compiling and linking a trivial guile example

compiling and linking a trivial guile example

[Ido Yehieli]

Hi,
     I've contemplating embedding guile as a scripting language in one 
of      my c++ applications.

I've been reading the reference manual, and tried compiling the first 
example
(from 
http://www.gnu.org/software/guile/docs/docs-1.8/guile-ref/Linking-Guile-into-Programs.html#Linking-Guile-into-Programs):

*****start simple-guile.c*****
      #include <stdlib.h>
      #include <libguile.h>

      static SCM
      my_hostname (void)
      {
        return scm_str2string (getenv ("HOSTNAME"));
      }

      static void
      inner_main (void *data, int argc, char **argv)
      {
        scm_c_define_gsubr ("my-hostname", 0, 0, 0, my_hostname);
        scm_shell (argc, argv);
      }

      int
      main (int argc, char **argv)
      {
        scm_boot_guile (argc, argv, inner_main, 0);
        return 0; /* never reached */
      }
***** end  simple-guile.c*****


like instructed, with:

gcc -o simple-guile simple-guile.c -lguile


However, i get this error message:

/tmp/ccerLXy4.o: In function `my_hostname':simple-guile.c:(.text+0x16): 
undefined reference to `scm_str2string'


I tried also compiling it with:

gcc -o simple-guile simple-guile.c -lguile -lguile-ltdl -lqthreads 
-lpthread -lcrypt -lm

because 'guile-config link' gave the following:

-lguile -lguile-ltdl -lqthreads -lpthread -lcrypt -lm


but to no avail. guile-config compile returns an empty line.
What am I doing wrong?

Thanks,
Ido Yehieli.


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Re: compiling and linking a trivial guile example

[Chusslove Illich]

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> [: Ido Yehieli :]
> return scm_str2string (getenv ("HOSTNAME"));
> [...]
> /tmp/ccerLXy4.o: In function `my_hostname':simple-guile.c:(.text+0x16):
> undefined reference to `scm_str2string'

scm_str2string doesn't seem to exist. If you use -Wall when compiling, 
it'll warn about implicit declaration.

Use scm_makfrom0str for deep copy, or scm_take0str for shallow copy (this 
all Guile 1.6, don't know about 1.8).

-- 
Chusslove Illich (Часлав Илић)

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Re: compiling and linking a trivial guile example

[dsmich]

---- Chusslove Illich <caslav.ilic@gmx.net> wrote: 
> > [: Ido Yehieli :]
> > return scm_str2string (getenv ("HOSTNAME"));
> > [...]
> > /tmp/ccerLXy4.o: In function `my_hostname':simple-guile.c:(.text+0x16):
> > undefined reference to `scm_str2string'
> 
> scm_str2string doesn't seem to exist. If you use -Wall when compiling, 
> it'll warn about implicit declaration.
> 
> Use scm_makfrom0str for deep copy, or scm_take0str for shallow copy (this 
> all Guile 1.6, don't know about 1.8).

Guile 1.8 uses scm_from_locale_string.

-Dale



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