[Scons-users] Dependencie with Sconscripts and builder's environment

[Bill Deegan]

Albert,

Can you provide an example of a change to an Environment() which should but
isn't causing a rebuild?
Preferably a small testcase we can run without your complete
environment/sources..

-Bill

On Tue, Oct 11, 2016 at 5:16 AM, Albert Arquer <albert.arquer at gmail.com>
wrote:

> Hello there
>
> We use scons intensively in our team to build our deliverables. We have
> many many sconscripts and we found out that we had to explicitly tell scons
> that a particular target depends upon those sconscripts
> self.env.Depends(target, scons_sources...).
>
> The reason for this is that while many times modification of our
> sconscripts are automatically caught by scons (because they have an impact
> in the dependency tree) other changes might be more subtle, for examples
> those changes which only modify a builder's environment.
> Ideally we would expect scons to detect changes in the builder's
> environment and realize the target generated by that builder is out-dated,
> however this is not what we have seen.. If a builder's env changes but no
> other dependencies or target/sources change, scons still says the target is
> up to date...
>
> Is this a known limitation of scons? if so, is there any workaround
> besides the one I already stated? or are we going about this all wrong?
>
> I find this weird as I have never seen any examples where a scons target
> was explicitly registered as dependent on the Sconscript which declared the
> target, so that makes me suspect there might be a better way to do this...
>
> Also another weird thing is that I have noticed scons is capable of
> detecting when a particular builder has changed, as is capable of isolating
> that change to the targets that actually use that builder, so why not
> compute the builder's signature combined with the environment?
>
> Thanks,
> Albert.
>
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