[Scons-users] Modifying the provided environment in an emitter?

[Andrew C. Morrow]

Thanks for the answer. I think cloning it would defeat my aim though. I
want the modified environment to apply to the target. If I clone it, I
don't think it possibly could. Or does each target have en env I can rebind
to the cloned and modified environment?

On Fri, Apr 21, 2017 at 5:34 PM, William Blevins <wblevins001 at gmail.com>
wrote:

> I would only do so on a clone of the provided environment in order to not
> modify the environment which may be used elsewhere.
>
> On Apr 21, 2017 5:29 PM, "Andrew C. Morrow" <andrew.c.morrow at gmail.com>
> wrote:
>
>>
>> Hi all -
>>
>> Is it legit to modify the passed in env in an emitter?
>>
>>     def add_lib_foo_emitter(target, source, env):
>>         libs = env.get('LIBS', [])
>>         libs.append('foo')
>>         env['LIBS'] = libs
>>         return (target, source)
>>
>>     def add_emitter(builder):
>>         base_emitter = builder.emitter
>>         new_emitter = SCons.Builder.ListEmitter([add_lib_foo_emitter,
>> base_emitter])
>>         builder.emitter = new_emitter
>>
>>     target_builders = ['Program', 'SharedLibrary', 'LoadableModule',
>> 'StaticLibrary']
>>     for builder in target_builders:
>>         add_emitter(env['BUILDERS'][builder])
>>
>> I've found myself wanting to do this with increasing frequency, but am
>> unclear on whether this is acceptable. It appears to work, but the
>> documentation doesn't seem to offer any clear guidance that I've found on
>> whether it is guaranteed to work. If so (which would be great!), am I
>> guaranteed that the modification of env is scoped only to the passed in
>> targets?
>>
>> Thanks,
>> Andrew
>>
>>
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>>
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