Add iOS support to common.gypi

build/common.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 54 matching lines @@
         'use_openssl%': '<(use_openssl)',
         'use_ibus%': '<(use_ibus)',
         'enable_viewport%': '<(enable_viewport)',
         'enable_hidpi%': '<(enable_hidpi)',
         'enable_touch_ui%': '<(enable_touch_ui)',
         'android_upstream_bringup%': '<(android_upstream_bringup)',
         'buildtype%': '<(buildtype)',
 
         # Compute the architecture that we're building on.
         'conditions': [
-          [ 'OS=="win" or OS=="mac"', {
+          ['OS=="win" or OS=="mac" or OS=="ios"', {
             'host_arch%': 'ia32',
           }, {
             # This handles the Unix platforms for which there is some support.
             # Anything else gets passed through, which probably won't work very
             # well; such hosts should pass an explicit target_arch to gyp.
             'host_arch%':
               '<!(uname -m | sed -e "s/i.86/ia32/;s/x86_64/x64/;s/amd64/x64/;s/arm.*/arm/;s/i86pc/ia32/")',
           }],
 
           # Chromeos implies ash.
@@ skipping 218 matching lines @@
       #
       # Note that a setting of 1 is probably suitable for most or all
       # Windows developers using VS 2008, since precompiled headers
       # provide a build speedup of 20-25%.  There are a couple of
       # small workarounds you may need to use when using VS 2008 (but
       # not 2010), see
       # http://code.google.com/p/chromium/wiki/WindowsPrecompiledHeaders
       # for details.
       'chromium_win_pch%': 0,
 
+      # iOS SDK and deployment target support.  The iOS 5.0 SDK is actually
+      # what is required, but the value is left blank so when it is set in
+      # the project files it will be the "current" iOS SDK.  Forcing 5.0
+      # even though it is "current" causes Xcode to spit out a warning for
+      # every single project file for not using the "current" SDK.
+      'ios_sdk%': '',
+      'ios_deployment_target%': '4.3',
+
       # Set this to true when building with Clang.
       # See http://code.google.com/p/chromium/wiki/Clang for details.
       'clang%': 0,
 
       # Enable plug-in installation by default.
       'enable_plugin_installation%': 1,
 
       # Enable protector service by default.
       'enable_protector_service%': 1,
 
@@ skipping 53 matching lines @@
         }],
 
         # NSS usage.
         ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris") and use_openssl==0', {
           'use_nss%': 1,
         }, {
           'use_nss%': 0,
         }],
 
         # Flags to use X11 on non-Mac POSIX platforms
-        ['OS=="win" or OS=="mac" or OS=="android"', {
+        ['OS=="win" or OS=="mac" or OS=="ios" or OS=="android"', {
           'use_glib%': 0,
           'use_x11%': 0,
         }, {
           'use_glib%': 1,
           'use_x11%': 1,
         }],
 
         # Set toolkit_uses_gtk for the Chromium browser on Linux.
         ['(OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris") and use_aura==0', {
           'toolkit_uses_gtk%': 1,
@@ skipping 11 matching lines @@
         # A flag to enable or disable our compile-time dependency
         # on gnome-keyring. If that dependency is disabled, no gnome-keyring
         # support will be available. This option is useful
         # for Linux distributions and for Aura.
         ['chromeos==1 or use_aura==1', {
           'use_gnome_keyring%': 0,
         }, {
           'use_gnome_keyring%': 1,
         }],
 
-        ['toolkit_views==0 or OS=="mac"', {
-          # GTK+ and Mac wants Title Case strings
+        ['toolkit_views==0 or OS=="mac" or OS=="ios"', {
+          # GTK+, Mac and iOS want Title Case strings
           'use_titlecase_in_grd_files%': 1,
         }],
 
         # Enable file manager extension on Chrome OS.
         ['chromeos==1', {
           'file_manager_extension%': 1,
         }, {
           'file_manager_extension%': 0,
         }],
 
@@ skipping 18 matching lines @@
         ['OS=="win" and MSVS_VERSION=="2010" and buildtype!="Official"', {
           'chromium_win_pch%': 1
         }],
 
         ['use_aura==1 or chromeos==1 or OS=="android"', {
           'enable_plugin_installation%': 0,
         }, {
           'enable_plugin_installation%': 1,
         }],
 
-        ['OS=="android"', {
+        ['OS=="android" or OS=="ios"', {
           'enable_protector_service%': 0,
         }, {
           'enable_protector_service%': 1,
         }],
 
         # linux_use_gold_binary: whether to use the binary checked into
         # third_party/gold.
         ['OS=="linux"', {
           'linux_use_gold_binary%': 1,
         }, {
@@ skipping 75 matching lines @@
     'safe_browsing%': '<(safe_browsing)',
     'input_speech%': '<(input_speech)',
     'notifications%': '<(notifications)',
     'clang_use_chrome_plugins%': '<(clang_use_chrome_plugins)',
     'asan%': '<(asan)',
     'order_profiling%': '<(order_profiling)',
     'order_text_section%': '<(order_text_section)',
     'enable_extensions%': '<(enable_extensions)',
     'enable_web_intents%': '<(enable_web_intents)',
     'enable_web_intents_tag%': '<(enable_web_intents_tag)',
+    'ios_sdk%': '<(ios_sdk)',
+    'ios_deployment_target%': '<(ios_deployment_target)',
     'enable_plugin_installation%': '<(enable_plugin_installation)',
     'enable_protector_service%': '<(enable_protector_service)',
     'enable_session_service%': '<(enable_session_service)',
     'enable_themes%': '<(enable_themes)',
     'enable_background%': '<(enable_background)',
     'enable_promo_resource_service%': '<(enable_promo_resource_service)',
     'linux_use_gold_binary%': '<(linux_use_gold_binary)',
     'linux_use_gold_flags%': '<(linux_use_gold_flags)',
     'use_canvas_skia%': '<(use_canvas_skia)',
     'test_isolation_mode%': '<(test_isolation_mode)',
@@ skipping 215 matching lines @@
 
     # If debug_devtools is set to 1, JavaScript files for DevTools are
     # stored as is and loaded from disk. Otherwise, a concatenated file
     # is stored in resources.pak. It is still possible to load JS files
     # from disk by passing --debug-devtools cmdline switch.
     'debug_devtools%': 0,
 
     # The Java Bridge is not compiled in by default.
     'java_bridge%': 0,
 
+    # Code signing for iOS binaries.  The bots need to be able to disable this.
+    'chromium_ios_signing%': 1,
+
     # This flag is only used when disable_nacl==0 and disables all those
     # subcomponents which would require the installation of a native_client
     # untrusted toolchain.
     'disable_nacl_untrusted%': 0,
 
     # Disable Dart by default.
     'enable_dart%': 0,
 
     # The desired version of Windows SDK can be set in ~/.gyp/include.gypi.
     'msbuild_toolset%': '',
 
     # Native Client is enabled by default.
     'disable_nacl%': 0,
 
     'sas_dll_exists': '<!(python <(DEPTH)/build/dir_exists.py <(sas_dll_path))',
     'wix_exists': '<!(python <(DEPTH)/build/dir_exists.py <(wix_path))',
 
     'conditions': [
-      ['os_posix==1 and OS!="mac"', {
+      ['os_posix==1 and OS!="mac" and OS!="ios"', {
         # This will set gcc_version to XY if you are running gcc X.Y.*.
         # This is used to tweak build flags for gcc 4.4.
         'gcc_version%': '<!(python <(DEPTH)/build/compiler_version.py)',
         # Figure out the python architecture to decide if we build pyauto.
         'python_arch%': '<!(<(DEPTH)/build/linux/python_arch.sh <(sysroot)/usr/<(system_libdir)/libpython<(python_ver).so.1.0)',
         'conditions': [
           ['branding=="Chrome"', {
             'linux_breakpad%': 1,
           }],
           # All Chrome builds have breakpad symbols, but only process the
           # symbols from official builds.
           ['(branding=="Chrome" and buildtype=="Official")', {
             'linux_dump_symbols%': 1,
           }],
         ],
-      }],
+      }],  # os_posix==1 and OS!="mac" and OS!="ios"
       ['OS=="android"', {
         # Location of Android NDK.
         'variables': {
           'variables': {
             'android_ndk_root%': '<!(/bin/echo -n $ANDROID_NDK_ROOT)',
             # Android uses x86 instead of ia32 for their target_arch
             # designation.
             # TODO(wistoch): Adjust the target_arch naming scheme to avoid
             # confusion.
             # http://crbug.com/125329
@@ skipping 351 matching lines @@
       # section, and will not have access to the default fallback value of
       # chromium_code at the top of this file, or to the chromium_code
       # variable placed at the root variables scope of .gyp files, because
       # those variables are not set at target scope.  As a workaround,
       # if chromium_code is not set at target scope, define it in target scope
       # to contain whatever value it has during early variable expansion.
       # That's enough to make it available during target conditional
       # processing.
       'chromium_code%': '<(chromium_code)',
 
-      # See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Optimize-Options.html
-      'mac_release_optimization%': '3', # Use -O3 unless overridden
-      'mac_debug_optimization%': '0',   # Use -O0 unless overridden
-
       # See http://msdn.microsoft.com/en-us/library/aa652360(VS.71).aspx
       'win_release_Optimization%': '2', # 2 = /Os
       'win_debug_Optimization%': '0',   # 0 = /Od
 
       # See http://msdn.microsoft.com/en-us/library/2kxx5t2c(v=vs.80).aspx
       # Tri-state: blank is default, 1 on, 0 off
       'win_release_OmitFramePointers%': '0',
       # Tri-state: blank is default, 1 on, 0 off
       'win_debug_OmitFramePointers%': '',
 
@@ skipping 34 matching lines @@
       'conditions': [
         ['OS=="win" and component=="shared_library"', {
           # See http://msdn.microsoft.com/en-us/library/aa652367.aspx
           'win_release_RuntimeLibrary%': '2', # 2 = /MD (nondebug DLL)
           'win_debug_RuntimeLibrary%': '3',   # 3 = /MDd (debug DLL)
         }, {
           # See http://msdn.microsoft.com/en-us/library/aa652367.aspx
           'win_release_RuntimeLibrary%': '0', # 0 = /MT (nondebug static)
           'win_debug_RuntimeLibrary%': '1',   # 1 = /MTd (debug static)
         }],
+        ['OS=="ios"', {
+          # See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Optimize-Options.html
+          'mac_release_optimization%': 's', # Use -Os unless overridden
+          'mac_debug_optimization%': '0',   # Use -O0 unless overridden
+        }, {
+          # See http://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Optimize-Options.html
+          'mac_release_optimization%': '3', # Use -O3 unless overridden
+          'mac_debug_optimization%': '0',   # Use -O0 unless overridden
+        }],
       ],
     },
     'conditions': [
       ['OS=="win" and "<(msbuild_toolset)"!=""', {
         'msbuild_toolset': '<(msbuild_toolset)',
       }],
       ['branding=="Chrome"', {
         'defines': ['GOOGLE_CHROME_BUILD'],
       }, {  # else: branding!="Chrome"
         'defines': ['CHROMIUM_BUILD'],
@@ skipping 263 matching lines @@
             'xcode_settings': {
               'WARNING_CFLAGS': [
                 '-Wexit-time-destructors',
               ],
             },
           }],
         ],
       }],
       ['chromium_code==0', {
         'conditions': [
-          [ 'os_posix==1 and OS!="mac"', {
+          [ 'os_posix==1 and OS!="mac" and OS!="ios"', {
             # We don't want to get warnings from third-party code,
             # so remove any existing warning-enabling flags like -Wall.
             'cflags!': [
               '-Wall',
               '-Wextra',
               '-Werror',
             ],
             'cflags_cc': [
               # Don't warn about hash_map in third-party code.
               '-Wno-deprecated',
@@ skipping 33 matching lines @@
                 'Detect64BitPortabilityProblems': 'false',
               },
             },
           }],
           # TODO(darin): Unfortunately, some third_party code depends on base/
           [ 'OS=="win" and component=="shared_library"', {
             'msvs_disabled_warnings': [
               4251,  # class 'std::xx' needs to have dll-interface.
             ],
           }],
-          [ 'OS=="mac"', {
+          [ 'OS=="mac" or OS=="ios"', {
             'xcode_settings': {
               'WARNING_CFLAGS!': ['-Wall', '-Wextra'],
             },
             'conditions': [
               ['buildtype=="Official"', {
                 'xcode_settings': {
                   'GCC_TREAT_WARNINGS_AS_ERRORS': 'NO',    # -Werror
                 },
               }],
             ],
           }],
+          [ 'OS=="ios"', {
+            'xcode_settings': {
+              'RUN_CLANG_STATIC_ANALYZER': 'NO',
+            },
+          }],
         ],
       }, {
         'includes': [
            # Rules for excluding e.g. foo_win.cc from the build on non-Windows.
           'filename_rules.gypi',
         ],
         # In Chromium code, we define __STDC_FORMAT_MACROS in order to get the
         # C99 macros on Mac and Linux.
         'defines': [
           '__STDC_FORMAT_MACROS',
@@ skipping 134 matching lines @@
         'conditions': [
           ['OS=="linux"', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags': [
                   '<@(debug_extra_cflags)',
                 ],
               }],
             ],
           }],
-          ['release_valgrind_build==0', {
+          # Disabled on iOS because it was causing a crash on startup.
+          # TODO(michelea): investigate, create a reduced test and possibly
+          # submit a radar.
+          ['release_valgrind_build==0 and OS!="ios"', {
             'xcode_settings': {
               'OTHER_CFLAGS': [
                 '-fstack-protector-all',  # Implies -fstack-protector
               ],
             },
           }],
         ],
       },
       'Release_Base': {
         'abstract': 1,
@@ skipping 100 matching lines @@
             'inherit_from': ['Common_Base', 'x64_Base', 'Debug_Base'],
           },
           'Release_x64': {
             'inherit_from': ['Common_Base', 'x64_Base', 'Release_Base'],
           },
         }],
       ],
     },
   },
   'conditions': [
-    ['os_posix==1 and OS!="mac"', {
+    ['os_posix==1 and OS!="mac" and OS!="ios"', {
       'target_defaults': {
         # Enable -Werror by default, but put it in a variable so it can
         # be disabled in ~/.gyp/include.gypi on the valgrind builders.
         'variables': {
           'werror%': '-Werror',
-          'libraries_for_target%': '',
+          'libraries_for_target%': '',
         },
         'defines': [
           '_FILE_OFFSET_BITS=64',
         ],
         'cflags': [
           '<(werror)',  # See note above about the werror variable.
           '-pthread',
           '-fno-exceptions',
           '-fno-strict-aliasing',  # See http://crbug.com/32204
           '-Wall',
@@ skipping 16 matching lines @@
           '-fvisibility-inlines-hidden',
           # GCC turns on -Wsign-compare for C++ under -Wall, but clang doesn't,
           # so we specify it explicitly.
           # TODO(fischman): remove this if http://llvm.org/PR10448 obsoletes it.
           # http://code.google.com/p/chromium/issues/detail?id=90453
           '-Wsign-compare',
         ],
         'ldflags': [
           '-pthread', '-Wl,-z,noexecstack',
         ],
-        'libraries' : [
-          '<(libraries_for_target)',
-        ],
+        'libraries' : [
+          '<(libraries_for_target)',
+        ],
         'configurations': {
           'Debug_Base': {
             'variables': {
               'debug_optimize%': '0',
             },
             'defines': [
               '_DEBUG',
             ],
             'cflags': [
               '-O>(debug_optimize)',
@@ skipping 631 matching lines @@
               ['exclude', '(^|/)android/']
             ],
           }],
         ],
       },
     }],
     ['OS=="solaris"', {
       'cflags!': ['-fvisibility=hidden'],
       'cflags_cc!': ['-fvisibility-inlines-hidden'],
     }],
-    ['OS=="mac"', {
+    ['OS=="mac" or OS=="ios"', {
       'target_defaults': {
-        'variables': {
-          # These should end with %, but there seems to be a bug with % in
-          # variables that are intended to be set to different values in
-          # different targets, like these.
-          'mac_pie': 1,        # Most executables can be position-independent.
-          'mac_real_dsym': 0,  # Fake .dSYMs are fine in most cases.
-          # Strip debugging symbols from the target.
-          'mac_strip': '<(mac_strip_release)',
-        },
         'mac_bundle': 0,
         'xcode_settings': {
           'ALWAYS_SEARCH_USER_PATHS': 'NO',
           'GCC_C_LANGUAGE_STANDARD': 'c99',         # -std=c99
           'GCC_CW_ASM_SYNTAX': 'NO',                # No -fasm-blocks
-          'GCC_DYNAMIC_NO_PIC': 'NO',               # No -mdynamic-no-pic
-                                                    # (Equivalent to -fPIC)
           'GCC_ENABLE_CPP_EXCEPTIONS': 'NO',        # -fno-exceptions
           'GCC_ENABLE_CPP_RTTI': 'NO',              # -fno-rtti
           'GCC_ENABLE_PASCAL_STRINGS': 'NO',        # No -mpascal-strings
           # GCC_INLINES_ARE_PRIVATE_EXTERN maps to -fvisibility-inlines-hidden
           'GCC_INLINES_ARE_PRIVATE_EXTERN': 'YES',
           'GCC_OBJC_CALL_CXX_CDTORS': 'YES',        # -fobjc-call-cxx-cdtors
           'GCC_SYMBOLS_PRIVATE_EXTERN': 'YES',      # -fvisibility=hidden
           'GCC_THREADSAFE_STATICS': 'NO',           # -fno-threadsafe-statics
           'GCC_TREAT_WARNINGS_AS_ERRORS': 'YES',    # -Werror
           'GCC_VERSION': '4.2',
           'GCC_WARN_ABOUT_MISSING_NEWLINE': 'YES',  # -Wnewline-eof
-          # MACOSX_DEPLOYMENT_TARGET maps to -mmacosx-version-min
-          'MACOSX_DEPLOYMENT_TARGET': '<(mac_deployment_target)',
-          # Keep pch files below xcodebuild/.
-          'SHARED_PRECOMPS_DIR': '$(CONFIGURATION_BUILD_DIR)/SharedPrecompiledHeaders',
           'USE_HEADERMAP': 'NO',
-          'OTHER_CFLAGS': [
-            '-fno-strict-aliasing',  # See http://crbug.com/32204
-          ],
           'WARNING_CFLAGS': [
             '-Wall',
             '-Wendif-labels',
             '-Wextra',
             # Don't warn about unused function parameters.
             '-Wno-unused-parameter',
             # Don't warn about the "struct foo f = {0};" initialization
             # pattern.
             '-Wno-missing-field-initializers',
           ],
           'conditions': [
             ['chromium_mac_pch', {'GCC_PRECOMPILE_PREFIX_HEADER': 'YES'},
                                  {'GCC_PRECOMPILE_PREFIX_HEADER': 'NO'}
             ],
+          ],
+        },
+        'target_conditions': [
+          ['_type!="static_library"', {
+            'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-search_paths_first']},
+          }],
+          ['_mac_bundle', {
+            'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-ObjC']},
+          }],
+        ],  # target_conditions
+      },  # target_defaults
+    }],  # OS=="mac" or OS=="ios"
+    ['OS=="mac"', {
+      'target_defaults': {
+        'variables': {
+          # These should end with %, but there seems to be a bug with % in
+          # variables that are intended to be set to different values in
+          # different targets, like these.
+          'mac_pie': 1,        # Most executables can be position-independent.
+          'mac_real_dsym': 0,  # Fake .dSYMs are fine in most cases.
+          # Strip debugging symbols from the target.
+          'mac_strip': '<(mac_strip_release)',
+        },
+        'xcode_settings': {
+          'GCC_DYNAMIC_NO_PIC': 'NO',               # No -mdynamic-no-pic
+                                                    # (Equivalent to -fPIC)
+          # MACOSX_DEPLOYMENT_TARGET maps to -mmacosx-version-min
+          'MACOSX_DEPLOYMENT_TARGET': '<(mac_deployment_target)',
+          # Keep pch files below xcodebuild/.
+          'SHARED_PRECOMPS_DIR': '$(CONFIGURATION_BUILD_DIR)/SharedPrecompiledHeaders',
+          'OTHER_CFLAGS': [
+            '-fno-strict-aliasing',  # See http://crbug.com/32204
+          ],
+          'conditions': [
             ['clang==1', {
               'CC': '$(SOURCE_ROOT)/<(clang_dir)/clang',
               'LDPLUSPLUS': '$(SOURCE_ROOT)/<(clang_dir)/clang++',
 
               # Don't use -Wc++0x-extensions, which Xcode 4 enables by default
               # when buliding with clang. This warning is triggered when the
               # override keyword is used via the OVERRIDE macro from
               # base/compiler_specific.h.
               'CLANG_WARN_CXX0X_EXTENSIONS': 'NO',
 
@@ skipping 182 matching lines @@
                     'action': ['<(strip_from_xcode_path)'],
                   },
                 ],  # postbuilds
               }],  # mac_real_dsym
             ],  # target_conditions
           }],  # (_type=="executable" or _type=="shared_library" or
                #  _type=="loadable_module") and mac_strip!=0
         ],  # target_conditions
       },  # target_defaults
     }],  # OS=="mac"
+    ['OS=="ios"', {
+      'target_defaults': {
+        'xcode_settings' : {
+          'GCC_VERSION': 'com.apple.compilers.llvm.clang.1_0',
+
+          # This next block is mostly common with the 'mac' section above,
+          # but keying off (or setting) 'clang' isn't valid for iOS as it
+          # also seems to mean using the custom build of clang.
+
+          # Don't use -Wc++0x-extensions, which Xcode 4 enables by default
+          # when buliding with clang. This warning is triggered when the
+          # override keyword is used via the OVERRIDE macro from
+          # base/compiler_specific.h.
+          'CLANG_WARN_CXX0X_EXTENSIONS': 'NO',
+          'WARNING_CFLAGS': [
+            '-Wheader-hygiene',
+            # Don't die on dtoa code that uses a char as an array index.
+            # This is required solely for base/third_party/dmg_fp/dtoa.cc.
+            '-Wno-char-subscripts',
+            # Clang spots more unused functions.
+            '-Wno-unused-function',
+            # See comments on this flag higher up in this file.
+            '-Wno-unnamed-type-template-args',
+            # This (rightyfully) complains about 'override', which we use
+            # heavily.
+            '-Wno-c++11-extensions',
+          ],
+        },
+        'target_conditions': [
+          ['_type=="executable"', {
+            'configurations': {
+              'Release_Base': {
+                'xcode_settings': {
+                  'DEPLOYMENT_POSTPROCESSING': 'YES',
+                  'STRIP_INSTALLED_PRODUCT': 'YES',
+                },
+              },
+            },
+            'xcode_settings': {
+              'conditions': [
+                ['chromium_ios_signing', {
+                  # iOS SDK wants everything for device signed.
+                  'CODE_SIGN_IDENTITY[sdk=iphoneos*]': 'iPhone Developer',
+                }, {
+                  'CODE_SIGNING_REQUIRED': 'NO',
+                  'CODE_SIGN_IDENTITY[sdk=iphoneos*]': '',
+                }],
+              ],
+            },
+          }],
+        ],  # target_conditions
+      },  # target_defaults
+    }],  # OS=="ios"
     ['OS=="win"', {
       'target_defaults': {
         'defines': [
           '_WIN32_WINNT=0x0601',
           'WINVER=0x0601',
           'WIN32',
           '_WINDOWS',
           'NOMINMAX',
           'PSAPI_VERSION=1',
           '_CRT_RAND_S',
@@ skipping 266 matching lines @@
         ['LINK.host', '<!(which g++)'],
       ],
     }],
   ],
   'xcode_settings': {
     # DON'T ADD ANYTHING NEW TO THIS BLOCK UNLESS YOU REALLY REALLY NEED IT!
     # This block adds *project-wide* configuration settings to each project
     # file.  It's almost always wrong to put things here.  Specify your
     # custom xcode_settings in target_defaults to add them to targets instead.
 
-    # In an Xcode Project Info window, the "Base SDK for All Configurations"
-    # setting sets the SDK on a project-wide basis.  In order to get the
-    # configured SDK to show properly in the Xcode UI, SDKROOT must be set
-    # here at the project level.
-    'SDKROOT': 'macosx<(mac_sdk)',  # -isysroot
+    'conditions': [
+      ['OS=="mac"', {
+        # In an Xcode Project Info window, the "Base SDK for All Configurations"
+        # setting sets the SDK on a project-wide basis.  In order to get the
+        # configured SDK to show properly in the Xcode UI, SDKROOT must be set
+        # here at the project level.
+        'SDKROOT': 'macosx<(mac_sdk)',  # -isysroot
+      }],
+      ['OS=="ios"', {
+        # Just build armv7 since iOS 4.3+ only supports armv7.
+        'ARCHS': '$(ARCHS_UNIVERSAL_IPHONE_OS)',
+        'IPHONEOS_DEPLOYMENT_TARGET': '<(ios_deployment_target)',
+        'SDKROOT': 'iphoneos<(ios_sdk)',  # -isysroot
+        # Target both iPhone and iPad.
+        'TARGETED_DEVICE_FAMILY': '1,2',
+      }],
+    ],
 
     # The Xcode generator will look for an xcode_settings section at the root
     # of each dict and use it to apply settings on a file-wide basis.  Most
     # settings should not be here, they should be in target-specific
     # xcode_settings sections, or better yet, should use non-Xcode-specific
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }