asdf-devel April 2021

asdf-devel@common-lisp.net

9 participants
3 discussions

ASDF components are brittle for backwards compatibility
by Robert Goldman 30 Apr '21

30 Apr '21

ASDF checks to make sure all of the initargs are defined when parsing a `defsystem`. This is good for catching errors, but is terrible for extensibility. This means that any attempt to add additional metadata will be backwards incompatible. I can think of two ways to fix this: 1. Add a "garbage can" slot to `component` that will be filled with a property list, and allow programmers to do whatever they want here. This doesn't seem great to me. 2. Add a new `defsystem` parsing error class that is `unknown-component-property`, raise it when an unknown property is encountered and allow the user to continue, discarding the initarg and accompanying value. The second alternative is what I favor. It isn't great, because it will only maintain extensibility going forward, but I think it's the best we can do. I suppose that we could also add an initarg to tell ASDF to continue such errors silently. I'd be inclined to suggest that this take an ASDF version expression as value, so that the error is quietly ignored only by ASDF versions below that. This means that the property will start to be checked when it has become authoritative. Note that for one's own `system` and `component` subclasses, the set of initargs can be extended without any monkeying around.

7 13

only perfom when the output is missing
by Attila Lendvai 17 Apr '21

17 Apr '21

dear hackers, i cannot convince ASDF to only perform my custom operation if the output file doesn't exist; i.e. regardless of the modification times. it's in cffi/c2ffi: foo.h -> foo.spec -> foo.lisp when the spec is there, regardless of the mod time, i'd like to skip the spec generation task. neither reading the manual, nor grepping around helped me to come up with the required magic. my custom operation-done-p isn't even called if the file's mod time instructs ASDF to run the operation. any hints are appreciated, including pointers to examples or tests. - attila PS: i sent the same mail from the wrong account, don't allow that through moderation please.

4 6

only perfom when output is missing
by Attila Lendvai 14 Apr '21

14 Apr '21

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asdf-devel April 2021