On Wed, Jun 11, 2008 at 12:12 PM, Charles Srstka <[EMAIL PROTECTED]> wrote: > On Jun 11, 2008, at 10:49 AM, Sherm Pendley wrote: > >> Check the libraries with otool. Runtime dependencies come from the >> install_name of the linked library, not from the filename that was >> passed to the linker. > > In which case it shouldn't matter at all whether Xcode is resolving the > symlink or not, no?
Yes, in fact it does matter. If Xcode resolves the symlink and stores a direct reference to libz1.dylib, then it will continue to use that even if you later move to a newer SDK with a newer version of libz. When ld resolves the symlink, it does so each time you build, so you'll always get the correct version for the SDK you're using. >> That's why (well - one reason why) you need to use the SDK that >> corresponds to the oldest version of Mac OS X on which your app will >> run. If you use a newer SDK, the symlink will resolve differently and >> you'll end up linking to a library that isn't available on older OS >> versions. > > The problem comes up when you want to use a method that's only available on > 10.4 and higher (checking the OS version first so that you can gracefully > degrade on 10.3.x), or when Apple decides to deprecate a whole bunch of > methods in 10.4 and replace them with methods that are only available > starting in 10.4, in which case you have to use the 10.4 methods inside OS > checks to avoid using deprecated methods on the current OS. My solution for that is simple. I don't want to write my code twice, so if I want to support 10.3, I write it using methods that are available on that version. And if I need to use methods that *aren't* available on 10.3 - or an entirely new framework, such as Core Data - I don't even try to support 10.3. > Well, I suppose you could ugly the code up with a lot of performSelector: > and NSInvocation and such, but I'd rather not do that. Or, you could simply avoid the methods that aren't available on your target OS. :-) sherm-- -- Cocoa programming in Perl: http://camelbones.sourceforge.net _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
