Re: Calling Lisp from C (SBCL as a shared object)

Hello Gareth,

I think you just need to add -rdynamic to your gcc command

Sage Imel


On Fri, Jan 17, 2025, at 7:55 PM, J. Gareth Williams wrote:
> Hi,
> 
> I have been struggling to get even a trivial example of DEFINE-ALIEN-CALLABLE to work, and was wondering if anyone could take a look at what I might be doing wrong.
> 
> Full source:
>     git clone https://gitlab.com/garethw14/simple-sbcl-alien-callable.git
> 
> It compiles okay and links, but on initialize_lisp(), I land in the debugger:
> 
> ---
> In main, about to initialize_lisp()
> 
> debugger invoked on a SB-KERNEL::UNDEFINED-ALIEN-VARIABLE-ERROR in thread
> #<THREAD "main thread" RUNNING {10013A8003}>:
> *  Attempt to access an undefined alien variable.
*
> Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.
> 
> restarts (invokable by number or by possibly-abbreviated name):
>   0: [ABORT] Exit from the current thread.
> 
> ("foreign function: call_into_lisp_")
> 0] 
> ---
> 
> I've tried some other examples I've found around the web, but they seem to yield the same result.
> 
> Tested on Debian 12.9, SBCL versions 2.5.0 and 2.3.2
> 
> Would appreciate any insight!
> 
> gareth
> 
> 
> 
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