New in version 3.13.
Specify whether to report a message for each make rule.
If set in the cache it is used to initialize the value of the RULE_MESSAGES property. Users may disable the option in their local build tree to disable granular messages and report only as each target completes in Makefile builds.
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https://cmake.org/cmake/help/v3.19/variable/CMAKE_RULE_MESSAGES.html