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

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.