third_party/mesa: turn off ubsan_vptr, since it's compiled without rtti.

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/sanitizers/sanitizers.gni")
 
 config("mesa_headers_config") {
   include_dirs = [ "src/include" ]
   if (!use_x11) {
     defines = [ "MESA_EGL_NO_X11_HEADERS" ]
   }
 }
 
 # This directory contains checked-in files generated from the Mesa build.
 generated_src_dir = "src/chromium_gensrc"
@@ skipping 250 matching lines @@
   configs = [ ":mesa_internal_config" ] + previous_configs + [
               ":mesa_internal_warnings",
               ":mesa_libglslcommon_warnings",
             ]
 
   if (is_clang) {
     # Mesa triggers some of these Clang warnings.
     configs -= [ "//build/config/clang:extra_warnings" ]
   }
 
+  # UBsan's vptr is not compatible with -fno-rtti,
+  # which is used by gallium/auxiliary/Makefile.
+  configs -= [ "//build/config/sanitizers:default_sanitizer_flags" ]
+  configs +=
+      [ "//build/config/sanitizers:default_sanitizer_flags_but_ubsan_vptr" ]
+
   deps = [
     ":mesa_headers",
   ]
 }
 
 static_library("mesa") {
   sources = [
     "$generated_src_dir/mesa/builtin_function.cpp",
     "$generated_src_dir/mesa/enums.c",
     "$generated_src_dir/mesa/glapi_mapi_tmp_shared.h",
@@ skipping 363 matching lines @@
   previous_configs = configs
   configs = []
   configs = [ ":mesa_internal_config" ] + previous_configs +
             [ ":mesa_internal_warnings" ]
 
   if (is_clang) {
     # Mesa triggers some of these Clang warnings.
     configs -= [ "//build/config/clang:extra_warnings" ]
   }
 
+  # UBsan's vptr is not compatible with -fno-rtti,
+  # which is used by gallium/auxiliary/Makefile.
+  configs -= [ "//build/config/sanitizers:default_sanitizer_flags" ]
+  configs +=
+      [ "//build/config/sanitizers:default_sanitizer_flags_but_ubsan_vptr" ]
+
   cflags = []
 
   if (is_android && !is_clang) {
     # Disable sincos() optimization to avoid a linker error
     # since Android's math library doesn't have sincos().
     # Either -fno-builtin-sin or -fno-builtin-cos works.
     cflags += [ "-fno-builtin-sin" ]
   }
 
   if (is_win) {
@@ skipping 34 matching lines @@
   configs = [ ":mesa_internal_config" ] + previous_configs +
             [ ":mesa_internal_warnings" ]
 
   include_dirs = [ "src/src/mesa/drivers" ]
 
   if (is_clang) {
     # Mesa triggers some of these Clang warnings.
     configs -= [ "//build/config/clang:extra_warnings" ]
   }
 
+  # UBsan's vptr is not compatible with -fno-rtti,
+  # which is used by gallium/auxiliary/Makefile.
+  configs -= [ "//build/config/sanitizers:default_sanitizer_flags" ]
+  configs +=
+      [ "//build/config/sanitizers:default_sanitizer_flags_but_ubsan_vptr" ]
+
   if (is_win) {
     sources += [ "src/src/mesa/drivers/osmesa/osmesa.def" ]
 
     # http://crbug.com/512956
     ldflags = [ "/ignore:4197" ]
 
     # TODO(brucedawson) : remove when crbug.com/482671 is resolved by
     # Microsoft.
     configs -= [ "//build/config/win:default_incremental_linking" ]
     configs += [ "//build/config/win:no_incremental_linking" ]
@@ skipping 31 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" ]
   }
 }