[CMake] Running a function as a build target

[Rick McGuire]

Is it possible to invoke a script function as part of a target?  I have a
build step where I need to process a bunch of variable values before
building a particular target.  All of the custom targets require a COMMAND,
not a function.  I thought maybe I could push this off to a script invoked
by cmake -P, but a quick test revealed that the script does not inherit the
variable environment and the variables I'm working with cannot be easily
passed using -D values on the command line.

Rick
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