Re: Can Xcode allow multiple definitions of a fn?
Re: Can Xcode allow multiple definitions of a fn?
- Subject: Re: Can Xcode allow multiple definitions of a fn?
- From: James Housley <email@hidden>
- Date: Fri, 16 Sep 2005 10:22:12 -0400
Matt Neuburg wrote:
On Wed, 14 Sep 2005 13:08:34 -0700, Ando Sonenblick
<email@hidden> said:
I'm porting a bunch of static libs from CW to Xcode and they share
various code bits (not my code/design). As a result, when I have a
project that includes these libs, Xcode gives errors that there are
multiple definitions of these duplicate functions.
Okay, I've got a related question (I think it's related). I get "multiple
definitions" errors when I place a #define macro in the pre-compiled header
file. For example I have a MyLog macro that expands to NSLog ifdef DEBUG but
to nothing othewise, so that I log only in a debug build:
#ifdef DEBUG
#define MyLog(format, args...) \
<and so on>
This used to work fine, but now I'm getting these multiple definition
errors. Did something about the precompilation process change that could be
causing this? How do I properly do this #define so that all of my code can
see it? Thx - m.
One simple fix which is very common in header files is ...
#ifdef DEBUG
#ifndef MyLog
#define MyLog(format, args...) \
<and so on>
#endif /* MyLog */
So that it will only be defined if it isn't already defined.
Jim
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