"D. Martinez" <denis.martinez@live.com> writes:
Hello. Being new to "serious" CL programming I am hitting a brick wall right now in one CLOS project. After some time of infructuous searching I cannot find the source of my problem, which may be of either MKCL or ASDF but I lack the knowledge to debug this. Mr. JCB, who I have seen active on this list, may (hopefully!) be able to shed some light on the issue.
The bug I encounter happens when I load the project by the means of ASDF. I can not reproduce it otherwise. It is triggered by a use of a custom metaclass, and it suggests that a file is loaded more times than it should.
I have narrowed down the problem to a small program, so here it is: ;;;; hello.asd (asdf:defsystem #:hello :description "Describe hello here" :author "Your Name <your.name@example.com>" :license "Specify license here" :serial t :components ((:file "package") (:file "a")) :depends-on ())
;;;; package.lisp (defpackage #:hello (:use #:cl))
;;;; a.lisp (in-package #:hello) (defclass A-class (standard-class) ()) (defclass A (standard-object) () (:metaclass A-class))
AFAIK, you need to define a validate-superclass method when you define a new metaclass: ---- a.lisp ------------------------------------------------------------ (in-package #:hello) (defclass A-class (standard-class) ()) (defmethod validate-superclass ((class A-class) (super standard-class)) t) (defclass A (standard-object) () (:metaclass A-class)) ---- hello.asd --------------------------------------------------------- (asdf:defsystem #:hello :description "Describe hello here" :author "Your Name <your.name@example.com>" :license "Specify license here" :serial t :components ((:file "package") (:file "a")) :depends-on ("closer-mop")) ---- package.lisp ------------------------------------------------------ (defpackage #:hello (:use #:cl) (:import-from #:closer-mop #:validate-superclass)) ------------------------------------------------------------------------
I will happily provide more specific info at request. The bug occured on MKCL 1.1.9 and 1.1.10 git with bundled ASDF.
I tested it with ccl. -- __Pascal Bourguignon__ http://www.informatimago.com/ “The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment.” -- Carl Bass CEO Autodesk