On Mar 7, 2014, at 4:54 AM, Bill Cheeseman <wjcheese...@gmail.com> wrote: > > My code calls -[NSArray objectAtIndex:]. I compile it with Xcode 5.0.2 on OS > X 10.9.x Mavericks in a project with the target's Base SDK set to 10.9 and > the OS X Deployment Target set to OS X 10.7. It works fine when I run it on > OS X 10.9 or OS X 10.8. > > However, when I run it on Mac OS X 10.7 Lion, I get a runtime error claiming > it encountered an invalid argument, namely, the unrecognized selector > -objectAtIndexedSubscript:. The NSArray Class Reference notes that > -objectAtIndexedSubscript: is available only in OS X 10.8 and later, and that > it is "identical to objectAtIndex:". Of course, -objectAtIndex: still exists > in the 10.9 API, and it is not marked as deprecated. > > It appears, therefore, that the compiler generated a call to > -objectAtIndexedSubscript: even though my source specifies -objectAtIndex: > and a deployment version of 10.7. > > Has anyone else encountered this? -- I don't find anything in my searches. It > seems like a serious bug that would have cropped up for practically everybody.
-objectAtIndexedSubscript: is what the compiler generates when it sees square-bracket indexing syntax applied to an NSArray: NSArray *a = …; foo(a[0]); // generates call to -objectAtIndexedSubscript: It’s unfortunate that the compiler doesn’t catch that you’re targeting 10.7, where this method does not exist, and prevent such syntax. > > My actual code is this: > > NSString *rootPath = > [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSSystemDomainMask, > YES) objectAtIndex:0]; This doesn’t look like the code that’s breaking. Is that really what’s on the stack when you crash? If so, that’s a pretty serious compiler bug. > > I could try casting the result of NSSearchPathForDirectoriesInDomains() to > type NSArray* or break this statement into two parts with an intermediate > NSArray local variable, but I can't see why that would make any difference. > > Is there any way to work around this? > > I notice that the 10.7 Lion SDK is not part of the Xcode 5 installation. Do I > have to add the 10.7 Lion SDK? -- and how would I go about doing that? The Lion SDK is not supported with Xcode 5. --Kyle Sluder _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
