llvm安装，find_package优先地址

注意的点
cmake -S llvm -B build -G “Ninja” -DCMAKE_BUILD_TYPE=Release
pwd换成了~
-DLLVM_INCLUDE_TESTS=OFF \记得加在第一条option

git clone --depth 1 https://github.com/llvm/llvm-project.git
cd llvm-project

cmake -S llvm -B build -G "Ninja" -DCMAKE_BUILD_TYPE=Release
build_llvm=~/build-llvm
build_clang=~/build-clang
installprefix=/usr/local/
llvm=~/llvm-project
mkdir -p $build_llvm
mkdir -p $installprefix

cmake -G Ninja -S $llvm/llvm -B $build_llvm \
      -DLLVM_INSTALL_UTILS=ON \
      -DCMAKE_INSTALL_PREFIX=$installprefix \
      -DCMAKE_BUILD_TYPE=Release
sudo ninja -C $build_llvm install

cmake -G Ninja -S $llvm/clang -B $build_clang \
      -DLLVM_INCLUDE_TESTS=OFF \
      -DLLVM_EXTERNAL_LIT=$build_llvm/utils/lit \
      -DLLVM_ROOT=$installprefix
ninja -C $build_clang

cmake -DCMAKE_PREFIX_PATH=/path/to/your/library ..

cmake -G Ninja ../llvm -DCMAKE_INSTALL_PREFIX=/home/wrf/llvm13 -DLLVM_PARALLEL_COMPILE_JOBS=7 -DLLVM_PARALLEL_LINK_JOBS=1 -DLLVM_BUILD_EXAMPLES=ON -DLLVM_TARGETS_TO_BUILD="X86" -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_CCACHE_BUILD=ON -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DLLVM_ENABLE_PROJECTS='clang;lldb;lld;mlir;clang-tools-extra;compiler-rt' -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DLLVM_ENABLE_LLD=ON


cmake -DCMAKE_INSTALL_PREFIX=/home/wrf/mlir-dir -P cmake_install.cmake

 -DCMAKE_PREFIX_PATH=/path/to/your/library    //指定find_package的地址