Xcode 4: Build Failed, No Issues

Question

The app works fine in the simulator, builds and runs.

When I attach my device (iPhone 3GS running iOS 4.3) and target the iPhone, the result is \"Build failed\" with

Answer 1

Go to Organizer in xcode. And in Project Tab, delete that project. Let xcode rebuild the derived data again fix my problem.

Answer 2

This happened to me with my UnitTest target. Was working and then stopped. I'd forgotten i'd just deleted a .h/.m on the file system and not removed it from the project file, however XCode didn't report it.

I figured it out by running the project on the command line, which told me the error:

/usr/bin/xcodebuild -target "UnitTest"

Run this in the folder you have your project file, and replace UnitTest with your target - or just don't pass in a target to build the default target.

Answer 3

I had this problem too, but the cause was a different one:

I have a workspace with one project in it. In this project I use a framework which is included by adding it's Xcode project to my project. I imported the framework's header file in my prefix header (.pch). This was stupid.

The solution was to remove the #import of the framework header file from my prefix header file and add it only where needed.

Answer 4

Same problem here when building for device. Build failed, but my log all is green checkmarks. Cleaning/deleting build folder doesn't fix it. I read elsewhere that someone solved this problem by deleting and recreating the target, but I haven't completely figured out how to do that yet in XCode 4.

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My temporary solution has been to download and install XCode 3.2.6 w/iOS 4.3. I didn't realized that Apple had also released a version of XCode 3 that includes iOS 4.3, allowing you to postpone the upgrade to XCode 4. I filed a bug report with Apple about the Build Failed issue.

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udpate from Apple:

When we build this project - albeit on a post-Xcode 4.0 version - we see the following in the ProcessProductPackaging step in the build log:

(null): error: CFBundleIdentifier 'com.yourcompany.Magic_Carpet' contains illegal character '_' invalid bundle identifier 'com.yourcompany.Magic_Carpet'

The ProcessProductPackaging code got an overhaul fairly recently, so we suspect it just wasn't emitting errors properly in Xcode 4.0. Take a look at the transcript of your own build, and if so, then this will likely be fixed in a future release of Xcode (we cannot comment further until a fix has been released).

I switched from an underscore to a dash and it fixed the problem.

Answer 5

Same thing just happened to me with a different cause.

I removed get-task-allow from my Entitlements.plist file, leaving an empty plist. Build settings still had Entitlements.plist file specified as my Entitlements file. Chose to run using my Ad-Hoc build settings on iOS device with my iPhone connected, and saw the behavior described in this bug. Adding get-task-allow back fixed it.

Answer 6

I just had a similar problem. Could not find an error anywhere. Deleted all my provisioning profiles and added new ones.

Then I tried building another test app to my device and I got this error message:

Code Sign error: Certificate identity 'iPhone Developer: xxxxxx' appears more than once in the keychain. The codesign tool requires there only be one.

So I went into Keychain, found a couple of expired certificates with the same name, and deleted them, and that did the trick.

Pretty random, but perhaps if you try building another app to the device like i did, you might be lucky enough to get an error message, as i did, to help diagnose the problem.