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comp.lang.ruby

compiling c program using rb_eval_string

hongseok.yoon

2/23/2006 11:48:00 AM

I tried to call rb_eval_string(), so I wrote simple C code.

#include "/home/xopht/lib/1.8/i686-linux/ruby.h"

int main()
{
rb_eval_string( "puts" );
return 0;
}

I compiled it and get bellow result.

[xopht@odin ruby]$ g++ -o test test.cc -lruby-static -L/home/xopht/lib/
/home/xopht/lib//libruby-static.a(string.o)(.text+0x319a): In function
`rb_str_crypt':
/home/xopht/ruby/ruby-1.8.4/string.c:4360: undefined reference to
`crypt'
/home/xopht/lib//libruby-static.a(dln.o)(.text+0x9f): In function
`dln_load':
/home/xopht/ruby/ruby-1.8.4/dln.c:1351: undefined reference to `dlopen'
/home/xopht/lib//libruby-static.a(dln.o)(.text+0xb6):/home/xopht/ruby/ruby-1.8.4/dln.c:1356:
undefined reference to `dlsym'
/home/xopht/lib//libruby-static.a(dln.o)(.text+0x12b):/home/xopht/ruby/ruby-1.8.4/dln.c:1359:
undefined reference to `dlclose'
/home/xopht/lib//libruby-static.a(dln.o)(.text+0x5): In function
`dln_strerror':
/home/xopht/ruby/ruby-1.8.4/dln.c:1193: undefined reference to
`dlerror'
collect2: ld returned 1 exit status
[xopht@odin ruby]$

what's wrong?
4 Answers

Gyoung-Yoon Noh

2/23/2006 12:40:00 PM

0

On 2/23/06, hongseok.yoon@gmail.com <hongseok.yoon@gmail.com> wrote:> I tried to call rb_eval_string(), so I wrote simple C code.>> #include "/home/xopht/lib/1.8/i686-linux/ruby.h">> int main()> {> rb_eval_string( "puts" );> return 0;> }>> I compiled it and get bellow result.>> [xopht@odin ruby]$ g++ -o test test.cc -lruby-static -L/home/xopht/lib/> /home/xopht/lib//libruby-static.a(string.o)(.text+0x319a): In function> `rb_str_crypt':> /home/xopht/ruby/ruby-1.8.4/string.c:4360: undefined reference to> `crypt'> /home/xopht/lib//libruby-static.a(dln.o)(.text+0x9f): In function> `dln_load':> /home/xopht/ruby/ruby-1.8.4/dln.c:1351: undefined reference to `dlopen'> /home/xopht/lib//libruby-static.a(dln.o)(.text+0xb6):/home/xopht/ruby/ruby-1.8.4/dln.c:1356:> undefined reference to `dlsym'> /home/xopht/lib//libruby-static.a(dln.o)(.text+0x12b):/home/xopht/ruby/ruby-1.8.4/dln.c:1359:> undefined reference to `dlclose'> /home/xopht/lib//libruby-static.a(dln.o)(.text+0x5): In function> `dln_strerror':> /home/xopht/ruby/ruby-1.8.4/dln.c:1193: undefined reference to> `dlerror'> collect2: ld returned 1 exit status> [xopht@odin ruby]$>> what's wrong?>>>rb_string_eval() needs to be initialized properly.Check this,http://phrogz.net/ProgrammingRuby/ext_ruby.html#extendingrubyhttp://www.rubygarden.org/ruby?EmbedRuby--http://nohmad.su...

ashishwave

2/23/2006 1:10:00 PM

0

i also got the same error.
bye :-)
Ashish

Caleb Tennis

2/23/2006 1:32:00 PM

0


> I compiled it and get bellow result.

This is in your C compiler. You probably need to add some library flags like
"-lcrypt -ldl" or others in order for the linker to be happy.

hongseok.yoon

2/24/2006 2:45:00 AM

0

You guys are really helpful !!

I changed my code...

int main()
{
ruby_init();
rb_eval_string( "puts" );
return 0;

}


and compiled it.

[xopht@odin ruby]$ g++ -o test test.cc -lruby-static -L/home/xopht/lib/
-lcrypt -ldl

now it works correctly !!

thanks a lot !!