Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!amdahl!uunet!bywater!scifi!ndla!platt
From: platt@ndla.UUCP (Daniel E. Platt)
Newsgroups: comp.lang.c
Subject: Re: AT&T C compilers
Summary: Several C Standards
Keywords: C compiler,bug?
Message-ID: <199@ndla.UUCP>
Date: 26 Feb 89 04:04:04 GMT
References: <569@marob.MASA.COM>
Lines: 26

In article <569@marob.MASA.COM>, samperi@marob.MASA.COM (Dominick Samperi) writes:
> The AT&T C compiler (from System V, Release 2?) chokes on a declaration
> of the form:
> 
> extern int bob(double (*)()) ;
> 
> On the other hand, it is accepted by Microsoft C and other C compilers.
> The AT&T C++ translator also chokes on this. Is this declaration 
> incorrect, or have I been bitten by a compiler bug?


The declaration you made corresponds to the ANSI standard, where arguement
type checking is legal.  In the K&R standard, as well as in C++, type checking
of this kind is NOT standard.  You haven't found a bug, just a problem with the
various standards that are now floating around.

What you need to do is to declare

	extern int bob();

and you need to make sure that the type passed and received are the same (very
sure, or it won't work!!!).

Hope this helps!

Dan Platt