WIP: Support for defining pods per build config

This is not even nearly functional, I'm just prodding pieces of code to
see how it works.

lib/cocoapods/generator/xcconfig/aggregate_xcconfig.rb

@@ -11,9 +11,11 @@ module Pod
       attr_reader :target
 
       # @param  [Target] target @see target
+      # @param  [String] build_config Name of the build config to generate this xcconfig for
       #
-      def initialize(target)
+      def initialize(target, build_config)
         @target = target
+        @build_config = build_config
       end
 
       # @return [Xcodeproj::Config] The generated xcconfig.
@@ -54,6 +56,8 @@ module Pod
         })
 
         target.pod_targets.each do |pod_target|
+          next unless pod_target.include_in_build_config? @build_config
+
           pod_target.file_accessors.each do |file_accessor|
             XCConfigHelper.add_spec_build_settings_to_xcconfig(file_accessor.spec_consumer, @xcconfig)
             file_accessor.vendored_frameworks.each do |vendored_framework|

lib/cocoapods/installer/target_installer/aggregate_target_installer.rb

@@ -32,15 +32,14 @@ module Pod
       # @return [void]
       #
       def create_xcconfig_file
-        path = library.xcconfig_path
-        UI.message "- Generating xcconfig file at #{UI.path(path)}" do
-          gen = Generator::XCConfig::AggregateXCConfig.new(library)
-          gen.save_as(path)
-          library.xcconfig = gen.xcconfig
-          xcconfig_file_ref = add_file_to_support_group(path)
-
-          target.build_configurations.each do |c|
-            c.base_configuration_reference = xcconfig_file_ref
+        target.build_configurations.each do |build_config|
+          path = library.xcconfig_path build_config
+          UI.message "- Generating #{build_config.name} xcconfig file at #{UI.path(path)}" do
+            gen = Generator::XCConfig::AggregateXCConfig.new(library, build_config)
+            gen.save_as(path)
+            library.xcconfigs[build_config.name] = gen.xcconfig
+            xcconfig_file_ref = add_file_to_support_group(path)
+            build_config.base_configuration_reference = xcconfig_file_ref
           end
         end
       end

lib/cocoapods/target.rb

@@ -79,8 +79,8 @@ module Pod
 
     # @return [Pathname] the absolute path of the xcconfig file.
     #
-    def xcconfig_path
-      support_files_root + "#{label}.xcconfig"
+    def xcconfig_path variant
+      support_files_root + "#{label}-#{variant}.xcconfig"
     end
 
     # @return [Pathname] the absolute path of the private xcconfig file.

lib/cocoapods/target/aggregate_target.rb

@@ -13,6 +13,7 @@ module Pod
       @sandbox = sandbox
       @pod_targets = []
       @file_accessors = []
+      @xcconfigs = {}
     end
 
     # @return [String] the label for the target.
@@ -44,13 +45,14 @@ module Pod
     #
     attr_accessor :user_target_uuids
 
-    # @return [Xcodeproj::Config] The configuration file of the target.
+    # @return [Hash<String, Xcodeproj::Config>] Map from configuration name to configuration file for the target
     #
-    # @note   The configuration is generated by the {TargetInstaller} and
+    # @note   The configurations are generated by the {TargetInstaller} and
     #         used by {UserProjectIntegrator} to check for any overridden
     #         values.
     #
-    attr_accessor :xcconfig
+    attr_reader :xcconfigs
+
 
     # @return [Array<PodTarget>] The dependencies for this target.
     #
@@ -90,11 +92,12 @@ module Pod
       "${SRCROOT}/#{support_files_root.relative_path_from(client_root)}"
     end
 
+    # @param  [String] config_name The build configuration name to get the xcconfig for
     # @return [String] The path of the xcconfig file relative to the root of
     #         the user project.
     #
-    def xcconfig_relative_path
-      relative_to_srcroot(xcconfig_path).to_s
+    def xcconfig_relative_path config_name
+      relative_to_srcroot(xcconfig_path, config_name).to_s
     end
 
     # @return [String] The path of the copy resources script relative to the

lib/cocoapods/target/pod_target.rb

@@ -64,5 +64,11 @@ module Pod
       end.flatten
     end
 
+    # @param [String] build_config Name of the build configuration that caller is unsure if this target should
+    #                 be linked with.
+    def include_in_build_config? build_config
+      true
+    end
+
   end
 end