MIPS: Silence warnings and unbreak optdebug build for target.

build/toolchain.gypi

 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 351 matching lines @@
             'defines': [
               '__mips_soft_float=1'
             ]
           }],
         ],
         'target_conditions': [
           ['_toolset=="target"', {
             'conditions': [
               ['v8_target_arch==target_arch and android_webview_build==0', {
                 # Target built with a Mips CXX compiler.
-                'cflags': ['-EB'],
+                'cflags': [
+                  '-EB',
+                  # Inhibit warning due to known issue present in the newer
+                  # versions of MIPS toolchain.
+                  '-Wno-error=array-bounds',

[paul.l..., 2015/02/13 18:26:17]

I'd prefer to remove the 2 lines of comments, and try something like:
'-Wno-error=array-bounds', # Workaround gcc bug 56273.

(it would be nice to use the full url to the bug:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56273, but I don't think it will
fit on one line. 

Same comment for 2 places below.

[Jakob Kummerow, 2015/02/14 13:01:56]

Either is fine; breaking the 80-col limit for long URLs is acceptable.

[svetozar.janjic, 2015/02/19 16:53:42]

Done.

+                ],
                 'ldflags': ['-EB'],
                 'conditions': [
                   [ 'v8_use_mips_abi_hardfloat=="true"', {
                     'cflags': ['-mhard-float'],
                     'ldflags': ['-mhard-float'],
                   }, {
                     'cflags': ['-msoft-float'],
                     'ldflags': ['-msoft-float'],
                   }],
                   ['mips_arch_variant=="r6"', {
@@ skipping 163 matching lines @@
             'defines': [
               '__mips_soft_float=1'
             ],
           }],
         ],
         'target_conditions': [
           ['_toolset=="target"', {
             'conditions': [
               ['v8_target_arch==target_arch and android_webview_build==0', {
                 # Target built with a Mips CXX compiler.
-                'cflags': ['-EL'],
+                'cflags': [
+                  '-EL',
+                  # Inhibit warning due to known issue present in the newer
+                  # versions of MIPS toolchain.
+                  '-Wno-error=array-bounds',
+                ],
                 'ldflags': ['-EL'],
                 'conditions': [
                   [ 'v8_use_mips_abi_hardfloat=="true"', {
                     'cflags': ['-mhard-float'],
                     'ldflags': ['-mhard-float'],
                   }, {
                     'cflags': ['-msoft-float'],
                     'ldflags': ['-msoft-float'],
                   }],
                   ['mips_arch_variant=="r6"', {
@@ skipping 179 matching lines @@
           }, {
             'defines': [
               '__mips_soft_float=1'
             ],
           }],
          ],
         'target_conditions': [
           ['_toolset=="target"', {
             'conditions': [
               ['v8_target_arch==target_arch and android_webview_build==0', {
-                'cflags': ['-EL'],
+                'cflags': [
+                  '-EL',
+                  # Inhibit warning due to known issue present in the newer
+                  # versions of MIPS toolchain.
+                  '-Wno-error=array-bounds',
+                ],
                 'ldflags': ['-EL'],
                 'conditions': [
                   [ 'v8_use_mips_abi_hardfloat=="true"', {
                     'cflags': ['-mhard-float'],
                     'ldflags': ['-mhard-float'],
                   }, {
                     'cflags': ['-msoft-float'],
                     'ldflags': ['-msoft-float'],
                   }],
                   ['mips_arch_variant=="r6"', {
@@ skipping 479 matching lines @@
           ['v8_enable_slow_dchecks==1', {
             'defines': [
               'ENABLE_SLOW_DCHECKS',
             ],
           }],
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }