[Scons-users] env[X'] and signatures

[Tom Tanner (BLOOMBERG/ LONDON)]

I think he's talking the situation where you set env.env['MYVAR'], which means for something like this

env.env['MYVAR'] = 'Fish'
env.Command('some_random_script < $SOURCE > $TARGET', sources, targets)

and 'some_random_script' does

    #!/bin/sh
    echo $MYVAR

and you then change the SConscript file and set env.env['MYVAR'] to 'Chips', it won't cause a rebuild.


   

From: scons-users at scons.org At: 12/19/16 19:21:51
To: scons-users at scons.org
Subject: Re: [Scons-users] env[X'] and signatures

I'm not sure that all env[] vars have ever been hashed into each target.
Typically the command line, the sources, and if the builder is a python function the source of the python function goes into the target hash.

Any chance you can paste your python builder?
Or when you say python script, do you mean it calls a python script via command line?

On Sun, Dec 18, 2016 at 11:11 PM, Erling D. Andersen <e.d.andersen at mosek.com> wrote:

Hi

Assume you have

    env['MYVAR'] = 'something'

then is env['MYVAR'] hashed into the signature of the targets?


[Background info:

Note we have several builders that are Python scripts that uses the env as a source i.e. variables in the env. So if env['MYVAR'] is not hashed into the signature then things does not get rebuild as we hoped they should.]


-- 
Erling D. Andersen

MOSEK APS 
Fruebjergvej 3, 
Symbion Science Park Box 16, 
DK-2100 Copenhagen O

Ph: +45 7174 9373
Mo: +45 2362 9520

 
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