From: blake
Subject: cmu-llisp: problem with linking foreign libraries
Date: 
Message-ID: <tzUdb.32560$pP6.12614@newsread2.news.atl.earthlink.net>
I am trying to learn about the cmu-lisp foreign language interface on 
cmu-lisp.  I have looked at the manaul and my machine (redhat 8.0) runs 
the "step-by-step alien example" just fine.  I would like to have access 
to some other C libraries (Intel's OpenCV library) but I am getting 
errors in linking to it. It appears that the cmu-lisp can't "open" the 
library.  The output I get is the following:
*******************
* (load-Foreign "/home/blake/aprograms/lush/hexagon_func.o" :libraries 
'("-lopencv" "-lhighgui"))
;;; Running /usr/bin/ld...


Error in function SYSTEM::LOAD-OBJECT-FILE:
    Can't open object "/tmp/3342AG1495": 
"/usr/local/lib/libhighgui-0.9.so.5: undefined symbol: __gxx_personality_v0"

Restarts:
   0: [ABORT] Return to Top-Level.

Debug  (type H for help)

(SYSTEM::LOAD-OBJECT-FILE "/tmp/3342AG1495")
Source: Error finding source:
Error in function DEBUG::GET-FILE-TOP-LEVEL-FORM:  Source file no longer 
exists:
   target:code/foreign.lisp.
0]
**************
I don't have any problem compiling and linking the program in Lush, nor 
when I use it in C.  I do *not* get the problem when I link with 
'("-lc"), but I do seem to get the problem with other libraries.  What 
could be the problem?

Thanks
Blake
From: Eric Marsden
Subject: Re: cmu-llisp: problem with linking foreign libraries
Date: 
Message-ID: <wziisnbltdb.fsf@melbourne.laas.fr>
>>>>> "bl" == blake  <········@earthlink.net> writes:

  bl> Error in function SYSTEM::LOAD-OBJECT-FILE:
  bl> Can't open object "/tmp/3342AG1495":
  bl> "/usr/local/lib/libhighgui-0.9.so.5: undefined symbol:
  bl> __gxx_personality_v0"

this symbol is related to the C++ support in GCC; probably the highgui
library is implemented in C++. You should add the C++ runtime to the
list of dependent libraries ("-lstdc++").
  
-- 
Eric Marsden                          <URL:http://www.laas.fr/~emarsden/>
From: Blake Hurt
Subject: Re: cmu-llisp: problem with linking foreign libraries
Date: 
Message-ID: <lrXdb.33681$pP6.27726@newsread2.news.atl.earthlink.net>
You were right;  I did need the C++ support.  However, I tried using the 
"-lstdc++", and it still complained of not finding the files.  I then 
loaded the foreign files directly , a la

(load-Foreign "/usr/lib/libstdc++.so.5" )
(load-foreign  "/usr/local/lib/libopencv.so")
(load-foreign "/usr/local/lib/libhighgui.so")

and this seems to work fine.  Thanks for your help.
Blake

Eric Marsden wrote:
>>>>>>"bl" == blake  <········@earthlink.net> writes:
> 
> 
>   bl> Error in function SYSTEM::LOAD-OBJECT-FILE:
>   bl> Can't open object "/tmp/3342AG1495":
>   bl> "/usr/local/lib/libhighgui-0.9.so.5: undefined symbol:
>   bl> __gxx_personality_v0"
> 
> this symbol is related to the C++ support in GCC; probably the highgui
> library is implemented in C++. You should add the C++ runtime to the
> list of dependent libraries ("-lstdc++").
>
comp.lang.lisp / 2003 / sep