[bug #48360] Environment variable doesn't loose specialness, although redefined

[Paul D. Smith]

Update of bug #48360 (project make):

                  Status:                    None => Duplicate              
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #2:

It seems this is a duplicate of bug #46585.

The unique thing about this is perhaps some way to determine from within a
makefile whether a make variable is exported or not; currently neither the
flavor nor origin functions provide this information.  However, I don't know
that it's really that useful to query this: if you want the variable to be
exported you should export it, and if you want it to be guaranteed to not be
exported you should unexport it... I'm not sure testing the value first is a
useful thing to do.

I'm closing this as a duplicate for now but feel free to add comments if you
disagree.

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