3e570ce694
In most cases, we want condition_holds(ID) to imply any imposed constraints associated with the ID. However, the dependency relationship in Spack is special because it's "extra" conditional -- a dependency *condition* may hold, but we have decided that externals will not have dependencies, so we need a way to avoid having imposed constraints appear for nodes that don't exist. This introduces a new rule that says that constraints are imposed *unless* we define `do_not_impose(ID)`. This allows rules like dependencies, which rely on more than just spec conditions, to cancel imposed constraints. We add one special case for this: dependencies of externals. |
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