使用Ninja编译llvm
参考:https://blog.csdn.net/dreammeard/article/details/19490449
https://stackoverflow.com/questions/40042533/how-to-enable-debug-only-in-llvm-build-with-cmake
https://llvm.org/docs/CMake.html
第一步 安装ninja和cmake1 获取并编译安装 ninja
$ git clone git://github.co
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