Todd Gamblin 0620d954f5 concretizer: don't generate rules for empty version lists ... If the version list passed to one_of_iff is empty, it still generates a rule like this: node_compiler_version_satisfies("fujitsu-mpi", "arm", ":") :- 1 { } 1. 1 { } 1 :- node_compiler_version_satisfies("fujitsu-mpi", "arm", ":"). The cardinality rules on the right and left above are never satisfiale, and these rules do nothing. - [x] Skip generating any rules at all for empty version lists.		2020-11-17 10:04:13 -08:00
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spack	concretizer: don't generate rules for empty version lists	2020-11-17 10:04:13 -08:00