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Re: How to get a literal #undef into config.h

From: Bruce Korb
Subject: Re: How to get a literal #undef into config.h
Date: Tue, 25 Oct 2005 12:06:30 -0700
User-agent: Mozilla Thunderbird 1.0.2 (Windows/20050317)

Keith Marshall wrote:
On Tuesday 25 October 2005 3:45 pm, Brian wrote:

Great thanks for the tips. I see its a bit chicken and egg, but is there a
reason config.h couldn't just define HAVE_CONFIG_H?

Because your source file is expected to use logic like this:--

  #ifdef  HAVE_CONFIG_H
  #include "config.h"

so if it isn't defined on the command line, config.h will never get the chance to define *anything*.

OTOH, if your project flat won't work on any platform without config.h:

  #ifndef HAVE_CONFIG_H
  #define HAVE_CONFIG_H 1
  #include "config.h"  // include it or die trying, instead of some obtuse
                       // error stemming from incorrect data declarations


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