Turn off SSE2 when building for ARM or MIPS.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index e3dee3515dd32c263ce2075f4dd5bbf74385949c..098931b80563758a894e38d4a081fab0ce47373d 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1172,6 +1172,13 @@
         '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', {