[Scons-users] Handling of dependencies using Scanner()

[Henry Gomersall]

I've built a tool for handling Jinja templates. As part of this, I've 
made a Scanner that inspects the jinja templates and extracts the files 
that it depends upon (it acquires with include or extends).

I've added the Scanner to the environment, and with suitable print 
statements I can observe the scanner in operation, and note that it is 
successfully extracting all the filenames (from which the node list is 
created and returned).

The question is this: Once the nodes on which the current node depends 
are extracted and returned by the scanner function, I would expect those 
nodes to be part of the dependency tree - that is, modifications to 
those nodes would trigger a rebuild of the dependent file. This does not 
seem to be happening with me.

I can only assume that there is an additional step to make the nodes 
part of the dependency tree. To be clear, I don't need to explicitly 
build those nodes that are returned from the scanner function, just that 
modifications to those nodes causes a rebuild.

Some clarification on this would be much appreciated!

Many thanks,

Henry