idempotent change propagation

using lastModified instead of a non-idempotent needsUpdate flag
this fixes a bug where dependees would not be rebuilt if cbt exited
or was killed after dependencies were already rebuilt.

1 files changed, 10 insertions, 0 deletions

diff --git a/compatibility/IncompatibleCbtVersionException.java b/compatibility/IncompatibleCbtVersionException.java
new file mode 100644
index 0000000..dee50fb
--- /dev/null
+++ b/compatibility/IncompatibleCbtVersionException.java
@@ -0,0 +1,10 @@
+package cbt;
+
+public class IncompatibleCbtVersionException extends RuntimeException{
+	public IncompatibleCbtVersionException( String msg, Throwable parent ){
+		super( msg, parent );
+	}
+	public IncompatibleCbtVersionException( String msg ){
+		super( msg );
+	}
+}