[TargetIntegrator] Migrate weak-linked integrations

lib/cocoapods/installer/user_project_integrator/target_integrator.rb

@@ -137,6 +137,30 @@ module Pod
           end
         end
 
+        # Reset the linking of the product reference to strong.
+        #
+        # @return [Bool] whether any changes to the project were made.
+        #
+        # @todo   This can be removed for CocoaPods 1.0
+        #
+        def update_to_cocoapods_0_40
+          frameworks = user_project.frameworks_group
+          native_targets_to_embed_in.any? do |native_target|
+            build_phase = native_target.frameworks_build_phase
+
+            product_ref = frameworks.files.find { |f| f.path == target.product_name }
+            if product_ref
+              build_file = build_phase.build_file(product_ref)
+              if build_file \
+                && build_file.settings.is_a?(Hash) \
+                && build_file.settings['ATTRIBUTES'].is_a?(Array) \
+                && build_file.settings['ATTRIBUTES'].include?('Weak')
+                build_file.settings = nil
+              end
+            end
+          end
+        end
+
         # Adds spec product reference to the frameworks build phase of the
         # {TargetDefinition} integration libraries. Adds a file reference to
         # the frameworks group of the project and adds it to the frameworks

spec/unit/installer/user_project_integrator/target_integrator_spec.rb

@@ -47,6 +47,17 @@ module Pod
           phase.shell_script.strip.should == "\"${SRCROOT}/../Pods/Target Support Files/Pods/Pods-resources.sh\""
         end
 
+        it 'fixes the "Link binary with libraries" build phase of legacy installations' do
+          @pod_bundle.stubs(:requires_frameworks? => true)
+          @target_integrator.integrate!
+          target = @target_integrator.send(:native_targets).first
+          phase = target.frameworks_build_phase
+          build_file = phase.files.find { |f| f.file_ref.path == 'Pods.framework' }
+          build_file.settings = { 'ATTRIBUTES' => %w(Weak) }
+          @target_integrator.integrate!
+          build_file.settings.should.be.nil
+        end
+
         it 'adds references to the Pods static libraries to the Frameworks group' do
           @target_integrator.integrate!
           @target_integrator.send(:user_project)['Frameworks/libPods.a'].should.not.be.nil