b3711c0d9d
This PR adds error message sentinels to the clingo solve, attached to each of the rules that could fail a solve. The unsat core is then restricted to these messages, which makes the minimization problem tractable. Errors that can only be generated by a bug in the logic program or generating code are prefaced with "Internal error" to make clear to users that something has gone wrong on the Spack side of things. * minimize unsat cores manually * only errors messages are choices/assumptions for performance * pre-check for unreachable nodes * update tests for new error message * make clingo concretization errors show up in cdash reports fully * clingo: make import of clingo.ast parsing routines robust to clingo version Older `clingo` has `parse_string`; newer `clingo` has `parse_files`. Make the code work wtih both. * make AST access functions backward-compatible with clingo 5.4.0 Clingo AST API has changed since 5.4.0; make some functions to help us handle both versions of the AST. Co-authored-by: Todd Gamblin <tgamblin@llnl.gov> |
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