Laying the groundwork for targeting WinRT.

build/config/win/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/win/visual_studio_version.gni")
 
 # Compiler setup for the Windows SDK. Applied to all targets.
 config("sdk") {
   # The include path is the stuff returned by the script.
   #include_dirs = msvc_config[0]  TODO(brettw) make this work.
@@ skipping 161 matching lines @@
 
 # Nominmax --------------------------------------------------------------------
 
 # Some third party code defines NOMINMAX before including windows.h, which
 # then causes warnings when it's been previously defined on the command line.
 # For such targets, this config can be removed.
 
 config("nominmax") {
   defines = [ "NOMINMAX" ]
 }
+
+# Target WinRT ----------------------------------------------------------------
+
+# When targeting Windows Runtime, certain compiler/linker flags are necessary.
+
+config("target_winrt") {
+  defines = [
+    "WINRT",
+    "WINAPI_FAMILY=WINAPI_FAMILY_PC_APP",
+  ]
+  cflags_cc = [
+    "/ZW",
+    "/EHsc",
+  ]
+}