[Scons-users] Builder Chains Not Working?

[William Deegan]

Mark,

On 11/15/2012 05:45 PM, Mark Ribau wrote:

> Builder1 creates transmogrifies data from one structure to another.

> MultiBuilder1 more or less concatenates data.

> The output from the first group MultiBuilder1 calls is then passed 

> into MultiBuilder1 again with other data to merge that.  The reason 

> for this step is so that we can examine the generated input and inject 

> some manual input.

>

> Oh yea, I've actually wrapped .Alias in a function (Method) that does 

> some extra stuff, forgot to remove it's extra argument.  The wrapper 

> function ends up doing env.Alias(target, source) ultimately.

>

> My understanding was that a PseudoBuilder is a function and does not 

> get an emitter or scanner.

Right. It's for sticking a bunch of logic onto the env.
Generally for doing things like chaining commands.


> Builder1 requires those.  I need a way such that when source0.json is 

> being built by a particular builder (Builder1), that MultiBuilder1 

> also gets run on it, passing in a specific target, and it emits a 

> second target as well.


Sounds like pseudo builder to me. Emitter's not really meant to do what 
you're doing.
It's meant to modify the source/target list.

A scanner could do what you want. But a pseudo builder would be the 
simplest.
But if it's working for you..

> Doing this in the Emitter does work.  Doing it in the Build function 

> had issues because it ran far too late for dependency checking to pick 

> changes up.  I'm just trying to figure out why the three ret's need to 

> be aliased when I've never had to do that before for anything else 

> like this.  With or without the alias calls, the dependency graph 

> looks correct and just like the other ones I've generated.  Is it b/c 

> they are .json files and it gets confused by not being able to have a 

> input/output suffix chain?


Try getting rid of the extra alias()'s and use scons --debug=explain.
Don't think its .json.


-Bill
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