spurious undefined alien warnings from load-foreign-library on SBCL

[Cyrus Harmon]

in load-foreign-library there's a comment about dlopen/dlclose not doing reference counting and how CFFI has to close and the reload the foreign library. CFFI ignores foreign-library-undefined-error conditions but perhaps it should also ignore style-warnings so we don't get SBCL's undefined alien warnings when a library is reloaded?

[Luís Oliveira (luismbo)]

That sounds like a good idea, yes, although I'm not 100% sure whether SBCL should be signalling those. In any case, it seems straightforward to handle this on the CFFI side.