Chris Johns commented on a discussion: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5252#note_122978


I remembered why `rtems_waf` derives the environment. It is a copy and not a 
reference so `conf` instance's `env` is not polluted. Python copies the 
reference to a `dict` and you need a deep copy or you get cross-talk.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5252#note_122978
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