I think there's an issue with void functions, for example:
(cffi:defcfun ("srand" c-srand) :void '(:unsigned-int))
(defun test-srand ()
"invokes srand function"
(cffi:foreign-funcall "srand"))
(test-srand)
;;;
;;; Compiling cffi-test.lisp.
;;; OPTIMIZE levels: Safety=2, Space=0, Speed=3, Debug=0
;;;
;;; Compiling (CFFI:DEFCFUN ("srand" C-SRAND) ...).
;;; Compiling (DEFUN TEST-SRAND ...).
;;; End of Pass 1.
;;; Emitting code for C-SRAND.
;;; Error:
;;; in file cffi-test.lisp, position 415
;;; at (DEFCFUN (srand C-SRAND) ...)
;;; * Used @(RETURN 0) in a C-INLINE form with 0 output values
;;; Loading "/Users/sylvain/src/LISP/cffi_ecl/cffi-test.fas"
On Nov 22, 2012, at 11:53 AM, Sylvain Ageneau <agen...@gmail.com> wrote:
> Great!
>
> I'll try that and report back. Many thanks.
>
> On Nov 22, 2012, at 11:16 AM, Juan Jose Garcia-Ripoll
> <juanjose.garciarip...@gmail.com> wrote:
>
>> I am attaching a patch for CFFI that allows ECL to build code that does not
>> use dlopen() but rather uses the function symbols as they are know to the C
>> compiler. This is best explained in the code comments, which I reproduce
>> below, and in the example.
>>
>> The patched CFFI is available at my github account
>> https://github.com/juanjosegarciaripoll/cffi
>>
>> This is how the example is used
>>
>> bash-3.2$ ecl -norc
>> ECL (Embeddable Common-Lisp) 12.7.1
>> (git:e95fa190ccab10a5dcca791658d7d3ff24a77240)
>> Copyright (C) 1984 Taiichi Yuasa and Masami Hagiya
>> Copyright (C) 1993 Giuseppe Attardi
>> Copyright (C) 2000 Juan J. Garcia-Ripoll
>> ECL is free software, and you are welcome to redistribute it
>> under certain conditions; see file 'Copyright' for details.
>> Type :h for Help.
>> Top level in: #<process TOP-LEVEL>.
>> > (load "build")
>> [...]
>> To load "cffi":
>> Load 1 ASDF system:
>> cffi
>> ; Loading "cffi"
>>
>> ;;;
>> ;;; Compiling cffi-test.lisp.
>> ;;; OPTIMIZE levels: Safety=2, Space=0, Speed=3, Debug=0
>> ;;;
>> ;;; Compiling (CFFI:DEFCFUN ("sin" C-SINE) ...).
>> ;;; Compiling (DEFUN FF-C-SINE ...).
>> ;;; End of Pass 1.
>> ;;; Emitting code for C-SINE.
>> ;;; Emitting code for FF-C-SINE.
>> ;;; Finished compiling cffi-test.lisp.
>> ;;;
>> ;;; Loading "/Users/jjgarcia/build/cffi-static/cffi-test.fas"
>>
>> sin(pi) = 1.22464679914735320720000000000000d-16
>> #P"/Users/jjgarcia/build/cffi-static/build.lisp"
>>
>> This is the self-explanatory comment
>>
>> ;;;
>> ;;; ECL allows many ways of calling a foreign function, and also many
>> ;;; ways of finding the pointer associated to a function name. They
>> ;;; depend on whether the FFI relies on libffi or on the C/C++ compiler,
>> ;;; and whether they use the shared library loader to locate symbols
>> ;;; or they are linked by the linker.
>> ;;;
>> ;;; :DFFI
>> ;;;
>> ;;; ECL uses libffi to call foreign functions. The only way to find out
>> ;;; foreign symbols is by loading shared libraries and using dlopen()
>> ;;; or similar.
>> ;;;
>> ;;; :DLOPEN
>> ;;;
>> ;;; ECL compiles FFI code as C/C++ statements. The names are resolved
>> ;;; at run time by the shared library loader every time the function
>> ;;; is called
>> ;;;
>> ;;; :C/C++
>> ;;;
>> ;;; ECL compiles FFI code as C/C++ statements, but the name resolution
>> ;;; happens at link time. In this case you have to tell the ECL
>> ;;; compiler which are the right ld-flags (c:*ld-flags*) to link in
>> ;;; the library.
>> ;;;
>> (defvar *cffi-ecl-method*
>> #+dffi :dffi
>> #+(and dlopen (not dffi)) :dlopen
>> #-(or dffi dlopen) :c/c++
>> "The type of code that CFFI generates for ECL: :DFFI when using the
>> dynamical foreign function interface; :DLOPEN when using C code and
>> dynamical references to symbols; :C/C++ for C/C++ code with static
>> references to symbols.")
>>
>>
>> --
>> Instituto de Física Fundamental, CSIC
>> c/ Serrano, 113b, Madrid 28006 (Spain)
>> http://juanjose.garciaripoll.googlepages.com
>> <build.lisp><cffi-test.lisp><0001-Allow-the-ECL-backend-to-support-different-combinati.patch>
>
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