From: Shinku Fag <tinbka@...>
Date: 2010-06-04T09:48:11+09:00
Subject: Use a core C function not included in intern.h

Hello.

I trying to make a function with C extension for 1.8.7 that should use
functions defined in Ruby such as
>VALUE eval(VALUE,VALUE,VALUE,const char*,int)
But functions that aren't reflected (sorry, I don't know how to call it
better r_r) in intern.h, seems to be unusable. If I just add string
>VALUE eval _((VALUE,VALUE,VALUE,const char*,int));
to extension source or intern.h then I get
>symbol lookup error: /usr/lib/ruby/gems/1.8/gems/rmtools-1.0.0/lib/rmtools.so: undefined symbol: eval

So, is there a way to use such functions in the extension without
copypasting half the eval.c (and maybe even something else) into it?

Thanks.
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