Steel Bank Common Lisp

--- I wrote:
> I'm having some  problems loading foreign code into SBCL 0.8.5
> on Darwin (OS X 10.3)
> Essentially I'm trying to load the library libcpgplot.a,
> which I've broken down into an object file cpgplot.o 
> using:
>   ar -x libcpgplot.a
>   ld -r *.o -o cpgplot.o

UPDATE:  I changed the line to recombine the .o files
into cpgplot.o into

  ld *.o -o cpgplot.o

And it works fine now, the library loads, my ffi code sees it,
and all is good.

Being unable to find foreign symbols had nothing to do with the 
underscore/no-underscore problem mentioned earlier in this list at
  http://www.caddr.com/macho/archives/sbcl-devel/2003-8/2303.html
because I had been unable to find either the foreign_function
or _foreign_function.

I still have no idea what is going on with Darwin linking.  And I don't
understand why I can't load the library libcpgplot.a directly
rather than breaking it down into constituent files and then
rebuilding a .o file.

If anyone can illuminate these issues, I would appreciate it.




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--- John Klein <jk271828@...> wrote:
> UPDATE:  I changed the line to recombine the .o files
> into cpgplot.o into
> 
>   ld *.o -o cpgplot.o
> 
> And it works fine now, the library loads, my ffi code sees it,
> and all is good.
> 

ACK! more confusion.  Mea Culpa. Actually, it works only because
I run load-foreign TWICE.   I see the foreign symbols only
after the 2nd load-foreign.     

I am lost.  If I have a library libfoo.a that depends on (say)
libbar1.a libbar2.so libbar3.a, what is the proper, canonical,
correct way to load this library into sbcl?

What I am doing now is using ar to break up libfoo.a into .o files,
and recombining them into a big libfoo.o file with ld, and then loading
this libfoo.o TWICE.   It works, but I am sure it is wrong.


eg:

(dotimes  (i 2)
  (load-foreign '("/path/to/libfoo.o") 
    :libraries '("-lbar1.a" "/path/to/libbar2.so"
                 "/path/to/libbar3.a")))


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