Luis, thanks for the response 29.05.2017, 05:18, "Luís Oliveira" <luismbo@gmail.com>:
You can look up both functions using foreign-symbol-pointer to decide which one to call. You'd usually call the right one using foreign-funcall-pointer, but perhaps you can defcfun both and call the right one based on the lookup.
Will that work on Corman?
defcfun-ing non-existent functions will yield runtime warnings on some implementations (notably SBCL) so perhaps you might want to implement both the foreign-funcall-pointer and defcfun approaches and conditionalise them accordingly.
BTW, CMUCL fails with error in this case.
HTH, Luís
On Mon, May 29, 2017, 02:56 Anton Vodonosov <avodonosov@yandex.ru> wrote:
Hello,
OpenSSL renamed function SSLeay to OpenSSL_version_num. So, so depending on what version of library we work with we need to call either SSLeay or OpenSSL_version_num.
What is the best way to do it?
The following is one approach:
(or (ignore-errors (cffi:foreign-funcall "OpenSSL_version_num" :long)) (ignore-errors (cffi:foreign-funcall "SSLeay" :long)))
but it won't work on Corman Lisp because it doesn't support cffi:foreign-funcall.
I would like to be fully portable. Is there a better way?
Best regards, - Anton