Remove "-mfloat-abi=hard" from host compiler cflags, which causes building chrome browser failure.

build/common.gypi

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@@ skipping 122 matching lines @@
                 'defines': [
                   'CAN_USE_VFP_INSTRUCTIONS',
                 ],
               }],
               [ 'v8_use_arm_eabi_hardfloat=="true"', {
                 'defines': [
                   'USE_EABI_HARDFLOAT=1',
                   'CAN_USE_VFP_INSTRUCTIONS',
                 ],
                 'cflags': [
                   '-mfloat-abi=hard',

[Jakob Kummerow, 2012/03/24 12:27:10]

I'd say that instead of first defining -mfloat-abi=hard and then conditionally
filtering it again, it would be cleaner to define it conditionally in the first
place:

'target_conditions': [
  ['_toolset=="target"', {
    'cflags': ['-mfloat-abi=hard',],
  }],
],

I think it's fine that this approach ignores the host_arch, as the host toolset
is used only at compile time anyway and its compile flags do not affect the
resulting target binaries.

                 ],
               }, {
                 'defines': [
                   'USE_EABI_HARDFLOAT=0',
                 ],
               }],
               # The ARM assembler assumes the host is 32 bits,
               # so force building 32-bit host tools.
               ['host_arch=="x64" or OS=="android"', {
                 'target_conditions': [
                   ['_toolset=="host"', {
                     'cflags': ['-m32'],
                     'ldflags': ['-m32'],
                   }],
                 ],
               }],
+              # Host compiler other than arm does not have "-mfloat-abi=hard"
+              # option, remove it from cflags.
+              ['host_arch!="arm"', {
+                'target_conditions': [
+                  ['_toolset=="host"', {
+                    'cflags!': ['-mfloat-abi=hard'],
+                  }],
+                ],
+              }],
             ],
           }],
           ['v8_target_arch=="ia32"', {
             'defines': [
               'V8_TARGET_ARCH_IA32',
             ],
           }],
           ['v8_target_arch=="mips"', {
             'defines': [
               'V8_TARGET_ARCH_MIPS',
@@ skipping 213 matching lines @@
                 # some test cases can cause stack overflow.
                 # 'StackReserveSize': '297152',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }