Todd Gamblin 18d63a239f bugfix: use string keys to set preferred targets (#12921) ... Preferred targets were failing because we were looking them up by Microarchitecture object, not by string. - [x] Add a call to `str()` to fix target lookup. - [x] Add a test to exercise this part of concretization. - [x] Add documentation for setting `target` in `packages.yaml`		2019-09-24 10:18:48 +02:00
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spack	bugfix: use string keys to set preferred targets (#12921)	2019-09-24 10:18:48 +02:00