gn: Fix build on Windows

BUILD.gn

 # Copyright 2014 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/arm.gni")
 import("//build/config/android/config.gni")
 import("//third_party/libvpx/libvpx_srcs.gni")
 import("//third_party/yasm/yasm_assemble.gni")
 
 if (is_posix && !is_mac) {
@@ skipping 23 matching lines @@
   cpu_arch_full = cpu_arch
 }
 
 config("libvpx_config") {
   include_dirs = [
     "//third_party/libvpx/source/config",
     "//third_party/libvpx/source/config/$os_category/$cpu_arch_full",
     "//third_party/libvpx/source/libvpx",
     "$root_gen_dir/third_party/libvpx", # Provides vpx_rtcd.h.
   ]
-  cflags = [ "-Wno-unused-function", "-Wno-sign-compare" ]
+  if (!is_win) {
+    cflags = [ "-Wno-unused-function", "-Wno-sign-compare" ]
+  }
 }
 
 # This config is applied to targets that depend on libvpx.
 config("libvpx_external_config") {
   include_dirs = [
     "//third_party/libvpx/source/libvpx",
   ]
 }
 
 executable("libvpx_obj_int_extract") {
   sources = [
     "//third_party/libvpx/source/libvpx/build/make/obj_int_extract.c"
   ]
   configs += [ ":libvpx_config" ]
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
   if (is_android_webview_build) {
     defines += [ "FORCE_PARSE_ELF" ]
     include_dirs += [ "//third_party/libvpx/include" ]
   }
 }
 
 # A library whose object files contain integers to be extracted.
 static_library("libvpx_asm_offsets") {
   sources = [
     "//third_party/libvpx/source/libvpx/vp8/encoder/vp8_asm_enc_offsets.c",
     "//third_party/libvpx/source/libvpx/vpx_scale/vpx_scale_asm_offsets.c"
   ]
   configs += [ ":libvpx_config" ]
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
   if (is_clang) {
     cflags = [ "-Wno-unused-function" ]
   }
 }
 
 # This works only on POSIX to extract integer values from an object file.
 template("obj_int_extract") {
   action(target_name) {
     script = "//third_party/libvpx/obj_int_extract.py"
     bin_label = "//third_party/libvpx($host_toolchain)"
 
     args = [
       "-e",
       "./" + rebase_path(get_label_info(bin_label, "root_out_dir") +
                          "/libvpx_obj_int_extract",
                          root_build_dir)
     ]
 
     if (cpu_arch == "arm") {
       args += [ "-f", "gas" ]
     } else {
       args += [ "-f", "rvds" ]
     }
 
+    if (is_win) {
+      obj_extension = "obj"
+    } else {
+      obj_extension = "o"
+    }
+
     args += [
       "-b",
       rebase_path(get_label_info(":libvpx_asm_offsets", "target_out_dir")) +
           "/" + invoker.src_dir + "/libvpx_asm_offsets." +
-          invoker.obj_file_root + ".o"
+          invoker.obj_file_root + ".${obj_extension}"
     ]
     out_file = "$target_gen_dir/" + invoker.obj_file_root + ".asm"
     args += [ "-o", rebase_path(out_file) ]
     outputs = [ out_file ]
     deps = [
       ":libvpx_asm_offsets",
       ":libvpx_obj_int_extract($host_toolchain)"
     ]
   }
 }
@@ skipping 25 matching lines @@
     ]
     deps = [
       ":gen_asm_offsets_vp8",
       ":gen_asm_offsets_scale",
     ]
   }
 }
 
 static_library("libvpx_intrinsics_mmx") {
   configs += [ ":libvpx_config" ]
-  cflags = [ "-mmmx" ]
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+  if (!is_win) {
+    cflags = [ "-mmmx" ]
+  }
   if (cpu_arch == "x86") {
     sources = libvpx_srcs_x86_mmx
   } else if (cpu_arch == "x64") {
     sources = libvpx_srcs_x86_64_mmx
   }
 }
 
 static_library("libvpx_intrinsics_sse2") {
   configs += [ ":libvpx_config" ]
-  cflags = [ "-msse2" ]
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+  if (!is_win) {
+    cflags = [ "-msse2" ]
+  }
   if (cpu_arch == "x86") {
     sources = libvpx_srcs_x86_sse2
   } else if (cpu_arch == "x64") {
     sources = libvpx_srcs_x86_64_sse2
   }
 }
 
 static_library("libvpx_intrinsics_ssse3") {
   configs += [ ":libvpx_config" ]
-  cflags = [ "-mssse3" ]
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+  if (!is_win) {
+    cflags = [ "-mssse3" ]
+  }
   if (cpu_arch == "x86") {
     sources = libvpx_srcs_x86_ssse3
   } else if (cpu_arch == "x64") {
     sources = libvpx_srcs_x86_64_ssse3
   }
 }
 
 static_library("libvpx_intrinsics_sse4_1") {
   configs += [ ":libvpx_config" ]
-  cflags = [ "-msse4.1" ]
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+  if (!is_win) {
+    cflags = [ "-msse4.1" ]
+  }
   if (cpu_arch == "x86") {
     sources = libvpx_srcs_x86_sse4_1
   } else if (cpu_arch == "x64") {
     sources = libvpx_srcs_x86_64_sse4_1
   }
 }
 
 if (cpu_arch_full == "arm-neon-cpu-detect") {
   static_library("libvpx_intrinsics_neon") {
     configs -= [ "//build/config/compiler:compiler_arm_fpu" ]
@@ skipping 61 matching lines @@
       sources = libvpx_srcs_arm_neon
     } else if (is_android) {
       sources = libvpx_srcs_arm_neon_cpu_detect
     } else {
       sources = libvpx_srcs_arm
     }
   } else if (cpu_arch == "arm64") {
     sources = libvpx_srcs_arm64
   }
   configs += [ ":libvpx_config" ]
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
   deps = []
   if (cpu_arch == "x86" || (cpu_arch == "x64" && !is_msan)) {
     deps += [
       ":libvpx_yasm",
       ":libvpx_intrinsics_mmx",
       ":libvpx_intrinsics_sse2",
       ":libvpx_intrinsics_ssse3",
       ":libvpx_intrinsics_sse4_1",
     ]
   }
   if (cpu_arch_full == "arm-neon-cpu-detect") {
     deps += [ ":libvpx_intrinsics_neon" ]
   }
   if (is_android) {
     deps += [ "//third_party/android_tools:cpu_features" ]
   }
   if (cpu_arch == "arm") {
     deps += [ ":libvpx_assembly_arm" ]
   }
 
   public_configs = [ ":libvpx_external_config" ]
 }