[Validator] Error when xcodebuild fails

CHANGELOG.md

@@ -4,6 +4,16 @@ To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides
 
 To install release candidates run `[sudo] gem install cocoapods --pre`
 
+## Master
+
+##### Bug Fixes
+
+* Ensure that linting fails if xcodebuild doesn't successfully build your Pod.  
+  [Kyle Fuller](https://github.com/kylef)
+  [#2981](https://github.com/CocoaPods/CocoaPods/issues/2981)
+  [cocoapods-trunk#33](https://github.com/CocoaPods/cocoapods-trunk/issues/33)
+
+
 ## 0.36.0.beta.1
 
 [CocoaPods](https://github.com/CocoaPods/CocoaPods/compare/0.35.0...0.36.0.beta.1)

lib/cocoapods/validator.rb

@@ -517,7 +517,15 @@ module Pod
     #
     def xcodebuild
       UI.puts 'xcodebuild clean build -target Pods' if config.verbose?
-      `xcodebuild clean build -target Pods 2>&1`
+      output = `xcodebuild clean build -target Pods 2>&1`
+
+      unless $?.success?
+        message = 'Returned a non-successful exit code.'
+        message += ' You can use `--verbose` for more information.' unless config.verbose?
+        error('xcodebuild', message)
+      end
+
+      output
     end
 
     #-------------------------------------------------------------------------#