[cmucl-imp] ignore-errors for missing foreign functions

[Anton Vodonosov]

Hello CMUCL list,

Code like this:

    (ignore-errors
     (cffi:defcfun ("SSL_CTX_set_default_verify_dir" ssl-ctx-set-default-verify-dir)
         :int
       (ctx :pointer)))

fails despite ignore-errors if the foreign function is absent (the libssl.so version loaded doesn't have it).

It fails when the fasl file containing this code is loaded:

   KERNEL:SIMPLE-PROGRAM-ERROR: Undefined foreign symbol: "SSL_CTX_set_default_verify_dir"

I wanted to look in the manual, but the manual links provided at https://www.cons.org/cmucl/doc/index.html are broken (e.g. http://common-lisp.net/project/cmucl/doc/cmu-user/, http://common-lisp.net/project/cmucl/doc/cmu-user-html.tgz)

The same failure even if we modify the code this way:

    (when nil
     (cffi:defcfun ("SSL_CTX_set_default_verify_dir" ssl-ctx-set-default-verify-dir)
         :int
       (ctx :pointer)))

Is there a way to not fail when the function is absent?

Best regards,
- Anton