Generate BridgeSupport for headers at any level. This patch is needed

to ensure all headers of Pods will be included in the BS file, with
the current state of the motion-cocoapods repo.

lib/motion/project/vendor.rb

@@ -153,9 +153,9 @@ EOS
         bs_file = File.expand_path(File.basename(@path) + '.bridgesupport')
         headers_dir = opts.delete(:headers_dir)
         if !File.exist?(bs_file) and headers_dir
-          Dir.chdir(headers_dir) do
-            sh "/usr/bin/gen_bridge_metadata --format complete --no-64-bit --cflags \"-I.\" *.h -o \"#{bs_file}\""
-          end 
+          project_dir = File.expand_path(@config.project_dir)
+          headers = Dir.glob(File.join(project_dir, headers_dir, '**/*.h'))
+          BridgeSupport.new(headers).save_as(bs_file)
         end
 
         @bs_files = Dir.glob('*.bridgesupport').map { |x| File.expand_path(x) }
@@ -176,5 +176,24 @@ EOS
       raise "Invalid vendor project type: #{@type}" unless respond_to?(method)
       method
     end
+
+    class BridgeSupport
+      include Rake::DSL if Rake.const_defined?(:DSL)
+
+      attr_reader :headers
+
+      def initialize(headers)
+        @headers = headers
+      end
+
+      def search_paths
+        @headers.map { |header| "-I '#{File.dirname(header)}'" }.uniq
+      end
+
+      def save_as(path)
+        sh %{/usr/bin/gen_bridge_metadata --format complete --no-64-bit --cflags "#{search_paths.join(' ')}" -o '#{path}' '#{headers.join("' '")}'}
+      end
+    end
+
   end
 end; end