xcodebuild task doesn't fail build on compiler errors

[max-potapov]

steps to reproduce:

git clone https://github.com/max-potapov/GradleApp.git # download sample project
cd GradleApp && ./gradlew xcodebuild # run wrapper

log:

/Users/max/devel/GradleApp/GradleApp/ViewController.m:10:9: fatal error: 'BuildFailure.h' file not found
#import "BuildFailure.h"
        ^
1 error generated.

** BUILD FAILED **


The following build commands failed:
    CompileC build/obj/GradleApp.build/Debug-iphonesimulator/GradleApp.build/Objects-normal/i386/ViewController.o GradleApp/ViewController.m normal i386 objective-c com.apple.compilers.llvm.clang.1_0.compiler
(1 failure)

Done
:xcodebuild (Thread[main,5,main]) completed. Took 2.347 secs.
:keychainRemove (Thread[main,5,main]) started.
:keychainRemove
Executing task ':keychainRemove' (up-to-date check took 0.0 secs) due to:
  Task has not declared any outputs.
    "/Users/max/Library/Keychains/login.keychain"
    "/Library/Keychains/System.keychain"
:keychainRemove (Thread[main,5,main]) completed. Took 0.026 secs.

BUILD SUCCESSFUL

Total time: 5.725 secs

This build could be faster, please consider using the Gradle Daemon: http://gradle.org/docs/2.4/userguide/gradle_daemon.html