Re: Garbage Collection OFF By Default?
Re: Garbage Collection OFF By Default?
- Subject: Re: Garbage Collection OFF By Default?
- From: "David H. Silber" <email@hidden>
- Date: Thu, 11 Dec 2008 00:06:32 -0500
On Wed, Dec 10, 2008 at 09:36:49PM -0800, Chris Espinosa wrote:
> On Dec 10, 2008, at 8:16 PM, David H. Silber wrote:
>
> >With a "Cocoa Application" project newly created with Xcode 3.1.2, I
> >notice that Garbage Collection is set to "Unsupported". This
> >surprises
> >me as I would think that GC would be preferable for all applications
> >but
> >the most performance-critical. Can anyone speak knowledgeably about
> >why
> >that is the default and what downsides there would be to turning it
> >on?
> >
> >I note that some Objective-C 2.0 features are not available for 32-bit
> >platforms, but I haven't seen anything that would suggest that GC is
> >one
> >of those features.
> >
> >(Leopard on a G4, if that makes a difference.)
> >
> >For others who might want to play along at home, the setting is hiding
> >in:
> > Project --> Edit Project Settings --> Build -->
> > GCC 4.0 - Code Generation --> Objective-C Garbage Collection
> >Configuration is set to: "Active (Debug)"
>
> Because most extant documentation teaches how to write a retain/
> release style app, we're not comfortable (in Leopard) pulling the rug
> out from under novices by making their first project use an entirely
> different memory management system than they read about in the Cocoa
> books. For now, Garbage Collection is opt-in.
Thank you for that explanation.
> Two notes about your suggestion:
>
> 1) You can indeed set it at the project level, but because any setting
> at the Target level will supersede, most people make substantive code-
> model settings like this on the Target, for reliability.
> 2) If you set GC you ought to set it for all configurations. It would
> be somewhat disheartening to debug your GC code then ship a non-GC
> version that ends up leaking.
Thank you for clueing me in. I threw that path in because I spent a
non-trivial amount of time searching for the GC setting and hoped to
save someone else that pain. Your notes will undoubtably save me a
week's worth of pulling my hair out sometime in the future.
David
--
David H. Silber -- http://DavidSilber.name/
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