compiling c program using rb_eval_string()

[hongseok.yoon]

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?

 

[ashishwave]

i also got the same error.
bye
Ashish

 

[Caleb Tennis]

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]

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 !!