[Scons-users] Action commands

[Tom Tanner (BLOOMBERG/ LONDON)]

It's in the generator. the code is something like this:

def generator(source, target, env, for_signature):
#    # Bad way corrupts env
#    env['THIS'] = 'echo'
#    return Action('$THIS blah')
    # Still bad way - doesn't propogate THIS
    return Action('$THIS blah', THIS='echo')

The generator has to return the action, I think?

From: bill at baddogconsulting.com At: 01/16/17 16:40:47
To: Tom Tanner (BLOOMBERG/ LONDON), scons-users at scons.org
Subject: Re: [Scons-users] Action commands

Try Action() without the env.
Assuming you're using the created object later and not just calling action by itself?

-Bill

On Mon, Jan 16, 2017 at 4:26 AM, Tom Tanner (BLOOMBERG/ LONDON) <ttanner2 at bloomberg.net> wrote:

I was quite surprised recently to find that if you (attempt to) pass it environment overrides it ignores them

so if you do

env.Command('$THIS blah', THIS='echo')

it does what is expected.

but

env.Action('$THIS blah', THIS='echo')

I've had occasion to want to do the latter when writing a Builder, or at least it has appeared that's what I've wanted to do, when one of env variables in the Action command is something that actually processes another environment variable. And I can't do this:

def generator(source, target, env, for_signature):
    env['THIS'] = 'echo'

because it corrupts env. And I tried cloning env inside the generator and returning a cloned_env.Action. That did not work out well.

So what can I do ?
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