* cpp
@ 2002-08-12 11:13 Jeffrey C Knupp
2002-08-12 11:37 ` cpp Terry Flannery
0 siblings, 1 reply; 2+ messages in thread
From: Jeffrey C Knupp @ 2002-08-12 11:13 UTC (permalink / raw)
To: gcc-help
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: cpp
2002-08-12 11:13 cpp Jeffrey C Knupp
@ 2002-08-12 11:37 ` Terry Flannery
0 siblings, 0 replies; 2+ messages in thread
From: Terry Flannery @ 2002-08-12 11:37 UTC (permalink / raw)
To: Jeffrey C Knupp, gcc-help
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
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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