[Mac/GN] Use a special .symbol_resolver to help load the ASan dynamic library.

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/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")
 
 # Contains the dependencies needed for sanitizers to link into executables and
 # shared_libraries. Unconditionally depend upon this target as it is empty if
 # |is_asan|, |is_lsan|, |is_tsan|, |is_msan| and |use_custom_libcxx| are false.
 group("deps") {
   public_deps = [
     ":deps_no_options",
   ]
   if (using_sanitizer) {
     public_configs = [
       ":sanitizer_options_link_helper",
 
       # Even when a target removes default_sanitizer_flags, it may be depending
       # on a library that did not remove default_sanitizer_flags. Thus, we need
       # to add the ldflags here as well as in default_sanitizer_flags.
       ":default_sanitizer_ldflags",
     ]
     deps = [
       ":options_sources",
     ]
+    if (is_mac) {
+      deps += [ ":asan_runtime_stubs" ]
+    }
   }
   if (use_afl) {
     deps += [ "//third_party/afl" ]
   }
 }
 
 group("deps_no_options") {
   if (using_sanitizer) {
     public_configs = [
       # Even when a target removes default_sanitizer_flags, it may be depending
@@ skipping 29 matching lines @@
     }
     if (is_mac) {
       data_deps = [
         ":copy_asan_runtime",
       ]
     }
   }
 }
 
 if (is_mac && using_sanitizer) {
-  copy("copy_asan_runtime") {
+  action("copy_asan_runtime") {
+    script = "//build/config/sanitizers/copy_asan_runtime.py"
+    _lib_name = "libclang_rt.asan_osx_dynamic.dylib"
     sources = [
-      "$clang_base_path/lib/clang/$clang_version/lib/darwin/libclang_rt.asan_osx_dynamic.dylib",
+      "$clang_base_path/lib/clang/$clang_version/lib/darwin/$_lib_name",
     ]
     outputs = [
-      "$root_out_dir/{{source_file_part}}",
+      "$root_out_dir/$_lib_name",
+    ]
+    args = rebase_path(sources + outputs, root_build_dir)
+  }
+
+  action("generate_asan_runtime_stubs") {
+    script = "//build/config/sanitizers/generate_asan_runtime_stubs.py"
+    inputs = get_target_outputs(":copy_asan_runtime")
+    outputs = [
+      "$target_gen_dir/asan_runtime_stubs.cc",
+    ]
+    args = rebase_path(inputs + outputs, root_build_dir)
+    deps = [ ":copy_asan_runtime" ]
+  }
+
+  source_set("asan_runtime_stubs") {
+    sources = get_target_outputs(":generate_asan_runtime_stubs")
+    deps = [ ":generate_asan_runtime_stubs" ]
+    configs = []
+    cflags = [
+      "-std=c++11",
+      "-mmacosx-version-min=10.7",
     ]
   }
 }
 
 config("sanitizer_options_link_helper") {
   if (is_mac) {
     ldflags = [ "-Wl,-U,_sanitizer_options_link_helper" ]
   } else if (!is_win) {
     ldflags = [ "-Wl,-u_sanitizer_options_link_helper" ]
   }
@@ skipping 69 matching lines @@
         ]
       }
       if (use_cfi_diag) {
         ldflags += [
           "-fno-sanitize-trap=cfi",
           "-fsanitize-recover=cfi",
         ]
       }
     }
   }
+
+  if (is_mac) {
+    ldflags += [ "-nodefaultlibs", "-lc++", "-lSystem", "-lc++abi" ]
+  }
 }
 
 config("common_sanitizer_flags") {
   cflags = []
   cflags_cc = []
 
   # Sanitizers need line table info for stack traces. They don't need type info
   # or variable info, so we can leave that out to speed up the build.
   if (using_sanitizer) {
     assert(is_clang, "sanitizers only supported with clang")
@@ skipping 248 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" ]
 }