[inhibit_all_warningsDon't affect the final project.

CHANGELOG.md

+## Master
+[CocoaPods](https://github.com/CocoaPods/CocoaPods/compare/0.12.0...master)
+
+###### Bug fixes
+
+- The final project isn’t affected anymore by the `inhibit_all_warnings!` option.
+
 ## 0.12.0
 
 [CocoaPods](https://github.com/CocoaPods/CocoaPods/compare/0.11.1...0.12.0)
@@ -10,7 +17,7 @@
 - Don’t impose a certain structure of the user’s project by raising if no ‘Frameworks’ group exists. [#431](https://github.com/CocoaPods/CocoaPods/pull/431)
 - Support for GitHub Gists in the linter.
 - Allow specifying ARC settings in subspecs.
-- Add Podfile#inhibit_all_warnings! which will inhibit all warnings from the Pods library. [#209](https://github.com/CocoaPods/CocoaPods/issues/209)
+- Add Podfile `inhibit_all_warnings!` which will inhibit all warnings from the Pods library. [#209](https://github.com/CocoaPods/CocoaPods/issues/209)
 - Make the Pods Xcode project prettier by namespacing subspecs in nested groups. [#466](https://github.com/CocoaPods/CocoaPods/pull/466)
 
 

lib/cocoapods/installer/target_installer.rb

@@ -16,8 +16,7 @@ module Pod
           'PODS_ROOT'                     => @target_definition.relative_pods_root,
           'PODS_HEADERS_SEARCH_PATHS'     => '${PODS_PUBLIC_HEADERS_SEARCH_PATHS}',
           'ALWAYS_SEARCH_USER_PATHS'      => 'YES', # needed to make EmbedReader build
-          'OTHER_LDFLAGS'                 => default_ld_flags,
-          'GCC_WARN_INHIBIT_ALL_WARNINGS' => @target_definition.inhibit_all_warnings? ? 'YES' : 'NO',
+          'OTHER_LDFLAGS'                 => default_ld_flags
         })
       end
 
@@ -93,6 +92,7 @@ module Pod
           config.build_settings['GCC_PREFIX_HEADER'] = @target_definition.prefix_header_name
           config.build_settings['PODS_ROOT'] = '${SRCROOT}'
           config.build_settings['PODS_HEADERS_SEARCH_PATHS'] = '${PODS_BUILD_HEADERS_SEARCH_PATHS}'
+          config.build_settings['GCC_WARN_INHIBIT_ALL_WARNINGS'] = @target_definition.inhibit_all_warnings? ? 'YES' : 'NO'
         end
       end
 

spec/unit/installer/target_installer_spec.rb

@@ -67,12 +67,18 @@ describe Pod::Installer::TargetInstaller do
   end
 
   it "does not enable the GCC_WARN_INHIBIT_ALL_WARNINGS flag by default" do
-    @installer.xcconfig.to_hash['GCC_WARN_INHIBIT_ALL_WARNINGS'].should == 'NO'
+    do_install!
+    @installer.target.build_configurations.each do |config|
+      config.build_settings['GCC_WARN_INHIBIT_ALL_WARNINGS'].should == 'NO'
+    end
   end
 
   it "enables the GCC_WARN_INHIBIT_ALL_WARNINGS flag" do
     @podfile.inhibit_all_warnings!
-    @installer.xcconfig.to_hash['GCC_WARN_INHIBIT_ALL_WARNINGS'].should == 'YES'
+    do_install!
+    @installer.target.build_configurations.each do |config|
+      config.build_settings['GCC_WARN_INHIBIT_ALL_WARNINGS'].should == 'YES'
+    end
   end
 
   it "creates a prefix header, including the contents of the specification's prefix header file" do