[CMake] Set variable value based on generated files

[Hariharan]

First off, I apologize if this is a very newbie-level question.
I need to set the value of a variable based on based on generated files,
using the "file" command. Something like:
file(GLOB varFoo "*.cpp")

Here the cpp files are generated, so the value of varFoo comes up as empty
when the build runs the first time. Is there any way to add a dependency on
the file generation step to the "file" command?
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