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From "Ben Clayton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CB-754) Use of -weak_library in 'other library flags' of generated template XCode app causes crashes in Simulator when Obj-C Blocks are used
Date Fri, 11 May 2012 12:21:52 GMT
Ben Clayton created CB-754:
------------------------------

             Summary: Use of -weak_library in 'other library flags' of generated template
XCode app causes crashes in Simulator when Obj-C Blocks are used
                 Key: CB-754
                 URL: https://issues.apache.org/jira/browse/CB-754
             Project: Apache Cordova
          Issue Type: Bug
          Components: iOS
    Affects Versions: 1.7.0
         Environment: XCode 4.3.2 & iOS Simulator 5.1
            Reporter: Ben Clayton
            Assignee: Shazron Abdullah


Create an Xcode project using the Cordova 1.7 Template.

Open the MainViewController.m file, and overwrite the viewDidLoad method with:

- (void) viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    
    
    [UIView animateWithDuration:0.75
                     animations:^{
                         self.view.alpha = 0.5;
                         self.view.alpha = 1.0;
                     }
                    completion:^(BOOL finished){ 
                        NSLog(@"Complete");
                    }];

}

Run app in the iPhone simulator.
App crashes with EXC_BAD_ACCESS (code=2 address 0x0) on line beginning [UIView ..

Solution:

Alter the build settings 'Other linker flags' for main target.
- Remove -weak_library
- Replace with -weak-lSystem

Re-build, app no longer crashes. Note that it works on the device regardless of this setting.

Suggest template includes this change.

This stackoverflow post describes the problem in more detail:
http://stackoverflow.com/questions/6738858/use-of-blocks-crashes-app-in-iphone-simulator-4-3-xcode-4-2-and-4-0-2




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