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Re: cpp

From: "Terry Flannery" <terry dot flannery at btinternet dot com>
To: "Jeffrey C Knupp" <jknupp at andrew dot cmu dot edu>,<gcc-help at gcc dot gnu dot org>
Date: Mon, 12 Aug 2002 19:37:17 +0100
Subject: Re: cpp
References: <Pine.GSO.4.44L-027.0208121409140.10598-100000@unix4.andrew.cmu.edu>

Have a look at the -Wundef flag

Terry

----- Original Message -----
From: "Jeffrey C Knupp" <jknupp@andrew.cmu.edu>
To: <gcc-help@gcc.gnu.org>
Sent: Monday, August 12, 2002 7:13 PM
Subject: cpp


> To whoever sees this,
> I'm a student at Carnegie Mellon University and I've been using the
> preprocessor, cpp, from gcc-3.1. I was wondering if and why when a
previously undefined
> identifier in an #if is used, there is no warning given. For example, if
> the first line of my program is "#if Y" and Y has not been defined, it
> will not execute the code (obviously), but it also won't tell me that the
> identifier wasn't defined. I was wondering if this was done for a reason.
> Hopefully, someone can give me an answer.
>
> Thanks,
> Jeff Knupp
> Carnegie Mellon University
>

References:
- cpp
  - From: Jeffrey C Knupp

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