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

os_dlsym_default is probably to blame.

On Thu, Mar 27, 2025 at 4:14 PM Uģis Lācis <[email protected]> wrote:
>
> Dear SBCL community,
>
>
>
> I am trying to use SBCL to define a LISP function I should be able to call from C. My working platform is Windows 11. I have gone through the information I could find on the topic, but can not make a basic example work. I have found discussions around this topic (with similar error traces as I am getting), but without a solution that would work for me. So what I am trying to do now:
>
>
>
> I have found an example (Re: [Sbcl-help] Calling Lisp from C (SBCL as a shared object) | Steel Bank Common Lisp) that should be working for exporting a callable LISP function.
> I have saved the LISP code as-is in a “test1.lsp” file.
> To check that I can produce a valid core, I do:
>
> sbcl.exe --script "test1.lsp" --noinform
> sbcl.exe --core libsum.core
>
>
>
> After these steps I get the error, which is attached at the end of this message (I have also seen it in the thread I referenced above). I have tried these steps both in pre-built Windows installation downloaded from SBCL home page (SBCL 2.5.1) and also in compiled version from the git source (SBCL 2.5.2.155-1d476f1e0). I get the same output if I load the core as written above or via linking to compiled libsbcl.so shared library.
>
>
>
> Has anyone gotten this functionality to work on Windows? Any suggestions about how to get this working would be highly appreciated.
>
>
>
> Best wishes,
> Ugis
>
>
>
> -------------------------------------
>
> ------------------------ ERROR
> -------------------------------------
> Unhandled SB-KERNEL::UNDEFINED-ALIEN-VARIABLE-ERROR in thread #<SB-THREAD:THREAD tid=47068 "main thread" RUNNING
>
>                                                                  {1100BA8003}>:
>
>   Attempt to access an undefined alien variable.
>
>
>
> Backtrace for: #<SB-THREAD:THREAD tid=47068 "main thread" RUNNING {1100BA8003}>
>
> 0: (SB-DEBUG::DEBUGGER-DISABLED-HOOK #<SB-KERNEL::UNDEFINED-ALIEN-VARIABLE-ERROR {1100B9E613}> #<unused argument> :QUIT T)
>
> 1: (SB-DEBUG::RUN-HOOK *INVOKE-DEBUGGER-HOOK* #<SB-KERNEL::UNDEFINED-ALIEN-VARIABLE-ERROR {1100B9E613}>)
>
> 2: (INVOKE-DEBUGGER #<SB-KERNEL::UNDEFINED-ALIEN-VARIABLE-ERROR {1100B9E613}>)
>
> 3: (ERROR SB-KERNEL::UNDEFINED-ALIEN-VARIABLE-ERROR)
>
> 4: (SB-KERNEL::UNDEFINED-ALIEN-VARIABLE-ERROR)
>
> 5: ("foreign function: #x140046D35")
>
> 6: ("foreign function: #x140046E00")
>
> 7: ((SETF SB-SYS:SAP-REF-SAP) :INVALID-VALUE-FOR-UNESCAPED-REGISTER-STORAGE :INVALID-VALUE-FOR-UNESCAPED-REGISTER-STORAGE :INVALID-VALUE-FOR-UNESCAPED-REGISTER-STORAGE)
>
> 8: (SB-EVAL::EVAL-PROGN ((SETF (SB-SYS:SAP-REF-SAP SB-ALIEN::SAP (/ SB-ALIEN::OFFSET SB-VM:N-BYTE-BITS)) SB-ALIEN::VALUE) (SB-ALIEN-INTERNALS:NATURALIZE SB-ALIEN::VALUE (QUOTE #<ALIEN-TYPE (* T)>))) #<SB-EVAL::ENV {1100B9E1F3}>)
>
> 9: ((SETF SB-ALIEN-INTERNALS:%ALIEN-VALUE) #<SB-ALIEN-INTERNALS:ALIEN-VALUE :SAP #X20010CC0 :TYPE (* T)> #.(SB-SYS:INT-SAP #X001D0000) 0 #<ALIEN-TYPE (* T)>)
>
> 10: (SB-IMPL::%START-LISP)
>
> 11: ("foreign function: #x140046D35")
>
> 12: ("foreign function: #x14000A160")
>
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