ios: Use a 10.7 deployment target for host builds.

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 1910 matching lines @@
 
           # Normally, mac_sdk_min is used to find an SDK that Xcode knows
           # about that is at least the specified version. In official builds,
           # the SDK must match mac_sdk_min exactly. If the SDK is installed
           # someplace that Xcode doesn't know about, set mac_sdk_path to the
           # path to the SDK; when set to a non-empty string, SDK detection
           # based on mac_sdk_min will be bypassed entirely.
           'conditions': [
             ['OS=="ios"', {
               'mac_sdk_min%': '10.8',
+              # The iOS build can use Xcode's clang, and that will complain
+              # about -stdlib=libc++ if the deployment target is not at least
+              # 10.7.
+              'mac_deployment_target%': '10.7',
             }, {  # else OS!="ios"
               'mac_sdk_min%': '10.10',
+              'mac_deployment_target%': '10.6',
             }],
           ],
           'mac_sdk_path%': '',
 
-          'mac_deployment_target%': '10.6',
         },
 
         'mac_sdk_min': '<(mac_sdk_min)',
         'mac_sdk_path': '<(mac_sdk_path)',
         'mac_deployment_target': '<(mac_deployment_target)',
 
         # Compile in Breakpad support by default so that it can be
         # tested, even if it is not enabled by default at runtime.
         'mac_breakpad_compiled_in%': 1,
         'conditions': [
@@ skipping 3493 matching lines @@
           ['_toolset=="host"', {
             'xcode_settings': {
               'SDKROOT': 'macosx<(mac_sdk)',  # -isysroot
               'MACOSX_DEPLOYMENT_TARGET': '<(mac_deployment_target)',
               'VALID_ARCHS': [
                 'x86_64',
               ],
               'ARCHS': [
                 'x86_64',
               ],
+              'WARNING_CFLAGS': [
+                # TODO(thakis): Remove this once the deployment target on OS X
+                # is 10.7 too, http://crbug.com/547071
+                # In general, it is NOT OK to add -Wno-deprecated-declarations
+                # anywhere, you should instead fix your code instead.  But host
+                # compiles on iOS are really mac compiles, so this will be fixed
+                # when the mac deployment target is increased.  (Some of the
+                # fixes depend on OS X 10.7 so they can't be done before mac
+                # upgrades).
+                '-Wno-deprecated-declarations',
+              ],
             },
           }],
           ['_toolset=="target"', {
             'xcode_settings': {
               # This section should be for overriding host settings. But,
               # since we can't negate the iphone deployment target above, we
               # instead set it here for target only.
               'IPHONEOS_DEPLOYMENT_TARGET': '<(ios_deployment_target)',
               'ARCHS': ['$(ARCHS_STANDARD_INCLUDING_64_BIT)'],
             },
@@ skipping 836 matching lines @@
     # 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',
   },
 }