[cffi-devel] Re: Clisp, cffi and defcfuns in a saved image

[Edgar Gonçalves]

Greetings!
I'm not really sure if this is a CFFI or a CLISP issue, so I'm posting to
both ml's.

I'm trying to make Windows executables images, using Clisp 2.41 (built with
readline, iconv and sigsegv). My images have cl projects loaded, like clsql
or celltk. These projects relly on cffi to load functions from certain dll's
(like odbc32.dll). E.g., I load clsql and save an image.

There are two problems here:
1) Unlike AllegroCL or Lispworks, Clisp (and SBCL too, btw) requires me to
precede all defcfuns related to a library with:

#+clisp (cffi::use-foreign-library Tcl)
(defcfun ("Tcl_FindExecutable" tcl-find-executable) :void
  (argv0 :string))

If I don't do this, I can't apply this function at run-time (I'm not even
talking about saved images, yet).

2) When I load the saved image (using the code from above), I get an error
when applying defcfun'ed functions, telling me the library wasn't found:
** - Continuable Error
FFI::FOREIGN-CALL-OUT: no dynamic object named "SQLAllocHandle" in
library
      :DEFAULT
 But then, if I tell clisp where the libraries are, with
(cffi:define-foreign-library odbc (t (:default "odbc32")))
(cffi:use-foreign-library odbc)

, I get this:
*** - FFI::FOREIGN-CALL-OUT: #<INVALID FOREIGN-POINTER #x00000000>
comes from
      a previous Lisp session and is invalid

The only workaround I can think of is to make an init-function on my image
that loads all these defcfuns (at run-time), but this is not very sane, if
you are to use many external CL libraries!

Thanks for the help,
-- 
Edgar Gonçalves
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