From: Zach Dennis <zdennis@...>
Date: 2003-12-03T11:55:58+09:00
Subject: Re: Embedding Ruby in C

I got it! Brad you are an inspiration!!! Here's the cl line I got to work:

cl test.c /link /LIBPATH:c:\source\ruby-1.8.1 msvcrt-ruby18.lib

At first I tried giving an absolute path to the file(
"c:\source\ruby-1.8.1\msvcrt-ruby18.lib" ) but later saw an example on the
python newsgroup showing the( "c:\source\ruby-1.8.1 msvcrt-ruby18.lib" ).

I first tried to link against the msvcrt-ruby18-static.lib because it is
almost 3.5mb, but it didn't work. It gave me a bunch more unresolved
external symbol errors. The msvcrt-ruby18.lib seemed to do the job and when
i was done, i ran it. It worked great!! It was just a simple hello world
app.

Thanks alot to Brad and Ron for posting their responses.

-Zach

For any search engines scanning this page: msvc microsoft visual c++
embedding ruby into C program


-----Original Message-----
From: Brad [mailto:coish@hfx.eastlink.ca]
Sent: Tuesday, December 02, 2003 7:07 PM
To: ruby-talk ML
Subject: Re: Embedding Ruby in C


What's the compile command line look like?  Seems to me that you're
trying to link without telling the compiler where the implementation of
ruby_init(), etc. are located.

You need to find out what the name of the shared library (or static
library, which ever you prefer) for your operating system (For example,
on a Linux system the library might be ruby.so or ruby.lib, I don't know
what it's actually called :) ) and link that file to your program.

e.g.
Suppose the library is actually ruby.so
Suppose you're using cc for c compiles

cc out.c -lruby.so

Hope this helps!  Sorry I couldn't be more accurate.

Regards,
Brad

Ron Coutts wrote:

> > Here is what i get:
> >
> > Compiling...
> > out.c
> > Linking...
> > out.obj : error LNK2001: unresolved external symbol _ruby_init
> > out.obj : error LNK2001: unresolved external symbol _ruby_finalize
> > out.obj : error LNK2001: unresolved external symbol _rb_eval_string
> > Debug/out.exe : fatal error LNK1120: 3 unresolved externals
> > Error executing link.exe.
> >
> > out.exe - 4 error(s), 0 warning(s)
> >
> > Any ideas? Thanks,
>
> Isn't this just a C linker error?  I've never embedded ruby myself, but
> it seems there's a missing lib file containing the object code for
> functions ruby_init, ruby_finalize and rb_eval_string.
>
> Ron
>
>