Massimiliano Culpo d00e8394f8 concretizer: handle conflicts with compiler ranges correctly ... As reported, conflicts with compiler ranges were not treated correctly. This commit adds tests to verify the expected behavior for the new concretizer. The new rules to enforce a correct behavior involve: - Adding a rule to prefer the compiler selected for the root package, if no other preference is set - Give a strong negative weight to compiler preferences expressed in packages.yaml - Maximize on compiler AND compiler version match		2020-11-17 10:04:13 -08:00
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spack	concretizer: handle conflicts with compiler ranges correctly	2020-11-17 10:04:13 -08:00