[CMake] Running custom executable

[Daniel Dilts]

I have a custom executable that does some codegen to produce an enumeration
and a couple of tables.  I need this to be run against each source file
before actual compilation.  It needs include directories and macro
definitions from the build system.

Is there a way to do this with a CMake build system?  add_custom_command
seems like it might work, but I need all runs of the custom executable to
run before compilation begins.
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