[Scons-users] Merging Environments, Revisited!

[Brian Cody]

Sorry, I wasn't clear. My intention already takes environments.

def create_modelsim_xilinx_env(modelsim_env, xilinx_env):
   new_env = ...

While ... will be several lines. I'm asking for most generic way to do this. The suggestion was to treat the environments as dictionaries, but the method for doing this for a dictionary (copy, update) doesn't work just work

Thanks

Sent from my iPad

> On Mar 30, 2015, at 1:23 PM, Bill Deegan <bill at baddogconsulting.com> wrote:
> 
> Change your helper function to optionally take an environment as a parameter.
> -Bill
> 
>> On Mon, Mar 30, 2015 at 12:11 PM, Brian Cody <brian.j.cody at gmail.com> wrote:
>> This is a timely response to this message, and I'm asking for help:
>> 
>> 
>> Gary Oberbrunner-: Aug 05, 2011; 1:39pm Re: Merge two environments?
>> How would you like them combined?  Replace?  Append?  Merge?  Think
>> about something like LIBS or CPPDEFINES which are themselves lists or
>> dicts, or other vars which are python functions.  Anyway, whatever
>> scheme you like could be implemented because you can treat an env just
>> like a dict: iterate over its members and do whatever you like to each
>> one.
>> 
>> On Fri, Aug 5, 2011 at 7:16 AM, Julius Ziegler <[hidden email]> wrote:
>> 
>> > Hello,
>> >
>> > I wonder if there is a systematic way to merge all the flags contained
>> > in two Environments?
>> >
>> > I would like to do somehting like this (random example):
>> >
>> > env_Qt  = ... # setup an environment for building Qt stuff
>> > env_png = ... # setup an environment for building something that uses libpng
>> >
>> > env_Qt_png = env_Qt.Clone()
>> > env_Qt_png.MergeFlags(env_png) # have an environment which combines both
>> >
>> > The last call of course does not work, since it expects either a gcc-ish
>> > string ("-lpng"), or a dictionary.
>> >
>> > Is there a canonic way to achieve this?
>> >
>> > Thanks!
>> > Julius
>> 
>> 
>> 
>> In this case I have a helper function to set up an environment for Xilinx. I have a helper function to set up an environment for Modelsim. These are used separately (Xilinx for building projects, Modelsim for running tests on code) and there are input variables into each. To properly test with Xilinx built-ins, there is a step where you invoke Xilinx to invoke Modelsim to compile Xilinx's built-ins for simulation. I want to have a helper that takes a Xilinx environment and a Modelsim environment and spits out an environment suitable for that particular combination of the tools and settings. I'd like the helper to know the bare minimum of the internals of those environments so when something needs to change, there's the least amount of work possible.
>> 
>> In the post above, Gary mentioned that you can treat the environments like a dictionary. The way to combine two dictionaries is usually (depending on what you want to do with the collisions):
>> new_dict = dict1.copy()
>> new_dict.update(dict2)
>> 
>> This doesn't actually work though. The environments are not dictionary-like enough to have a copy() method. Could someone suggest an alternative? If I had this behavior, I think the only other step I'd need to do would be to manually modify the path variable. 
>> 
>> Thank you
>> 
>> 
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