Todd Gamblin d94d957536 concretizer: simplify and suppress warnings for variant handling ... We are relying on default logic in the variant handling in that we set a default value if we never see `variant_set(P, V, X)`. - Move the logic for this into `concretize.lp` instead of generating it for every package. - For programs that don't have explicit variant settings, clingo warns that variant_set(P, V, X) doesn't appear in any rule head, because a setting is never generated. - Specifically suppress this warning.		2020-11-17 10:04:13 -08:00
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spack	concretizer: simplify and suppress warnings for variant handling	2020-11-17 10:04:13 -08:00