win: x86 targets XP subsystem

pylib/gyp/msvs_emulation.py

Index: pylib/gyp/msvs_emulation.py
diff --git a/pylib/gyp/msvs_emulation.py b/pylib/gyp/msvs_emulation.py
index 3ac153dd862b40bf470e57f56238af33e81cf1a8..5f6363a862f5a110850cfee06caf4c4bb195c490 100644
--- a/pylib/gyp/msvs_emulation.py
+++ b/pylib/gyp/msvs_emulation.py
@@ -466,7 +466,17 @@ class MsvsSettings(object):
         else '/MAP'})
     ld('MapExports', map={'true': '/MAPINFO:EXPORTS'})
     ld('AdditionalOptions', prefix='')
-    ld('SubSystem', map={'1': 'CONSOLE', '2': 'WINDOWS'}, prefix='/SUBSYSTEM:')
+
+    xp_version = ''
+    # If we're targeting x86, make sure we're targeting XP.
+    if self._Setting(('VCLinkerTool', 'TargetMachine'),
+                     config, default='1') == '1':
+      xp_version = ',5.01'
+    ld('SubSystem',
+       map={'1': 'CONSOLE%s' % xp_version,
+            '2': 'WINDOWS%s' % xp_version},
+       prefix='/SUBSYSTEM:')
+
     ld('TerminalServerAware', map={'1': ':NO', '2': ''}, prefix='/TSAWARE')
     ld('LinkIncremental', map={'1': ':NO', '2': ''}, prefix='/INCREMENTAL')
     ld('FixedBaseAddress', map={'1': ':NO', '2': ''}, prefix='/FIXED')