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build LLVM and clang on Linux

In order to build and contribute to ClickHouse, you must use LLVM and Clang. These are the commands to build the latest version of LLVM and Clang on Linux: 
git clone git@github.com:llvm/llvm-project.git
mkdir llvm-build
cd llvm-build
cmake -GNinja -DCMAKE_BUILD_TYPE:STRING=Release -DLLVM_ENABLE_PROJECTS=all -DLLVM_TARGETS_TO_BUILD=all ../llvm-project/llvm
time ninja
sudo ninja install