Massimiliano Culpo 42b8355269 targets: print a warning message before downgrading (#13513) ... * Make package preferences a soft failure for targets, instead of a hard failure. * Added unit tests for preferences expressed via packages.yaml		2019-11-01 03:36:28 -07:00
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spack	targets: print a warning message before downgrading (#13513)	2019-11-01 03:36:28 -07:00