Move libc++ configs and flags out of //build/config/sanitizers

build/config/sanitizers/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_overrides/build.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/clang/clang.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/toolchain.gni")
@@ skipping 263 matching lines @@
 
     # Disable frame pointer elimination for better stack traces.
     if (is_posix) {
       cflags += [ "-fno-omit-frame-pointer" ]
     } else {
       cflags += [ "/Oy-" ]
     }
   }
 }
 
-# TODO(thomasanderson): Move this out of build/config/sanitizers.
-config("libcxx_flags") {
-  if (use_custom_libcxx) {
-    prefix = "//buildtools/third_party"
-    include = "trunk/include"
-    cflags_cc = [
-      "-nostdinc++",
-      "-isystem" + rebase_path("$prefix/libc++/$include", root_build_dir),
-      "-isystem" + rebase_path("$prefix/libc++abi/$include", root_build_dir),
-    ]
-  }
-}
-
 config("asan_flags") {
   cflags = []
   if (is_asan) {
     cflags += [ "-fsanitize=address" ]
     if (!is_mac) {
       cflags += [ "-fsanitize-address-use-after-scope" ]
     } else {
       # https://crbug.com/708707
       cflags += [ "-fno-sanitize-address-use-after-scope" ]
     }
@@ skipping 225 matching lines @@
 }
 
 config("fuzzing_build_mode") {
   if (use_libfuzzer || use_afl) {
     defines = [ "FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION" ]
   }
 }
 
 all_sanitizer_configs = [
   ":common_sanitizer_flags",
-  ":libcxx_flags",
   ":coverage_flags",
   ":default_sanitizer_ldflags",
   ":asan_flags",
   ":cfi_flags",
   ":lsan_flags",
   ":msan_flags",
   ":tsan_flags",
   ":ubsan_flags",
   ":ubsan_no_recover",
   ":ubsan_null_flags",
@@ skipping 18 matching lines @@
 # This allows to selectively disable ubsan_vptr, when needed. In particular,
 # if some third_party code is required to be compiled without rtti, which
 # is a requirement for ubsan_vptr.
 config("default_sanitizer_flags_but_ubsan_vptr") {
   configs = all_sanitizer_configs - [ ":ubsan_vptr_flags" ]
 }
 
 config("default_sanitizer_flags_but_coverage") {
   configs = all_sanitizer_configs - [ ":coverage_flags" ]
 }