Centos7 源碼安裝 Clang

安裝CMake 必須是3.4.3以上版本，直接下載二進制設置到PATH環境變量就可以了   安裝編譯依賴 yum install python-devel libffi-devel graphviz-devel elfutils-libelf-devel readline-devel libedit-devel libxml2-devel protobuf-devel gtext-devel do

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