GN Windows build fixes

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 79 matching lines @@
   ldflags += [
     "/DELAYLOAD:dbghelp.dll",
     "/DELAYLOAD:dwmapi.dll",
     "/DELAYLOAD:shell32.dll",
     "/DELAYLOAD:uxtheme.dll",
   ]
 }
 
 # Subsystem --------------------------------------------------------------------
 
+# This is appended to the subsystem to specify a minimum version.
+if (current_cpu == "x64") {
+  # The number after the comma is the minimum required OS version.
+  # 5.02 = Windows Server 2003.
+  subsystem_version_suffix = ",5.02"
+} else {
+  # Don't specify a min version on x86.
+  subsystem_version_suffix = ""
+}
+
 config("console") {
-  ldflags = [ "/SUBSYSTEM:CONSOLE" ]
+  ldflags = [ "/SUBSYSTEM:CONSOLE$subsystem_version_suffix" ]
 }
 config("windowed") {
-  ldflags = [ "/SUBSYSTEM:WINDOWS" ]
+  ldflags = [ "/SUBSYSTEM:WINDOWS$subsystem_version_suffix" ]
 }
 
 # Incremental linking ----------------------------------------------------------
 
 incremental_linking_on_switch = [ "/INCREMENTAL" ]
 incremental_linking_off_switch = [ "/INCREMENTAL:NO" ]
 if (is_debug) {
   default_incremental_linking_switch = incremental_linking_on_switch
 } else {
   default_incremental_linking_switch = incremental_linking_off_switch
@@ skipping 47 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" ]
 }