Fix "Ignoring corrupt sconsign entry" warnings when upgrading from 1.x.

2 files changed, 17 insertions, 3 deletions

diff --git a/src/RELEASE.txt b/src/RELEASE.txt
index faa0e66..4a21fa7 100644
--- a/src/RELEASE.txt
+++ b/src/RELEASE.txt
@@ -42,7 +42,21 @@
 
   CHANGED/ENHANCED EXISTING FUNCTIONALITY
 
-  - None.
+  - Any Command() or env.Command() calls that use the following Action
+    factory functions will have their targets rebuilt when upgrading
+    from any pre-2.0 release:
+
+        Chmod()
+        Copy()
+        Delete()
+        Mkdir()
+        Move()
+        Touch()
+
+    (The rebuild occurs because the underlying Python class that
+    implements these functions has been changed to a new-style Python
+    class, and that changes the Python byte code and therefore the
+    build signature of the functions.)
 
   FIXES
 
diff --git a/src/engine/SCons/Node/__init__.py b/src/engine/SCons/Node/__init__.py
index 79ba730..0bf490f 100644
--- a/src/engine/SCons/Node/__init__.py
+++ b/src/engine/SCons/Node/__init__.py
@@ -105,7 +105,7 @@ class NodeInfoBase(object):
     logic for dealing with their own Node-specific signature information.
     """
     current_version_id = 1
-    def __init__(self, node):
+    def __init__(self, node=None):
         # Create an object attribute from the class attribute so it ends up
         # in the pickled data in the .sconsign file.
         self._version_id = self.current_version_id
@@ -158,7 +158,7 @@ class BuildInfoBase(object):
     implicit dependencies, and action information.
     """
     current_version_id = 1
-    def __init__(self, node):
+    def __init__(self, node=None):
         # Create an object attribute from the class attribute so it ends up
         # in the pickled data in the .sconsign file.
         self._version_id = self.current_version_id