Fix a --implicit-cache when a file has no implicit deps and its source is generated. (Anthony Roach)

2 files changed, 5 insertions, 2 deletions

diff --git a/src/CHANGES.txt b/src/CHANGES.txt
index 5dd578e..ad07cf7 100644
--- a/src/CHANGES.txt
+++ b/src/CHANGES.txt
@@ -37,6 +37,9 @@ RELEASE 0.08 -
   - Fix --implicit-cache causing redundant rebuilds when the header
     file list changed.
 
+  - Fix --implicit-cache when a file has no implicit dependencies and
+    its source is generated.
+
   From Zed Shaw:
 
   - Add an Append() method to Environments, to append values to
diff --git a/src/engine/SCons/Sig/__init__.py b/src/engine/SCons/Sig/__init__.py
index 386c9e5..40ee459 100644
--- a/src/engine/SCons/Sig/__init__.py
+++ b/src/engine/SCons/Sig/__init__.py
@@ -82,13 +82,13 @@ class SConsignEntry:
         return '%s %s %s %s' % (timestamp, bsig, csig, implicit)
 
     def get_implicit(self):
-        if self.implicit is None:
+        if not self.implicit:
             return None
         else:
             return string.split(self.implicit, '\0')
 
     def set_implicit(self, implicit):
-        if implicit is None:
+        if not implicit:
             self.implicit = None
         else:
             self.implicit = string.join(map(str, implicit), '\0')