MIPS: Initial gyp infrastructure for MIPS architecture.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 230b1fd7a8ea931975b53275f0510c0de2031567..159764408ea4f70a976cfe80799a751a8afa6990 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -50,12 +50,18 @@
     # probing when running on the target.
     'v8_can_use_vfp_instructions%': 'false',
 
+    # Similar to vfp but on MIPS.
+    'v8_can_use_fpu_instructions%': 'true',
+
     # Setting v8_use_arm_eabi_hardfloat to true will turn on V8 support for ARM
     # EABI calling convention where double arguments are passed in VFP
     # registers. Note that the GCC flag '-mfloat-abi=hard' should be used as
     # well when compiling for the ARM target.
     'v8_use_arm_eabi_hardfloat%': 'false',
 
+    # Similar to the ARM hard float ABI but on MIPS.
+    'v8_use_mips_abi_hardfloat%': 'true',
+
     'v8_enable_debugger_support%': 1,
 
     'v8_enable_disassembler%': 0,
@@ -154,6 +160,33 @@
             'defines': [
               'V8_TARGET_ARCH_MIPS',
             ],
+            'conditions': [
+              [ 'v8_can_use_fpu_instructions=="true"', {
+                'defines': [
+                  'CAN_USE_FPU_INSTRUCTIONS',
+                ],
+              }],
+              [ 'v8_use_mips_abi_hardfloat=="true"', {
+                'defines': [
+                  '__mips_hard_float=1',
+                  'CAN_USE_FPU_INSTRUCTIONS',
+                ],
+              }, {
+                'defines': [
+                  '__mips_soft_float=1'
+                ],
+              }],
+              # The MIPS assembler assumes the host is 32 bits,
+              # so force building 32-bit host tools.
+              ['host_arch=="x64"', {
+                'target_conditions': [
+                  ['_toolset=="host"', {
+                    'cflags': ['-m32'],
+                    'ldflags': ['-m32'],
+                  }],
+                ],
+              }],
+            ],
           }],
           ['v8_target_arch=="x64"', {
             'defines': [