添加llvm软件源
到llvm官网可以查看各个版本linux的源地址，官网地址https://apt.llvm.org/。以下是ubuntu18.04和ubuntu20.04这两个主流版本的llvm软件源地址：
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deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic main
deb-src http://apt.llvm.org/bionic/ llvm-toolchain-bionic main
# Needs 'sudo add-apt-repository ppa:ubuntu-toolchain-r/test' for libstdc++ with C++20 support
# 12
deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-12 main
deb-src http://apt.llvm.org/bionic/ llvm-toolchain-bionic-12 main
# 13
deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-13 main
deb-src http://apt.llvm.org/bionic/ llvm-toolchain-bionic-13 main
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deb http://apt.llvm.org/focal/ llvm-toolchain-focal main
deb-src http://apt.llvm.org/focal/ llvm-toolchain-focal main
# 12
deb http://apt.llvm.org/focal/ llvm-toolchain-focal-12 main
deb-src http://apt.llvm.org/focal/ llvm-toolchain-focal-12 main
# 13
deb http://apt.llvm.org/focal/ llvm-toolchain-focal-13 main
deb-src http://apt.llvm.org/focal/ llvm-toolchain-focal-13 main
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ubuntu系统软件源列表通常保存在/etc/apt/sources.list文件中，打开该文件在其末尾添加以上内容。推荐新建list文件的做法，参考google-chrome的做法，在
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/etc/apt/sources.list.d/
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新增单独的list文件，可以新建一个clang.list文件单独存放llvm的软件源地址，这样可以保持系统软件源地址与默认一致。
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sudo vim /etc/apt/sources.list.d/
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安装
完成软件源添加后，打开终端执行以下命令更新可用软件源地址
执行安装，以下命令会默认安装最新稳定版clang
或者按照完整的llvm工具链
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sudo apt-get install clang-format clang-tidy clang-tools clang clangd libc++-dev libc++1 libc++abi-dev libc++abi1 libclang-dev libclang1 liblldb-dev libllvm-ocaml-dev libomp-dev libomp5 lld lldb llvm-dev llvm-runtime llvm python-clang
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等等安装完成，查看clang版本
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clang -v
Ubuntu clang version 14.0.0-++20211221052852+55c71c9eac9b-1~exp1~20211221172954.95
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/9
Candidate multilib: .;@m64
Selected multilib: .;@m64
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