Manually compile and install MySQL5.5.28a

One of the important features of cmake is that it is independent from the out-of-source compilation function. That is, the compilation can be performed in another specified directory instead of the source directory.

One of the important features of cmake is that it is independent from the out-of-source compilation function. That is, the compilation can be performed in another specified directory instead of the source directory.

One of the important features of cmake is that it is independent from the out-of-source compilation function. That is, the compilation can be performed in another specified directory rather than the source directory, this ensures that the source code directory is not affected by any compilation. Therefore, different compilation operations can be performed on the same source code tree multiple times, such as compiling on different platforms.

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