLVM subprojects you’d like to additionally build. Can include any of: clang, clang-tools-extra, libcxx, libcxxabi, libunwind, lldb, compiler-rt, lld, polly, or debuginfo-tests.

  For example, to build LLVM, Clang, libcxx, and libcxxabi, use `-DLLVM_ENABLE_PROJECTS=“clang;libcxx;libcxxabi”

• -DCMAKE_INSTALL_PREFIX=directory — Specify for directory the full pathname of where you want the LLVM tools and libraries to be installed (default /usr/local).

• -DCMAKE_BUILD_TYPE=type — Valid options for type are Debug, Release, RelWithDebInfo, and MinSizeRel. Default is Debug.

• -DLLVM_ENABLE_ASSERTIONS=On — Compile with assertion checks enabled (default is Yes for Debug builds, No for all other build types).

• 例子：

  cmake -G “Unix Makefiles” -DCMAKE_BUILD_TYPE=Release –enable-optimized –enable-targets=host-only {../llvm文件路径} -DLLVM_ENABLE_PROJECTS=“clang;libcxx;libcxxabi;compiler-rt;clang-tools-extra;openmp;lldb;lld”

  -DLIBCXX_ENABLE_SHARED=OFF -DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=ON -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD=“X86”

报错：

• ModuleNotFoundError: No module named ‘distutils.spawn’：
  • sudo apt-get install python3-distutils