[PodTarget] Ensure that subspecs are on the same configurations

lib/cocoapods/target/pod_target.rb

@@ -71,8 +71,33 @@ module Pod
     #         The name of the build configuration.
     #
     def include_in_build_config?(configuration_name)
-      @target_definition.pod_whitelisted_for_configuration?(pod_name, configuration_name)
+      whitelists = target_definition_dependencies.map do |dependency|
+        target_definition.pod_whitelisted_for_configuration?(dependency.name, configuration_name)
+      end.uniq
+
+      if whitelists.empty?
+        return true
+      elsif whitelists.count == 1
+        whitelists.first
+      else
+        raise Informative, "The subspecs of `#{pod_name}` are linked to " \
+          "different build configurations for the `#{target_definition}` " \
+          "target. CocoaPods does not support subspecs across different " \
+          "build configurations."
+      end
     end
 
+    private
+
+    # @return [Array<Dependency>] The dependency of the target definition for
+    #         this Pod. Return an empty array if the Pod is not a direct
+    #         dependency of the target definition but the dependency of one or
+    #         more Pods.
+    #
+    def target_definition_dependencies
+      target_definition.dependencies.select do |dependency|
+        Specification.root_name(dependency.name) == pod_name
+      end
+    end
   end
 end

spec/unit/target/pod_target_spec.rb

@@ -37,6 +37,27 @@ module Pod
       it "returns the name of the Pods on which this target depends" do
         @pod_target.dependencies.should == ["monkey"]
       end
+
+      it "returns whether it is whitelisted in a build configuration" do
+        @target_definition.store_pod('BananaLib')
+        @target_definition.whitelist_pod_for_configuration('BananaLib', 'debug')
+        @pod_target.include_in_build_config?('Debug').should.be.true
+        @pod_target.include_in_build_config?('Release').should.be.false
+      end
+
+      it "is whitelisted on all build configurations of it is a dependency of other Pods" do
+        @pod_target.include_in_build_config?('Debug').should.be.true
+        @pod_target.include_in_build_config?('Release').should.be.true
+      end
+
+      it "raises if a Pod is whitelisted for different build configurations" do
+        @target_definition.store_pod('BananaLib')
+        @target_definition.store_pod('BananaLib/Subspec')
+        @target_definition.whitelist_pod_for_configuration('BananaLib', 'debug')
+        should.raise Informative do
+          @pod_target.include_in_build_config?('release').should.be.true
+        end.message.should.match /subspecs across different build configurations/
+      end
     end
 
     describe "Support files" do