I have a project which I am compiling under OS X 10.7.4 using Xcode 4.4.1
I am using Base SDK SDKROOT macosx10.7 I have set Deployment Target MACOSX_DEPLOYMENT_TARGET 10.6
I tested a recent build on Snow Leopard and it crashed. Previous builds using Xcode 4.2 and 4.3 did work, and I can compile on Snow Leopard using Xcode version 3.2.6
Has anyone else had this experience, or better know what I can do to resolve it?
OS Version: Mac OS X 10.6.8 (10K549)
Report Version: 6
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000030
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Application Specific Information:
objc[274]: garbage collection is ON
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 com.apple.AppKit -[NSImage _allocAuxiliaryStorage] + 158
1 com.apple.AppKit -[NSImage copyWithZone:] + 66
2 libobjc.A.dylib objc_setProperty + 82
3 -[TreeViewController(Dirs) outlineView:willDisplayCell:forTableColumn:item:] + 207
PS Just restored Xcode 4.2.1 from TimeMachine backup and the build works on Snow Leopard
I "upgraded" to Mountain Lion - which would not allow Xcode 4.2.1 to run. (This also seemed to delete the OSX 10.8 and Xcode 4.4 SDK and the command line tools :-( ). This made it impossible to just use the precious compiler.
I tried to follow up where the crash was happening, which appeared to be in a call to setNodeIcon which was defined in one of my classes as
@property (copy) NSImage *nodeIcon;
I realise I will have to convert to ARC eventually, but was reluctant to embark on this yet. The conversion was far from straightforward and I am not sure I understand all the changes I was required to make (one file at a time) in particular the Toll-Free Bridging changes.
The resultant ARC code does seem to work on 10.6 - 10.8 but I need to do a lot of regression and leak testing to confirm.
Updated Comments 2012-09-18
The ARC code works but I found a couple of problems (which I have resolved) but need to do a lot more.
I went back to my GC code and changed copy to assign. This seemed to work.
@property (assign) NSImage *nodeIcon;
Just to confirm I made a standalone app (see below) which does nothing but copy an NSImage. This crashed in the same way, so it seems to be a bug in the compiler.
#import <Cocoa/Cocoa.h>
@interface AppDelegate : NSObject <NSApplicationDelegate> {
NSImage *nodeIcon;
}
@property (assign) IBOutlet NSWindow *window;
@property (copy) NSImage *nodeIcon;
@end
#import "AppDelegate.h"
@implementation AppDelegate
@synthesize nodeIcon;
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
NSString *defaultDirectory = NSHomeDirectory();
[self setNodeIcon:[[NSWorkspace sharedWorkspace] iconForFile:defaultDirectory]];
}
@end
