Re: how to use gsl with the guile ffi

[Neil Jerram]

tantalum <address@hidden> writes:

> im getting the error "In procedure dynamic-link: file: "libgsl", 
> message: "file not found"" with the following code:
>
>      (import (system foreign))
>      (define gsl (dynamic-link "libgsl"))
>
> * gsl (optionally?) depends on libgslcblas, which itself links without 
> error, but loading it with (dynamic-link) beforehand did not help
> * some libraries work, for example libmagic. libm for example gives the 
> same error message
> * the file /usr/lib/libgsl.so exists and is a symlink to the regular 
> file libgsl.so.23.1.0 whose content begins with ELF>
> * similar problem on the mailing list 
> https://lists.gnu.org/archive/html/guile-user/2016-05/msg00010.html
> * ive tried to set LD_LIBRARY_PATH with export to /usr/lib with no 
> apparent effect
> * i was going from this manual entry 
> https://www.gnu.org/software/guile/manual/html_node/Dynamic-FFI.html
> * guile (GNU Guile) 2.2.4
>
> the issue can actually be reproduced with a c program:
>
>      #include <dlfcn.h>
>      #include <stdio.h>
>
>      int main () {
>        void* a = dlopen("libgsl.so", RTLD_NOW);
>        printf("got %p\n", a);
>        if (a) printf("ok\n"); else printf("error: %s\n", dlerror());
>      }
>
> gcc t.c -ldl && ./a.out
>
> the program only works without error when compiled with -lgslcblas.
> so, it could be a more basic issue, but i dont know how to proceed.

You could run under strace to confirm which files are being looked for,
and which of those are not found.

Regards,
    Neil