[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

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.7.0
• Fix Version/s: 1.8.0
• Component/s: cordova-ios
• Labels: crash objective-c template xcode

Environment

XCode 4.3.2 & iOS Simulator 5.1

• Assignee: Shazron Abdullah
• Reporter: Ben Clayton
• Created: 11/May/12 12:20
• Updated: 23/Aug/18 07:47
• Resolved: 11/May/12 23:15

Description

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