[Scons-users] Wacky crash in Clone()

[Bill Deegan]

What Mats said... ;)

Yes. Adding a bunch of extra logic and modifying/adding env variables to
the builder/action execution environments is probably best done in a
PsuedoBuilder..

On Wed, Feb 2, 2022 at 10:02 AM Mats Wichmann <mats at wichmann.us> wrote:

> On 2/2/22 08:05, Marc Branchaud via Scons-users wrote:
> > On 2022-01-25 14:57, Bill Deegan wrote:
> >> Can you be more specific about what info an action would want to
> >> change with the builder?
> >> More details = possible expert help on how to implement it in a "safe"
> >> way..
> >
> > Recall that I have a "BaseBuilder" and a "MyBuilder" that extends/adapts
> > it (I'm omitting the generate() and exists() functions):
>
> This looks like a use case for pseudo builders, via the AddMethod call.
> There are sone examples in the user guide
>
> https://scons.org/doc/production/HTML/scons-user.html#chap-add-method
>
> >
> >     site_scons/BaseBuilder.py
> >         def builder(target, source, env):
> >             # Do some bookkeeping, then run the build command:
> >             subprocess.call( ... )
> >
> >     site_scons/site_tools/MyBuilder.py
> >         import BaseBuilder
> >         def builder(target, source, env):
> >             # Set up stuff for the BaseBuilder, then run it.
> >             return BaseBuilder.builder(target, source, env)
> >
> > MyBuilder wants to do things like add extra options and/or set shell
> > environment variables for the command run by the BaseBuilder.
> >
> > There is also a "PlainBuilder" that just invokes the BaseBuilder
> > directly (I did not show this in my original message):
> >
> >     site_scons/site_tools/PlainBuilder.py
> >         import BaseBuilder
> >
> >         def generate(env, **kwargs):
> >             env['BUILDERS']['PlainBuilder'] = env.Builder(
> >                 action = env.Action(
> >                     BaseBuilder.builder,
> >                     BaseBuilder.message,
> >                 )
> >             )
> >
> > Invocations of PlainBuilder will themselves set their own options and/or
> > shell variables for the command.
> >
> > Whatever MyBuilder sets up for BaseBuilder should not pollute
> > PlainBuilder invocations of BaseBuilder.
> >
> > In SCons 2.x I did this by cloning the build environment inside
> > MyBuilder and tweaking the clone as needed.
> >
> > In SCons 4.x I changed this to use a module-level "overrides" dict
> > inside BaseBuilder.py.
> >
> > (Sorry for the slow replay.  After I managed to fix my problem, $work
> > priorities took over.)
> >
> >         M.
> >
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