"[Specification] Allow to require_arc in subspecs."

Closes #464.

lib/cocoapods/specification.rb

@@ -51,8 +51,9 @@ module Pod
           compiler_flags ].each do |attr|
         instance_variable_set( "@#{attr}", { :ios => [], :osx => [] } )
       end
-      @xcconfig = { :ios => Xcodeproj::Config.new, :osx => Xcodeproj::Config.new }
-      @header_dir = { :ios => nil, :osx => nil }
+      @xcconfig     = { :ios => Xcodeproj::Config.new, :osx => Xcodeproj::Config.new }
+      @header_dir   = { :ios => nil, :osx => nil }
+      @requires_arc = { :ios => nil, :osx => nil }
 
       yield self if block_given?
     end
@@ -137,6 +138,7 @@ module Pod
           compiler_flags=
           deployment_target=
           header_dir=
+          requires_arc
           dependency }.each do |method|
         define_method(method) do |args|
           @specification._on_platform(@platform) do
@@ -194,7 +196,6 @@ module Pod
     top_attr_accessor :homepage
     top_attr_accessor :summary
     top_attr_accessor :documentation
-    top_attr_accessor :requires_arc
     top_attr_accessor :version,             lambda { |v| Version.new(v) }
 
     top_attr_reader   :description,         lambda { |instance, ivar| ivar || instance.summary }
@@ -255,6 +256,24 @@ module Pod
     alias_method :weak_framework=,  :weak_frameworks=
     alias_method :library=,         :libraries=
 
+
+    # @!method requires_arc=
+    #
+    # @abstract Wether the `-fobjc-arc' flag should be added to the compiler
+    #   flags.
+    #
+    # @param [Bool] Wether the source files require ARC.
+    #
+    platform_attr_writer :requires_arc
+
+    def requires_arc
+      requires_arc = @requires_arc[active_platform]
+      if requires_arc.nil?
+        requires_arc = @parent ? @parent.requires_arc : false
+      end
+      requires_arc
+    end
+
     # @!method header_dir=
     #
     # @abstract The directory where to name space the headers files of

spec/unit/specification_spec.rb

@@ -305,6 +305,7 @@ describe "A Pod::Specification subspec" do
 
         fss.subspec 'SecondSubSpec' do |sss|
           sss.source_files = 'subsubspec.m'
+          sss.requires_arc = false
         end
       end
     end
@@ -329,7 +330,7 @@ describe "A Pod::Specification subspec" do
 
   it "automatically forwards top level attributes to the top level parent" do
     @spec.activate_platform(:ios)
-    [:version, :license, :authors, :requires_arc, :compiler_flags].each do |attr|
+    [:version, :license, :authors, :compiler_flags].each do |attr|
       @spec.subspecs.first.send(attr).should == @spec.send(attr)
       @spec.subspecs.first.subspecs.first.send(attr).should == @spec.send(attr)
     end
@@ -346,6 +347,13 @@ describe "A Pod::Specification subspec" do
     @subsubspec.compiler_flags.should == ' -fobjc-arc -Wdeprecated-implementations'
   end
 
+  it "allows to specify arc settings for subspecs" do
+    @spec.activate_platform(:ios)
+    @spec.requires_arc.should == true
+    @subspec.requires_arc.should == true
+    @subsubspec.requires_arc.should == false
+  end
+
   it "returns empty arrays for chained attributes with no value in the chain" do
     @spec = Pod::Spec.new do |s|
       s.name         = 'MainSpec'