Fix missing CRT libraries with ASAN unittests

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 287 matching lines @@
     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("sanitizer_default_libs") {
+  # The clang sanitizers (compiler-rt/ASAN) runtime requires functions from the
+  # CRT. This config must be added to targets that are removing the default
+  # libraries using the linker options "/NOENTRY", "/ENTRY" or "/NODEFAULTLIB".
+
+  if (is_asan && is_win) {
+    assert(!is_debug, "win/asan does not support linking with debug CRT")
+
+    if (is_component_build) {
+      libs = [
+        "msvcrt.lib",
+        "ucrt.lib",
+        "vcruntime.lib",
+      ]
+    } else {
+      libs = [
+        "libcmt.lib",
+        "libucrt.lib",
+        "libvcruntime.lib",
+      ]
+    }
+  }
+}
+
 config("asan_flags") {
   cflags = []
   if (is_asan) {
     cflags += [ "-fsanitize=address" ]
     if (!asan_globals) {
       cflags += [
         "-mllvm",
         "-asan-globals=0",
       ]
     }
@@ skipping 242 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" ]
 }