Manually build dependencies with xcodebuild

The xcodebuild -target <target> invocation does not support implicit 
dependencies.  Therefor building the Pods integration library fails 
because none of the spec libraries are built.  Building a scheme 
results in proper implicit dependency resolution, but there are no 
schemes created in the integration tests.  Just walk the list of 
spec libraries and manually build all dependencies before building 
the Pod integration library.

spec/integration_spec.rb

@@ -13,15 +13,21 @@ end
 
 puts " [!] ".red << "Skipping xcodebuild based checks, because it can't be found." if skip_xcodebuild?
 
-def should_xcodebuild(target_definition)
+# Build targets in the Pods project with xcodebuild.  The xcodebuild -target
+# option does not support implicit dependency resolution, so all integration
+# library dependencies, the pod libraries for each target definition, must be
+# explicitly built first.
+#
+def should_xcodebuild(target)
   return if skip_xcodebuild?
-  target = target_definition
   Dir.chdir(config.sandbox_root) do
-    print "[!] Compiling #{target.label}...\r"
-    should_successfully_perform "xcodebuild -target '#{target.label}'"
-    product_name = "lib#{target_definition.label}.a"
-    lib_path = config.sandbox_root + "build/Release#{'-iphoneos' if target.platform == :ios}" + product_name
-    `lipo -info '#{lib_path}'`.should.include "#{target.platform == :ios ? 'armv7' : 'x86_64'}"
+    libraries = target.libraries + [target] # Build the integration library last
+    libraries.each do |library|
+      print "[!] Compiling #{library.label}...\r"
+      should_successfully_perform "xcodebuild -target '#{library.label}'"
+      lib_path = config.sandbox_root + "build/Release#{'-iphoneos' if target.platform == :ios}" + library.product_name
+      `lipo -info '#{lib_path}'`.should.include "#{library.platform == :ios ? 'armv7' : 'x86_64'}"
+    end
   end
 end
 
@@ -81,8 +87,10 @@ module Pod
       ]
       lockfile['DEPENDENCIES'].should == ["ASIHTTPRequest (= 1.8.1)", "JSONKit (= 1.4)"]
 
-      should_xcodebuild(podfile.target_definitions[:ios_target])
-      should_xcodebuild(podfile.target_definitions[:osx_target])
+      ios_target = installer.targets.select { |t| t.target_definition == podfile.target_definitions[:ios_target] }.first
+      osx_target = installer.targets.select { |t| t.target_definition == podfile.target_definitions[:osx_target] }.first
+      should_xcodebuild(ios_target)
+      should_xcodebuild(osx_target)
     end
 
     #--------------------------------------#