编译安装mysql8 报错：Please do not build in-source. Out-of source builds are highly

一、故障现象

编译安装mysql8，执行cmake命令时报错：

1. CMake Error at CMakeLists.txt:301 (MESSAGE):
   
2.   Please do not build in-source.  Out-of source builds are highly
   
3.   recommended: you can have multiple builds for the same source, and there is
   
4.   an easy way to do cleanup, simply remove the build directory (note that
   
5.   'make clean' or 'make distclean' does *not* work)
   
6. 
   
7.   You *can* force in-source build by invoking cmake with
   
8.   -DFORCE_INSOURCE_BUILD=1
   
9. 
   
10. 
    
11. -- Configuring incomplete, errors occurred!
    
12. See also "/usr/local/mysql-8.0.16/CMakeFiles/CMakeOutput.log".

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二、解决方法

cmake命令加上 -DFORCE_INSOURCE_BUILD=1 参数。