Enable -Wdeprecated-register (except on CrOS and 32-bit Linux).

third_party/mesa/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/ui.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 config("mesa_headers_config") {
   include_dirs = [ "src/include" ]
@@ skipping 111 matching lines @@
 # configs.)
 config("mesa_internal_warnings") {
   cflags = []
   if (is_clang) {
     cflags += [
       "-Wno-tautological-constant-out-of-range-compare",
       "-Wno-mismatched-tags",  # Fixed upstream.
 
       # mesa's STATIC_ASSERT() macro expands to an ununused typedef.
       "-Wno-unused-local-typedef",
+
+      # mesa's flex scanner code uses "register" a lot.
+      "-Wno-deprecated-register",
     ]
   }
   if (is_win) {
     # TODO(scottmg): http://crbug.com/143877 These should be removed if
     # Mesa is ever rolled and the warnings are fixed.
     cflags += [
       "/wd4005",  # Macro defined twice.
       "/wd4018",  # Signed/unsigned mismatch in comparison.
       "/wd4065",  # Switch statement contains 'default' but no 'case' labels.
       "/wd4090",  # 'Operation' : different 'modifier' qualifiers
@@ skipping 638 matching lines @@
     deps = [
       "//third_party/wayland:wayland_util",
     ]
 
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [ "//build/config/compiler:no_chromium_code" ]
 
     public_configs = [ ":wayland_drm_protocol_config" ]
   }
 }