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PORunning xcodebuild twice from a Cocoa app (via NSTask) silently fails
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copied!<p>I have a Cocoa app that does a number of things, but among them, uses '<code>xcodebuild</code>' to clean and re-build a iOS project in XCode. The Cocoa app was developed using XCode 4.1, and runs only on OS X 10.7 (because of the NSTask termination handlers). I hadn't touched it for a few months, and after I had upgraded to XCode 4.2 I found that only the first NSTask that ran xcodebuild actually did anything. Subsequent calls do nothing.</p> <p>Some details:</p> <ul> <li>The iOS project being built sits within the resource bundle of the Cocoa app. So basically, the Cocoa app is a wrapper for an iOS project. Imagine a GUI with a big red button that says: "Build me an iOS app!"</li> <li>This code worked perfectly in XCode 4.1. Task 1 executed, then in the termination handler for task 1, task 2 was called, and ran just fine. The problem is that task 2 no longer runs at all.</li> <li>I have since upgraded to xcode 4.3, which required me to also install the standalone Xcode command line tools. The code still doesn't work properly though.</li> <li>I can run both the '<code>xcodebuild clean</code>' and '<code>xcodebuild</code>' commands in Terminal with no problems.</li> </ul> <p>Below is a (paraphrased) version of the offending code.</p> <pre><code>#import "AppDelegate.h" @implementation AppDelegate @synthesize window = _window; - (void)applicationDidFinishLaunching:(NSNotification *)aNotification { [self runTaskOne]; } // Clean the iOS Project - (void) runTaskOne { NSTask *task = [[NSTask alloc] init]; [task setCurrentDirectoryPath:@".../myproject/DerivedData/myproject/Build/Products/Debug/myproject.app/Contents/Resources/iOSProjectFolder"]; [task setLaunchPath:@"/usr/bin/xcodebuild"]; [task setArguments:[NSArray arrayWithObjects:@"clean", nil]]; [task setTerminationHandler:^(NSTask *task) { [self runTaskTwo]; }]; [task launch]; } // Build the same iOS project that was just cleaned - (void) runTaskTwo; { NSTask *task = [[NSTask alloc] init]; [task setCurrentDirectoryPath:@".../myproject/DerivedData/myproject/Build/Products/Debug/myproject.app/Contents/Resources/iOSProjectFolder"]; [task setLaunchPath:@"/usr/bin/xcodebuild"]; [task launch]; } @end </code></pre> <p>So just to re-iterate: Task 1 (the clean) works fine. Task 2 (the build) doesn't even seem launch. This behaviour is only observed after upgrading to XCode 4.2. I must be doing something wrong, but what?</p>

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