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Re: Techniques to suppress "unused member variable" Clang warnings?

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Re: Techniques to suppress "unused member variable" Clang warnings?

Subject: Re: Techniques to suppress "unused member variable" Clang warnings?
From: James Bucanek <email@hidden>
Date: Mon, 7 Feb 2011 11:19:20 -0700

Jean-Daniel Dupas <mailto:email@hidden> wrote (Friday, February 4, 2011 1:54 AM +0100):

I don't know what the status of this feature in the last Xcode version, but
clang supports the unused attribute on obj-c ivar.

I have something like this to workaround this kind of warning:

#if __has_feature(attribute_objc_ivar_unused)
#define UNUSED_IVAR __attribute__((unused))
#else
#define UNUSED_IVAR
#endif

and then

@interface Foo {
int ivar UNUSED_IVAR;
}

@end

I finally got back to this, and I can confirm that this works perfectly in LLVM compiler 1.6 and LLVM GCC 4.2.

Thanks!

James Bucanek
____________________________________________________________________
Author of Professional Xcode 3                   ISBN: 9780470525227
<http://www.proxcode3.com/>
and Learn Objective-C for Java Developers        ISBN: 9781430223696
<http://objectivec4java.com/>

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