[Scons-users] flow of target handling

[Bill Deegan]

I'm not really sure what you're asking.
If a dependency of a target changes, the target should be rebuilt.

Perhaps if you can craft a simple reproducer, that might explain better?

On Mon, Aug 17, 2020 at 9:45 AM daggs <daggs at gmx.com> wrote:

> Greetings,
>
> I want to inquire what does scons does for the target of an action if it
> detects one of it's deps have changed.
> the reason I'm asking is that I have an action that runs a script, the
> script is part of the deps (e.g. exists)
> and the target is a file generated by the script (named fileA).
> the action is a dep of multiple other actions.
> what I see is that scons decides to rebuild the target because it's
> detects the script has changed so it rebuilds it.
> just for the sake of the test, I've changed the script to create fileA and
> fileB and if fileB is changed the script gets executed.
> I've expected no see one execution but I see two.
>
> so I'm having hard time to understand how scons works in this situation.
>
> can anyone help understand the behavior?
>
> Thanks,
>
> Dagg.
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