Add support for building v8 on mips and mips64 using GN.

build/config/compiler/BUILD.gn

 # Copyright (c) 2013 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/toolchain.gni")
 import("//build_overrides/build.gni")
 
 if (current_cpu == "arm" || current_cpu == "arm64") {
   import("//build/config/arm.gni")
 }
-if (current_cpu == "mipsel" || current_cpu == "mips64el") {
+if (current_cpu == "mipsel" || current_cpu == "mips64el" ||
+    current_cpu == "mips" || current_cpu == "mips64") {
   import("//build/config/mips.gni")
 }
 if (is_mac) {
   import("//build/config/mac/symbols.gni")
 }
 if (is_ios) {
   import("//build/config/ios/ios_sdk.gni")
 }
 if (is_nacl) {
   # To keep NaCl variables out of builds that don't include NaCl, all
@@ skipping 666 matching lines @@
         }
       }
 
       if (mips_dsp_rev == 1) {
         cflags += [ "-mdsp" ]
       } else if (mips_dsp_rev == 2) {
         cflags += [ "-mdspr2" ]
       }
 
       cflags += [ "-m${mips_float_abi}-float" ]
+    } else if (current_cpu == "mips" && !is_nacl) {
+      if (mips_arch_variant == "r6") {
+        cflags += [
+          "-mips32r6",
+          "-Wa,-mips32r6",
+        ]
+        if (mips_use_msa == true) {
+          cflags += [
+            "-mmsa",
+            "-mfp64",
+          ]
+        }
+      } else if (mips_arch_variant == "r2") {
+        cflags += [
+          "-mips32r2",
+          "-Wa,-mips32r2",
+        ]
+        if (mips_float_abi == "hard" && mips_fpu_mode != "") {
+          cflags += [ "-m$mips_fpu_mode" ]
+        }
+      } else if (mips_arch_variant == "r1") {
+        cflags += [
+          "-mips32",
+          "-Wa,-mips32",
+        ]
+      }
+
+      if (mips_dsp_rev == 1) {
+        cflags += [ "-mdsp" ]
+      } else if (mips_dsp_rev == 2) {
+        cflags += [ "-mdspr2" ]
+      }
+
+      cflags += [ "-m${mips_float_abi}-float" ]
     } else if (current_cpu == "mips64el") {
       if (mips_arch_variant == "r6") {
         if (is_clang) {
           if (is_android) {
             cflags += [
               "--target=mips64el-linux-android",
               "-march=mips64el",
               "-mcpu=mips64r6",
             ]
             ldflags += [ "--target=mips64el-linux-android" ]
@@ skipping 11 matching lines @@
             "-mfp64",
           ]
         }
       } else if (mips_arch_variant == "r2") {
         cflags += [
           "-mips64r2",
           "-Wa,-mips64r2",
         ]
         ldflags += [ "-mips64r2" ]
       }
+    } else if (current_cpu == "mips64") {
+      if (mips_arch_variant == "r6") {
+        cflags += [
+          "-mips64r6",
+          "-Wa,-mips64r6",
+        ]
+        ldflags += [ "-mips64r6" ]
+        if (mips_use_msa == true) {
+          cflags += [
+            "-mmsa",
+            "-mfp64",
+          ]
+        }
+      } else if (mips_arch_variant == "r2") {
+        cflags += [
+          "-mips64r2",
+          "-Wa,-mips64r2",
+        ]
+        ldflags += [ "-mips64r2" ]
+      }
     } else if (current_cpu == "pnacl" && is_nacl_nonsfi) {
       if (target_cpu == "x86" || target_cpu == "x64") {
         cflags += [
           "-arch",
           "x86-32-nonsfi",
           "--pnacl-bias=x86-32-nonsfi",
           "--target=i686-unknown-nacl",
         ]
         ldflags += [
           "-arch",
@@ skipping 428 matching lines @@
     # In Chromium code, we define __STDC_foo_MACROS in order to get the
     # C99 macros on Mac and Linux.
     defines = [
       "__STDC_CONSTANT_MACROS",
       "__STDC_FORMAT_MACROS",
     ]
 
     if (!is_debug && !using_sanitizer &&
         (!is_linux || !is_clang || is_official_build) &&
         current_cpu != "s390x" && current_cpu != "s390" &&
-        current_cpu != "ppc64" && current_cpu != "ppc64") {
+        current_cpu != "ppc64" && current_cpu != "ppc64" &&
+        current_cpu != "mips" && current_cpu != "mips64") {
       # _FORTIFY_SOURCE isn't really supported by Clang now, see
       # http://llvm.org/bugs/show_bug.cgi?id=16821.
       # It seems to work fine with Ubuntu 12 headers though, so use it in
       # official builds.
       #
       # Non-chromium code is not guaranteed to compile cleanly with
       # _FORTIFY_SOURCE. Also, fortified build may fail when optimizations are
       # disabled, so only do that for Release build.
       defines += [ "_FORTIFY_SOURCE=2" ]
     }
@@ skipping 571 matching lines @@
 
 if (is_ios || is_mac) {
   # On Mac and iOS, this enables support for ARC (automatic ref-counting).
   # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
   config("enable_arc") {
     common_flags = [ "-fobjc-arc" ]
     cflags_objc = common_flags
     cflags_objcc = common_flags
   }
 }