Perl calling C calling Ruby (linking problem)

ruby-talk
1

Hi,

Ruby exception: /opt/lib/ruby/1.6/i686-linux/digest/md5.so: undefined

Post your configuration, and the commands that you have executed

pigeon% ldd regdb.so
libruby.so.1.6 => /home/ts/local/r167/lib/libruby.so.1.6 (0x40004000)
libdl.so.2 => /lib/libdl.so.2 (0x400b6000)
libm.so.6 => /lib/libm.so.6 (0x400ba000)
libcrypt.so.1 => /lib/libcrypt.so.1 (0x400db000)
libc.so.6 => /lib/libc.so.6 (0x40108000)
/lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x80000000)
pigeon%

pigeon% cat a.pl
#!/usr/bin/perl -l
use regdb;
$res = regdb::runruby("
require ‘digest/md5’
Digest::MD5.new(‘hello’)
");
print $res;
pigeon%

pigeon% perl a.pl
5d41402abc4b2a76b9719d911017c592
pigeon%

Here’s how I built regdb.so, which I call from Perl:

$ make
swig -perl regdb.i
gcc -fPIC -c regdb_wrap.c -I/usr/lib/perl5/5.6.1/i686-linux/CORE
-I/opt/lib/ruby/1.6/i686-linux gcc -fPIC -c regdb.c
-I/opt/lib/ruby/1.6/i686-linux ld -shared regdb_wrap.o regdb.o -o
regdb.so -L/opt/lib -lruby -lm -ldl -lcrypt -export-dynamic $

Ruby was built as:
./configure --enable-shared && make && make install

I’m running:
Ruby 1.67
Perl 5.6.1
swig 1.3

I’ve changed nothing in the base Ruby install; I’ve built Ruby DBI & the
Pg & MySQL drivers.

The error is:
$ perl test.pl
Ruby exception: /opt/lib/ruby/1.6/i686-linux/digest/md5.so: undefined
symbol: rb_cObject - /opt/lib/ruby/1.6/i686-linux/digest/md5.so $

Hope this helps. Let me know if you need any further info.

Best regards,
Peter Munro

2

I'm running:
  Ruby 1.67
  Perl 5.6.1
  swig 1.3

Well there is a problem

pigeon% ls
a.pl* regdb.i ruby.i
pigeon%

pigeon% cat regdb.i
%module regdb
%{
#include "ruby.h"
%}
%include ruby.i
pigeon%

pigeon% cat ruby.i
%{
static int initi = 0;
%}

%inline %{

int init(void) {
   if (!initi) {
      ruby_init();
      ruby_init_loadpath();
      initi = 1;
   }
   return 0;
}

char *runruby(char *c) {
   VALUE res;
   int error = 0;

   if (!initi) {
      init();
   }
   res = rb_eval_string_protect(c, &error);
   if (error) {
     res = rb_gv_get("$!");
   }
   res = rb_obj_as_string(res);
   return RSTRING(res)->ptr;
}

%}

pigeon%

swig was compiled with :

./configure --prefix=/home/ts/local/sw --enable-perl5 --with-ruby=/home/ts/local/r167/bin/ruby

pigeon% ~/local/sw/bin/swig -version

SWIG Version 1.3.14u-20020813-1606
Copyright (c) 1995-1998
University of Utah and the Regents of the University of California
Copyright (c) 1998-2001
University of Chicago

Compiled with CC
pigeon%

pigeon% perl -v

This is perl, v5.6.1 built for i386-linux

Copyright 1987-2001, Larry Wall

Perl may be copied only under the terms of either the Artistic License or the
GNU General Public License, which may be found in the Perl 5 source kit.

Complete documentation for Perl, including FAQ lists, should be found on
this system using `man perl' or `perldoc perl'. If you have access to the
Internet, point your browser at http://www.perl.com/, the Perl Home Page.

pigeon%

pigeon% ~/local/r167/bin/ruby -v
ruby 1.6.7 (2002-03-01) [i686-linux]
pigeon%

pigeon% ~/local/sw/bin/swig -perl regdb.i
pigeon%

pigeon% gcc -c regdb_wrap.c -I/usr/lib/perl/5.6.1/CORE -Dbool=char -I/home/ts/local/r167/lib/ruby/1.6/i686-linux
In file included from /home/ts/local/r167/lib/ruby/1.6/i686-linux/ruby.h:610,
                 from regdb_wrap.c:515:
/home/ts/local/r167/lib/ruby/1.6/i686-linux/intern.h:258: warning: `yyparse' redefined
/usr/lib/perl/5.6.1/CORE/embed.h:756: warning: this is the location of the previous definition
/home/ts/local/r167/lib/ruby/1.6/i686-linux/intern.h:259: warning: `yylex' redefined
/usr/lib/perl/5.6.1/CORE/embed.h:755: warning: this is the location of the previous definition
/home/ts/local/r167/lib/ruby/1.6/i686-linux/intern.h:260: warning: `yyerror' redefined
/usr/lib/perl/5.6.1/CORE/embed.h:751: warning: this is the location of the previous definition
pigeon%

pigeon% ld -shared regdb_wrap.o -L/home/ts/local/r167/lib -lruby -ldl -lm -lcrypt -o regdb.so
pigeon%

pigeon% cat a.pl
#!/usr/bin/perl -l
use regdb;
$res = regdb::runruby("
   require 'digest/md5'
   Digest::MD5.new('hello')
");
print $res;
pigeon%

pigeon% a.pl
5d41402abc4b2a76b9719d911017c592
pigeon%

Guy Decoux