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Re: How to tell whether an executable supports GC?

Subject: Re: How to tell whether an executable supports GC?
From: André Pang <email@hidden>
Date: Sat, 9 Aug 2008 11:32:30 +1000
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On 08/08/2008, at 3:18 PM, Chris Suter wrote:

You want to look at the __image_info section in the __OBJC segment:

struct objc_image_info  {
 uint32_t	version;	// initially 0
 uint32_t	flags;
};

#define OBJC_IMAGE_SUPPORTS_GC   2
#define OBJC_IMAGE_GC_ONLY       4

Thanks for the heads-up Chris! Thanks to your tip, I settled for a rather cheap solution that works just fine for me:

/usr/bin/otool -o $PATH | grep -q -2 '__OBJC.__image_info' | grep GC

:)

I'm not 100% sure that otool's installed without the BSD subsystem being available, but I think that's mandatory now with Leopard. The GC check is just used for displaying some extra informative text in a sheet (which plugins aren't GC supported), so if anything fails, it's not a disaster. I figured it'd be easier than trying to find some libraries to read in the Mach-O format... considering the tininess of the problem, it was far too much effort!


--
% Andre Pang : trust.in.love.to.save  <http://www.algorithm.com.au/>

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References:
	>How to tell whether an executable supports GC? (From: André Pang <email@hidden>)
	>Re: How to tell whether an executable supports GC? (From: "Chris Suter" <email@hidden>)

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