[Scons-users] Variables 'Update' not adding variables to environment?

[William Blevins]

I need to do my usual questions: what version of SCons and Python are your
running. These are pretty important.

On Mon, Jan 25, 2016 at 12:09 PM, William Blevins <wblevins001 at gmail.com>
wrote:

> Please see the User's Guide for information regarding this topic:
> http://www.scons.org/doc/HTML/scons-user/ch10s02.html
>
> Here is a snippet:
>
> vars = Variables(None, ARGUMENTS)
> vars.Add('RELEASE', 'Set to 1 to build for release', 0)
> env = Environment(variables = vars)
>
>
> On Mon, Jan 25, 2016 at 8:56 AM, James Ramm <James.Ramm at jbarisk.com>
> wrote:
>
>> Hi
>>
>> I have the following in my SConstruct:
>>
>>
>>
>>     opts = Variables()
>>
>>     opts.AddVariables(
>>
>>         PathVariable('GDAL_INCLUDES', 'search path for gdal include
>> files' ,'/usr/local/include', PathVariable.PathAccept),
>>
>>         BoolVariable('DEBUG', 'compile in debug mode', 'False'),
>>
>>     )
>>
>>
>>
>>     env = Environment()
>>
>>     opts.Update(env)
>>
>
> I'm not sure what update does off the top of my head, but this isn't how
> the User's Guide shows the interaction of Variable and Environment. Try
> doing it the way that is shown in the User's Guide and see if that works. I
> will look at the Update function.
>
>
>>
>>
>> If I then `print env['GDAL_INCLUDES']` I get a key error:
>>
>>
>>
>>     KeyError: 'GDAL_INCLUDES':
>>
>>       File "…/SConstruct", line 69:
>>
>>         print env['GDAL_INCLUDES']
>>
>>       File "/usr/lib/scons/SCons/Environment.py", line 413:
>>
>>         return self._dict[key]
>>
>>
>>
>>
>>
>> I can, however, do `print env['DEBUG']` and it correctly writes `False`
>>
>>
>>
>> Any idea whats going on?
>>
>>
>>
>>
>>
>> Thanks
>>
>> *James Ramm*
>>
>> *Software Developer*
>>
>>
>>
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