Turn off SSE2 when building for ARM or MIPS.

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 1154 matching lines @@
         'use_cups%': 0,
       }],
 
       # Native Client glibc toolchain is enabled by default except on arm.
       ['target_arch=="arm"', {
         'disable_glibc%': 1,
       }, {
         'disable_glibc%': 0,
       }],
 
+      # Disable SSE2 when building for ARM or MIPS.
+      ['target_arch=="arm" or target_arch=="mipsel"', {
+        'disable_sse2%': 1,
+      }, {
+        'disable_sse2%': 0,

[tony, 2012/09/21 19:29:19]

Nit: I think you can delete the disable_sse2% variable on line 202 since this
will replace it.

[petarj, 2012/09/21 21:19:42]

If I do that, gyp complains with:
"gyp: Undefined variable disable_sse2 in build/all.gyp while trying to load
build/all.gyp".

[tony, 2012/09/21 21:27:55]

Ah, you're right.  I would delete the lines around 202 and move this condition
into the conditions block around like 388.  See the use_skia% variable as an
example.

[petarj, 2012/09/21 22:02:21]

I was actually experimenting with this one before, but that did not work since
"target_arch" was not defined there.
I have just double checked, and here is what I get:

NameError: name 'target_arch' is not defined while evaluating condition
'target_arch=="arm" or target_arch=="mipsel"' in build/all.gyp while trying to
load build/all.gyp

[tony, 2012/09/21 22:40:45]

I see, target_arch is defined at the same level as disable_sse2.  I guess this
is as good as it will get.

Sorry for the runaround. Thanks for trying all my requests.

LGTM

+      }],
+
       # Set the relative path from this file to the GYP file of the JPEG
       # library used by Chromium.
       ['use_system_libjpeg==1 or use_libjpeg_turbo==0', {
         # Configuration for using the system libjeg is here.
         'libjpeg_gyp_path': '../third_party/libjpeg/libjpeg.gyp',
       }, {
         'libjpeg_gyp_path': '../third_party/libjpeg_turbo/libjpeg.gyp',
       }],
 
       # Options controlling the use of GConf (the classic GNOME configuration
@@ skipping 2293 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',
   },
 }