[CMake] How to partial-build like kconfig of Linux kernel do?

[Sam H.]

Hi,

I use option and configure_file commands to generate header file for
feature selection in project.
I can use ccmake to change options and then regenerate header file.
However, files referring to header file will all be rebuilt.

It likes the case mentioned in comments of scripts/basic/fixed.c of Linux
kernel.

How can I do to partial build like kconfig of Linux kernel do?

Thanks,
Sam
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