ninja windows: workaround for too long names

pylib/gyp/generator/ninja.py

Index: pylib/gyp/generator/ninja.py
diff --git a/pylib/gyp/generator/ninja.py b/pylib/gyp/generator/ninja.py
index 2def4b1c18817348bb4bd1de90ec8ec4f44a3bad..5a4777e7d49b7f9dbaed894f14fa489e08da37b5 100644
--- a/pylib/gyp/generator/ninja.py
+++ b/pylib/gyp/generator/ninja.py
@@ -9,6 +9,7 @@ import gyp.msvs_emulation
 import gyp.MSVSVersion
 import gyp.system_test
 import gyp.xcode_emulation
+import hashlib
 import os.path
 import re
 import subprocess
@@ -616,7 +617,7 @@ class NinjaWriter:
         inputs = map(self.GypPathToNinja, inputs)
         outputs = map(self.GypPathToNinja, outputs)
         extra_bindings.append(('unique_name',
-            re.sub('[^a-zA-Z0-9_]', '_', outputs[0])))
+            hashlib.md5(re.sub('[^a-zA-Z0-9_]', '_', outputs[0])).hexdigest()))
         self.ninja.build(outputs, rule_name, self.GypPathToNinja(source),
                          implicit=inputs,
                          order_only=prebuild,
@@ -1101,7 +1102,7 @@ class NinjaWriter:
     if self.toolset == 'target':
       rule_name += '.' + self.toolset
     rule_name += '.' + name
-    rule_name = re.sub('[^a-zA-Z0-9_]', '_', rule_name)
+    rule_name = hashlib.md5(re.sub('[^a-zA-Z0-9_]', '_', rule_name)).hexdigest()
 
     args = args[:]