Attempt to fix Mac ASAN build in GN.

build/config/mac/BUILD.gn

 # Copyright (c) 2013 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/sysroot.gni")
 import("//build/config/ios/ios_sdk.gni")
 import("//build/config/mac/mac_sdk.gni")
 import("//build/config/mac/symbols.gni")
+import("//build/config/sanitizers/sanitizers.gni")
 
 # This is included by reference in the //build/config/compiler config that
 # is applied to all targets. It is here to separate out the logic.
 #
 # This is applied to BOTH desktop Mac and iOS targets.
 config("compiler") {
   # These flags are shared between the C compiler and linker.
   common_mac_flags = []
 
   # CPU architecture.
@@ skipping 66 matching lines @@
     # (Included by system header. Also exists on iOS but not included.)
     # http://opensource.apple.com/source/CarbonHeaders/CarbonHeaders-18.1/AssertMacros.h
     defines = [ "__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORE=0" ]
   }
 }
 
 # On Mac, this is used for everything except static libraries.
 config("mac_dynamic_flags") {
   ldflags = [ "-Wl,-ObjC" ]  # Always load Objective-C categories and classes.
 
-  if (is_component_build) {
+  if (is_component_build || is_asan) {
     ldflags += [
       # Path for loading shared libraries for unbundled binaries.
       "-Wl,-rpath,@loader_path/.",
 
       # Path for loading shared libraries for bundled binaries. Get back from
       # Binary.app/Contents/MacOS.
       "-Wl,-rpath,@loader_path/../../..",
     ]
   }
 }
@@ skipping 17 matching lines @@
     # after running "lipo" too.
     _enable_stripping = false
   } else {
     _enable_stripping = enable_stripping
   }
 
   if (_enable_stripping) {
     ldflags = [ "-Wcrl,strip,-x,-S" ]
   }
 }