From: "Terry Flannery" <terry.flannery@btinternet.com>
To: "Jeffrey C Knupp" <jknupp@andrew.cmu.edu>, <gcc-help@gcc.gnu.org>
Subject: Re: cpp
Date: Mon, 12 Aug 2002 11:37:00 -0000 [thread overview]
Message-ID: <000b01c2422f$4abe5940$c700a8c0@sknet01> (raw)
In-Reply-To: <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
>
prev parent reply other threads:[~2002-08-12 18:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-12 11:13 cpp Jeffrey C Knupp
2002-08-12 11:37 ` Terry Flannery [this message]
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