Robert Goldman <rpgold...@sift.net> écrivait: > I stubbed my toe on this absent-mindedly compiling Didier's decLt > system on Allegro Common Lisp. That system doesn't, and cannot, > function on ACL, but ASDF tells us it has compiled successfully.
Following up to our private conversation on this... I think there's an error on my part to begin with. The core system of Declt has an :if-feature :sbcl, which prevents it from being loaded outside SBCL. This is mostly what's needed, but I hadn't realized that it /silently/ does so, instead of throwing an error if the feature is absent. So the question is: can I declaratively state that a system (or maybe more generally a component) depends on a feature, so that loading fails with an error otherwise ? I don't currently see a way. In fact, it seems to me that the current :depends-on (:feature :this :that) syntax is a misnomer. Perhaps it would have been more explicit to write :depends-on (:if-feature :this :that) in order to express that the conditional actually may fail silently. Now, what about extending the syntax with: :depends-on (:feature :this) to actually mean "if :this is not on the features list, fail with an error"? -- Resistance is futile. You will be jazzimilated. Lisp, Jazz, Aïkido: http://www.didierverna.info
