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Seth R Johnson authored
If all SWIG cache variables (EXECUTABLE, DIR, VERSION) are set, there should be no need to invoke the SWIG exe on a reconfigure. This changeset reduces the number of calls to the SWIG executable, and additonially prevents temporary `SWIG_xxx` values from propagating outside the `find_package` call. I also refactored the conditionals to be less nested (and thus more predictable), including changing theh definition of SWIG_USE_FILE to reflect that it's if and only if SWIG_FOUND is trure.
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