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[CMAKE] Hint to user to the option flags when an optional dependency is not found
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Authored by Fabien on Tue, Jun 8, 09:32.

Details

Summary

Since cmake 3.16 there is an option to append a message in case of
failure to the standard error message. The output will look like:

Could NOT find Jemalloc (missing: Jemalloc_INCLUDE_DIR) (Required is at
  least version "3.6.0")

      Reason given by package: this is an optional dependency that can
be disabled by passing -DUSE_JEMALLOC=OFF to the cmake command line
Test Plan

Uninstall an optional dependency and check the error message hints to
the option flag as expected.

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