Introduce arm_version to allow building for armv5, v6 or v7.

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 105 matching lines @@
         'android_webview_build%': 0,
 
         # Sets whether chrome is built for google tv device.
         'google_tv%': 0,
 
         # This variable tells WebCore.gyp and JavaScriptCore.gyp whether they
         # are built under a chromium full build (1) or a webkit.org chromium
         # build (0).
         'inside_chromium_build%': 1,
 
+        # Set ARM architecture version.
+        'arm_version%': 7,
+
         'conditions': [
           # Set default value of toolkit_views based on OS.
           ['OS=="win" or chromeos==1 or use_aura==1', {
             'toolkit_views%': 1,
           }, {
             'toolkit_views%': 0,
           }],
 
           # 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', {
@@ skipping 47 matching lines @@
       'enable_viewport%': '<(enable_viewport)',
       'enable_hidpi%': '<(enable_hidpi)',
       'enable_touch_ui%': '<(enable_touch_ui)',
       'android_webview_build%': '<(android_webview_build)',
       'google_tv%': '<(google_tv)',
       'inside_chromium_build%': '<(inside_chromium_build)',
       'enable_app_list%': '<(enable_app_list)',
       'enable_message_center%': '<(enable_message_center)',
       'use_default_render_theme%': '<(use_default_render_theme)',
       'buildtype%': '<(buildtype)',
+      'arm_version%': '<(arm_version)',
 
       # Override branding to select the desired branding flavor.
       'branding%': 'Chromium',
 
       # Set to 1 to enable fast builds. Set to 2 for even faster builds
       # (it disables debug info for fastest compilation - only for use
       # on compile-only bots).
       'fastbuild%': 0,
 
       # Set to 1 to enable dcheck in release without having to use the flag.
       'dcheck_always_on%': 0,
 
       # Disable file manager component extension by default.
       'file_manager_extension%': 0,
 
       # Disable image loader component extension by default.
       'image_loader_extension%': 0,
 
       # Python version.
       'python_ver%': '2.6',
 
-      # Set ARM-v7 compilation flags
-      'armv7%': 0,
 
-      # Set Neon compilation flags (only meaningful if armv7==1).
+      # Set NEON compilation flags.
       'arm_neon%': 1,
 
+      # Detect NEON support at run-time.
+      'arm_neon_optional%': 0,
+
       # The system root for cross-compiles. Default: none.
       'sysroot%': '',
 
       # The system libdir used for this ABI.
       'system_libdir%': 'lib',
 
       # On Linux, we build with sse2 for Chromium builds.
       'disable_sse2%': 0,
 
       # Use libjpeg-turbo as the JPEG codec used by Chromium.
@@ skipping 187 matching lines @@
           'os_posix%': 1,
         }],
 
         # A flag for BSD platforms
         ['OS=="freebsd" or OS=="openbsd"', {
           'os_bsd%': 1,
         }, {
           'os_bsd%': 0,
         }],
 
+        # Set armv7 for backward compatibility.
+        ['arm_version==7', {
+          'armv7': 1,
+        }, {
+          'armv7': 0,
+        }],
+
         # 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=="ios" or OS=="android" or use_messagepump_linux==1', {
           'use_x11%': 0,
@@ skipping 45 matching lines @@
 
         ['OS=="android"', {
           'enable_automation%': 0,
           'enable_extensions%': 0,
           'enable_google_now%': 0,
           'enable_language_detection%': 1,
           'enable_printing%': 0,
           'enable_themes%': 0,
           'proprietary_codecs%': 1,
           'remoting%': 0,
+          'arm_neon%': 0,
+          'arm_neon_optional%': 1,
         }],
 
         # Enable autofill dialog for Android and Views-enabled platforms for now.
         ['toolkit_views==1 or (OS=="android" and android_webview_build==0)', {
           'enable_autofill_dialog%': 1
         }],
 
         ['OS=="android" and android_webview_build==0', {
           'enable_webrtc%': 1,
         }],
@@ skipping 101 matching lines @@
 
         # Enable Settings App only on Windows.
         ['enable_app_list==1 and OS=="win"', {
           'enable_settings_app%': 1,
         }, {
           'enable_settings_app%': 0,
         }],
 
         ['OS=="linux" and target_arch=="arm" and chromeos==0', {
           # Set some defaults for arm/linux chrome builds
-          'armv7%': 1,
           'linux_breakpad%': 0,
           'linux_use_tcmalloc%': 0,
           # sysroot needs to be an absolute path otherwise it generates
           # incorrect results when passed to pkg-config
           'sysroot%': '<!(cd <(DEPTH) && pwd -P)/arm-sysroot',
         }], # OS=="linux" and target_arch=="arm" and chromeos==0
 
         ['target_arch=="mipsel"', {
           'sysroot%': '<!(cd <(DEPTH) && pwd -P)/mipsel-sysroot/sysroot',
           'CXX%': '<!(cd <(DEPTH) && pwd -P)/mipsel-sysroot/bin/mipsel-linux-gnu-gcc',
@@ skipping 90 matching lines @@
     'enable_viewport%': '<(enable_viewport)',
     'enable_hidpi%': '<(enable_hidpi)',
     'enable_touch_ui%': '<(enable_touch_ui)',
     'use_xi2_mt%':'<(use_xi2_mt)',
     'file_manager_extension%': '<(file_manager_extension)',
     'image_loader_extension%': '<(image_loader_extension)',
     'inside_chromium_build%': '<(inside_chromium_build)',
     'fastbuild%': '<(fastbuild)',
     'dcheck_always_on%': '<(dcheck_always_on)',
     'python_ver%': '<(python_ver)',
+    'arm_version%': '<(arm_version)',
     'armv7%': '<(armv7)',
     'arm_neon%': '<(arm_neon)',
+    'arm_neon_optional%': '<(arm_neon_optional)',
     'sysroot%': '<(sysroot)',
     'system_libdir%': '<(system_libdir)',
     'component%': '<(component)',
     'use_titlecase_in_grd_files%': '<(use_titlecase_in_grd_files)',
     'use_third_party_translations%': '<(use_third_party_translations)',
     'remoting%': '<(remoting)',
     'enable_one_click_signin%': '<(enable_one_click_signin)',
     'enable_webrtc%': '<(enable_webrtc)',
     'chromium_win_pch%': '<(chromium_win_pch)',
     'configuration_policy%': '<(configuration_policy)',
@@ skipping 195 matching lines @@
 
     # Disable shadow stack keeping used by heapcheck to unwind the stacks
     # better.
     'linux_keep_shadow_stacks%': 0,
 
     # Set to 1 to link against libgnome-keyring instead of using dlopen().
     'linux_link_gnome_keyring%': 0,
     # Set to 1 to link against gsettings APIs instead of using dlopen().
     'linux_link_gsettings%': 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',
-
-    # Set ARM float abi compilation flag.
-    'arm_float_abi%': 'softfp',
-
     # Enable use of OpenMAX DL FFT routines.
     'use_openmax_dl_fft%': '<(use_openmax_dl_fft)',
 
     # Enable new NPDevice API.
     'enable_new_npdevice_api%': 0,
 
     # Enable EGLImage support in OpenMAX
     'enable_eglimage%': 1,
 
     # Enable a variable used elsewhere throughout the GYP files to determine
@@ skipping 217 matching lines @@
           # code compilation.
           'conditions': [
             ['target_arch == "ia32"', {
               'android_app_abi%': 'x86',
               'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-x86/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-x86',
               'android_toolchain%': '<(android_ndk_root)/toolchains/x86-4.6/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
             ['target_arch=="arm"', {
               'conditions': [
-                ['armv7==0', {
+                ['arm_version<7', {
                   'android_app_abi%': 'armeabi',
                 }, {
                   'android_app_abi%': 'armeabi-v7a',
                 }],
               ],
               'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-arm/gdbserver/gdbserver',
               'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-14/arch-arm',
               'android_toolchain%': '<(android_ndk_root)/toolchains/arm-linux-androideabi-4.6/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
           ],
@@ skipping 398 matching lines @@
         'win_debug_InlineFunctionExpansion': 0,
         'win_debug_OmitFramePointers': 0,
         # Keep the code under #ifndef NVALGRIND.
         'release_valgrind_build': 1,
       }],
 
       # Enable RLZ on Win, Mac and ChromeOS.
       ['branding=="Chrome" and (OS=="win" or OS=="mac" or chromeos==1)', {
         'enable_rlz%': 1,
       }],
+
+      # Set default compiler flags depending on ARM version.
+      ['arm_version==5 and android_webview_build==0', {
+        # Flags suitable for Android emulator
+        'arm_arch%': 'armv5te',
+        'arm_tune%': 'xscale',
+        'arm_fpu%': '',
+        'arm_float_abi%': 'soft',
+        'arm_thumb%': 0,
+      }],
+      ['arm_version==6 and android_webview_build==0', {
+        'arm_arch%': 'armv6',
+        'arm_tune%': '',
+        'arm_fpu%': '',
+        'arm_float_abi%': 'soft',
+        'arm_thumb%': 0,
+      }],
+      ['arm_version==7 and android_webview_build==0', {
+        'arm_arch%': 'armv7-a',
+        'arm_tune%': 'cortex-a8',
+        'conditions': [
+          ['arm_neon==1', {
+            'arm_fpu%': 'neon',
+          }, {
+            'arm_fpu%': 'vfpv3-d16',
+          }],
+        ],
+        'arm_float_abi%': 'softfp',
+        'arm_thumb%': 1,
+      }],
+
+      ['android_webview_build==1', {
+        # The WebView build gets its cpu-specific flags from the Android build system.
+        'arm_arch%': '',
+        'arm_tune%': '',
+        'arm_fpu%': '',
+        'arm_float_abi%': '',
+        'arm_thumb%': 0,
+      }],
     ],
 
     # List of default apps to install in new profiles.  The first list contains
     # the source files as found in svn.  The second list, used only for linux,
     # contains the destination location for each of the files.  When a crx
     # is added or removed from the list, the chrome/browser/resources/
     # default_apps/external_extensions.json file must also be updated.
     'default_apps_list': [
       'browser/resources/default_apps/external_extensions.json',
       'browser/resources/default_apps/gmail.crx',
@@ skipping 1195 matching lines @@
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags_cc': [
                   # The codesourcery arm-2009q3 toolchain warns at that the ABI
                   # has changed whenever it encounters a varargs function. This
                   # silences those warnings, as they are not helpful and
                   # clutter legitimate warnings.
                   '-Wno-abi',
                 ],
                 'conditions': [
-                  ['arm_thumb==1 and android_webview_build==0', {
+                  ['arm_arch!=""', {
+                    'cflags': [
+                      '-march=<(arm_arch)',
+                    ],
+                  }],
+                  ['arm_tune!=""', {
+                    'cflags': [
+                      '-mtune=<(arm_tune)',
+                    ],
+                  }],
+                  ['arm_fpu!=""', {
+                    'cflags': [
+                      '-mfpu=<(arm_fpu)',
+                    ],
+                  }],
+                  ['arm_float_abi!=""', {
+                    'cflags': [
+                      '-mfloat-abi=<(arm_float_abi)',
+                    ],
+                  }],
+                  ['arm_thumb==1', {
                     'cflags': [
                     '-mthumb',
                     ]
                   }],
-                  ['armv7==1 and android_webview_build==0', {
-                    'cflags': [
-                      '-march=armv7-a',
-                      '-mtune=cortex-a8',
-                      '-mfloat-abi=<(arm_float_abi)',
-                    ],
-                    'conditions': [
-                      ['arm_neon==1', {
-                        'cflags': [ '-mfpu=neon', ],
-                      }, {
-                        'cflags': [ '-mfpu=<(arm_fpu)', ],
-                      }],
-                    ],
-                  }],
                   ['OS=="android"', {
                     # Most of the following flags are derived from what Android
                     # uses by default when building for arm, reference for which
                     # can be found in the following file in the Android NDK:
                     # toolchains/arm-linux-androideabi-4.4.3/setup.mk
                     'cflags': [
                       # The tree-sra optimization (scalar replacement for
                       # aggregates enabling subsequent optimizations) leads to
                       # invalid code generation when using the Android NDK's
                       # compiler (r5-r7). This can be verified using
                       # webkit_unit_tests' WTF.Checked_int8_t test.
                       '-fno-tree-sra',
                       '-fuse-ld=gold',
                       '-Wno-psabi',
                     ],
                     # Android now supports .relro sections properly.
                     # NOTE: While these flags enable the generation of .relro
                     # sections, the generated libraries can still be loaded on
                     # older Android platform versions.
                     'ldflags': [
                         '-Wl,-z,relro',
                         '-Wl,-z,now',
                         '-fuse-ld=gold',
                     ],
                     'conditions': [
-                      ['arm_thumb==1 and android_webview_build==0', {
+                      ['arm_thumb==1', {
                         'cflags': [ '-mthumb-interwork' ],
                       }],
-                      ['armv7==0 and android_webview_build==0', {
-                        # Flags suitable for Android emulator
-                        'cflags': [
-                          '-march=armv5te',
-                          '-mtune=xscale',
-                          '-msoft-float',
-                        ],
-                        'defines': [
-                          '__ARM_ARCH_5__',
-                          '__ARM_ARCH_5T__',
-                          '__ARM_ARCH_5E__',
-                          '__ARM_ARCH_5TE__',
-                        ],
-                      }],
                       ['profiling==1', {
                         'cflags': [
                           '-marm', # Probably reduntant, but recommend by "perf" docs.
                           '-mapcs-frame', # Seems required by -fno-omit-frame-pointer.
                         ],
                       }],
                       ['clang==1', {
                         'cflags!': [
                           # Clang does not support the following options.
                           '-mthumb-interwork',
@@ skipping 1392 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',
   },
 }