Fixed Gyp Xcode generator for libraries with identical names.

pylib/gyp/xcodeproj_file.py

Index: pylib/gyp/xcodeproj_file.py
diff --git a/pylib/gyp/xcodeproj_file.py b/pylib/gyp/xcodeproj_file.py
index a9deb1549e086c5166bac32b986c5d0a500ad806..702e773ce2ed4438bdec215e88c6d8be2fd71967 100644
--- a/pylib/gyp/xcodeproj_file.py
+++ b/pylib/gyp/xcodeproj_file.py
@@ -2808,6 +2808,16 @@ class PBXProject(XCContainerPortal):
           product_group._properties['children'],
           cmp=lambda x, y, rp=remote_products: CompareProducts(x, y, rp))
 
+  def Hashables(self):
+    # super
+    hashables = XCObject.Hashables(self)
+
+    # Projects (.xcodeproj) files with identical names defining products with
+    # identical names cause a false positive hash ID collision. We add the
+    # project file's path to the hashables to avoid this.
+    hashables.extend([self._properties['projectRoot']])
+    return hashables
+
 
 class XCProjectFile(XCObject):
   _schema = XCObject._schema.copy()