Mailing Lists: Apple Mailing Lists

Image of Mac OS face in stamp
 
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: How to tell whether an executable supports GC?



You can also create your own helper tool compiled with GC support and, that just preflight the bundle you pass as argument and return the result.
It's a little more works, but it's cleaner too.



Le 9 août 08 à 03:32, André Pang a écrit :

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/>



_______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/email@hidden

This email sent to email@hidden


_______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/email@hidden

This email sent to email@hidden
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>)
 >Re: How to tell whether an executable supports GC? (From: André Pang <email@hidden>)



Visit the Apple Store online or at retail locations.
1-800-MY-APPLE

Contact Apple | Terms of Use | Privacy Policy

Copyright © 2007 Apple Inc. All rights reserved.