[CMake] How to duplicate a source file and rename it

[Ke Gao]

Hi,

In a project, I need to first duplicate a source file and rename it. For
example, I want to change "file.c" to "aaa_file.c", and after compiling, I
will delete it. This is similar to using "cp file.c aaa_file.c". How to
easily do this in CMake? I found "file" command doesn't work well for this.

Thank you very much.

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Ke Gao
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