Commit 98cdb658 authored by Committed by Brad King
ExternalProject: Add CMAKE_CACHE_DEFAULT_ARGS arguments
This argument allows to set default arguments that are written in the initial cache file, but that are not forced, and therefore allows the user to change these values later (CMAKE_ARGS and CMAKE_CACHE_ARGS always overwrite the values). Also add some documentation to explain the differences between these 3 arguments. Extend ExternalProjectLocal test to cover CMAKE_CACHE_DEFAULT_ARGS.
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