lhcc@LHC-UAV:~/formation_repo$ mm make ARCH=x86
#todo: may change to more gracefully way later.
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[1/2] Generate build.ninja                    
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cd build-ninja && cmake -Wno-deprecated  -G "Ninja" /home/lhcc/formation_repo -D ARCH=x86
CMake Error: The current CMakeCache.txt directory /home/lhcc/formation_repo/build-ninja/CMakeCache.txt is different than the directory /home/szk/formation_repo/build-ninja where CMakeCache.txt was created. This may result in binaries being created in the wrong place. If you are not sure, reedit the CMakeCache.txt
CMake Error: The source "/home/lhcc/formation_repo/CMakeLists.txt" does not match the source "/home/szk/formation_repo/CMakeLists.txt" used to generate cache.  Re-run cmake with a different source directory.
make: *** [Makefile:48: build-ninja] Error 1
 

原因是，编译的时候是直接从别人的虚拟机拷贝功能包时，编译好的文件目录和自己在编译的时候目录不匹配，因为是用户名不同所以会报错 ，处理办法如下。

方法一，简单粗暴，删除CMakeCache.txt，看报错中提到的重复文件。药到病除