libvpx: Prevent unintended targets to be built with msan.

third_party/libvpx/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("//build/config/sanitizers/sanitizers.gni")
 import("//third_party/libvpx/libvpx_srcs.gni")
 import("//third_party/yasm/yasm_assemble.gni")
 
@@ skipping 72 matching lines @@
       "-Wno-sign-compare",
     ]
   }
 }
 
 # This config is applied to targets that depend on libvpx.
 config("libvpx_external_config") {
   include_dirs = [ "//third_party/libvpx/source/libvpx" ]
 }
 
-if (current_cpu == "x86" || current_cpu == "x64") {
+if (current_cpu == "x86" || (current_cpu == "x64" && !is_msan)) {
   yasm_assemble("libvpx_yasm") {
     if (current_cpu == "x86") {
       sources = libvpx_srcs_x86_assembly
     } else if (current_cpu == "x64") {
       sources = libvpx_srcs_x86_64_assembly
     }
 
     defines = [ "CHROMIUM" ]
     if (is_android) {
       # On Android, define __ANDROID__ to use alternative standard library
       # functions.
       defines += [ "__ANDROID__" ]
     }
     include_dirs = [
       platform_include_dir,
       "//third_party/libvpx/source/config",
       "//third_party/libvpx/source/libvpx",
       target_gen_dir,
     ]
   }
 }
 
-if (current_cpu == "x86" || current_cpu == "x64") {
+if (current_cpu == "x86" || (current_cpu == "x64" && !is_msan)) {
   # The following targets are deliberately source_set rather than
   # static_library. The :libvpx target exposes these intrinsic implementations
   # via global function pointer symbols, which hides the object dependency at
   # link time. On Mac, this results in undefined references to the intrinsic
   # symbols.
 
   source_set("libvpx_intrinsics_mmx") {
     configs += [ ":libvpx_config" ]
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [ "//build/config/compiler:no_chromium_code" ]
@@ skipping 188 matching lines @@
   }
   if (is_android) {
     deps += [ "//third_party/android_tools:cpu_features" ]
   }
   if (current_cpu == "arm") {
     deps += [ ":libvpx_assembly_arm" ]
   }
 
   public_configs = [ ":libvpx_external_config" ]
 }