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From: tuck@jason.cs.unc.edu (Russ Tuck)
Newsgroups: comp.lang.c++
Subject: Re: C++2.0 upgrade from 1.2.?
Keywords: darnit..
Message-ID: <12824@thorin.cs.unc.edu>
Date: 21 Mar 90 23:58:11 GMT
References: <12801@thorin.cs.unc.edu>
Sender: news@thorin.cs.unc.edu
Reply-To: tuck@jason.cs.unc.edu (Russ Tuck)
Organization: University Of North Carolina, Chapel Hill
Lines: 20

In article <12801@thorin.cs.unc.edu> frederic@vangogh.cs.unc.edu (Robin Fredericksen) writes:
>I am upgrading some software from C++1.2.? to C++2.0.  It seems that
>there is something missing.  At link time I get the message
>
>	Undefined:
>	__ptbl__9ih_editor__ih_editor_c
>	*** Error code 1

Does your C++ program call a routine named "ih_editor" that was compiled
with plain C?  If so, you need to put the declaration of "ih_editor" that
C++ sees inside the {}s of

  extern "C" {    }

Just a guess.  One of the main changes from 1.2 to 2.0 is type-safe
linking, which means encoding argument types in the mangled names of
functions to be sure the calls and the definition match (even when
compiled separately) and to support overloading better.  To call 
something C compiled, you have to tell C++ that C didn't mangle the
name.