[Scons-users] Not clobbering autodetected HOST_ARCH when configured via Options

[Gary Oberbrunner]

On Wed, Jul 9, 2014 at 2:07 PM, Andrew C. Morrow <andrew.c.morrow at gmail.com>
wrote:

> ...
> Environment(
>     tools=['tool'],
>     TOOL_OPT=None,
> )
>
> may not be equivalent to
>
> Environment(
>     tools=['tool'],
> )
>
> Which means you can't write:
>
> Environment(
>     tools=['tool'],
>     TOOL_OPT=GetOption('tool-opt'),
> )...
>

Yes, you're right.  The problem is that the tool code is checking for the
_presence_ of that construction variable.  The tools really shouldn't do
that; a better pattern would be
  if env.get('TOOL_OPT'):
rather than
 if TOOL_OPT in env
or whatever it's doing now.

Your **kwargs solution should also work, as a workaround.

-- 
Gary
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