ARM: add arm_fpu option to specify which version of vfp to use

build/common.gypi

 # Copyright (c) 2010 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': {
     # .gyp files or targets should set chromium_code to 1 if they build
@@ skipping 197 matching lines @@
     # Set to select the Title Case versions of strings in GRD files.
     'use_titlecase_in_grd_files%': 0,
 
     # Used to disable Native Client at compile time, for platforms where it
     # isn't supported
     'disable_nacl%': 0,
 
     # Set Thumb compilation flags.
     'arm_thumb%': 0,
 
+    # Set ARM fpu compilation flags (only meaningful if armv7==1 and
+    # arm_neon==0).
+    'arm_fpu%': 'vfpv3',
+
     'conditions': [
       ['OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
         # 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/lib/libpython<(python_ver).so.1.0)',
         'conditions': [
           ['branding=="Chrome" or linux_chromium_breakpad==1', {
             'linux_breakpad%': 1,
@@ skipping 687 matching lines @@
                   ['armv7==1', {
                     'cflags': [
                       '-march=armv7-a',
                       '-mtune=cortex-a8',
                       '-mfloat-abi=softfp',
                     ],
                     'conditions': [
                       ['arm_neon==1', {
                         'cflags': [ '-mfpu=neon', ],
                       }, {
-                        'cflags': [ '-mfpu=vfpv3', ],
+                        'cflags': [ '-mfpu=<(arm_fpu)', ],
                       }]
                     ],
                   }],
                 ],
               }],
             ],
           }],
           ['linux_fpic==1', {
             'cflags': [
               '-fPIC',
@@ skipping 298 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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