添加 编译问题记录

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+1. make install_cmake时apt源存在无效源，导致make退出，解决办法：删除无效源即可
+
+```
+sudo add-apt-repository --remove ppa:george-edison55/cmake-3.x
+
+sudo apt-get update
+```
+报错log：
+
+```
+
+Reading package lists... Done
+
+E: The repository 'http://ppa.launchpad.net/george-edison55/cmake-3.x/ubuntu focal Release' does not have a Release file.
+
+N: Updating from such a repository can't be done securely, and is therefore disabled by default.
+
+N: See apt-secure(8) manpage for repository creation and user configuration details.
+
+make[1]: *** [Makefile:2: all] Error 100
+
+make[1]: Leaving directory '/home/payton/hunting/tools/cmake'
+
+make: *** [Makefile:17: install_cmake] Error 2
+```
+
+2.github克隆仓库失败。主要是国内网络对GitHub不友好，直接使用全局代理即可下载。log如下：
+```
+payton@SER:~/hunting$ make compile_llvm
+
+make -C tools/clang-tidy all
+
+make[1]: Entering directory '/home/payton/hunting/tools/clang-tidy'
+
+llvm-project not exist
+
+Cloning into 'llvm-project'...
+
+fatal: unable to access 'https://github.com/llvm/llvm-project.git/': GnuTLS recv error (-54): Error in the pull function.
+
+/bin/sh: line 3: cd: llvm-project/: No such file or directory
+
+/bin/sh: line 4: cd: build: No such file or directory
+
+make[1]: *** [Makefile:2: all] Error 1
+
+make[1]: Leaving directory '/home/payton/hunting/tools/clang-tidy'
+
+make: *** [Makefile:20: compile_llvm] Error 2
+
+```
+