Merge pull request #1596 from swizzlr/system_header_warning_inhibition

Inhibit warnings by adding search paths as system headers.

.gitmodules

@@ -19,4 +19,4 @@
 	url = https://github.com/tonymillion/Reachability.git
 [submodule "spec/cocoapods-integration-specs"]
 	path = spec/cocoapods-integration-specs
-	url = https://github.com/CocoaPods/cocoapods-integration-specs
+	url = https://github.com/CocoaPods/cocoapods-integration-specs.git

lib/cocoapods/generator/xcconfig/aggregate_xcconfig.rb

@@ -44,11 +44,13 @@ module Pod
       # @return [Xcodeproj::Config]
       #
       def generate
+      	header_search_path_flags = target.sandbox.public_headers.search_paths.map {|path| '-isystem'+path}
         @xcconfig = Xcodeproj::Config.new({
           'OTHER_LDFLAGS' => XCConfigHelper.default_ld_flags(target),
           'HEADER_SEARCH_PATHS' => XCConfigHelper.quote(target.sandbox.public_headers.search_paths),
           'PODS_ROOT' => target.relative_pods_root,
           'GCC_PREPROCESSOR_DEFINITIONS' => '$(inherited) COCOAPODS=1',
+          'OTHER_CFLAGS' => '$(inherited) ' + XCConfigHelper.quote(header_search_path_flags)
         })
 
         target.pod_targets.each do |pod_target|

spec/unit/generator/xcconfig/aggregate_xcconfig_spec.rb

@@ -55,11 +55,16 @@ module Pod
           @xcconfig.to_hash['PODS_ROOT'].should == '${SRCROOT}/Pods'
         end
 
-        it 'adds the sandbox public headers search paths to the xcconfig, with quotes' do
+        it 'adds the sandbox public headers search paths to the xcconfig, with quotes, as header search paths' do
           expected = "\"#{config.sandbox.public_headers.search_paths.join('" "')}\""
           @xcconfig.to_hash['HEADER_SEARCH_PATHS'].should == expected
         end
 
+        it 'adds the sandbox public headers search paths to the xcconfig, with quotes, as system headers' do
+          expected = "$(inherited) \"-isystem#{config.sandbox.public_headers.search_paths.join('" -isystem"')}\""
+          @xcconfig.to_hash['OTHER_CFLAGS'].should == expected
+        end
+
         it 'adds the COCOAPODS macro definition' do
           @xcconfig.to_hash['GCC_PREPROCESSOR_DEFINITIONS'].should.include 'COCOAPODS=1'
         end