LOAD-FOREIGN-LIBRARY on defined libraries obfuscates errors

[Nikodemus Siivola]

Lispbuilder-sdl includes a "cocoahelper" library:

(define-foreign-library cocoahelper
  (:darwin (:or (:framework "cocoahelper")
                (:default "cocoahelper"))))

Trying to (load-foreign-library 'cocoahelper) causes the error:

Unable to load any of the alternatives:
   ((:FRAMEWORK "cocoahelper") (:DEFAULT "cocoahelper"))
   [Condition of type CFFI:LOAD-FOREIGN-LIBRARY-ERROR]

which doesn't exactly help in trying to figure out what is going from. The underlying implementation in this case reported the overly verbose -- but more useful -- error:

Error opening shared object "/Users/nikodemus/quicklisp/dists/quicklisp/softwar...":
  dlopen(/Users/nikodemus/quicklisp/dists/quicklisp/software/lispbuilder-20101006-svn/lispbuilder-sdl/cocoahelper/cocoahelper.dylib, 10): no suitable image found. Did find:
 /Users/nikodemus/quicklisp/dists/quicklisp/software/lispbuilder-20101006-svn/lispbuilder-sdl/cocoahelper/cocoahelper.dylib: mach-o, but wrong architecture.