[bug #29757] Target-specific variables change their flavor

[Paul D. Smith]

Update of bug #29757 (project make):

                  Status:                    None => Not A Bug              
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #3:

Although you may find it undesirable, make is behaving correctly here.  A
variable assignment that appears in a target-specific context is not evaluated
AT ALL until the target is about to be invoked.  By the time the target is
invoked, the value of "deferred_var" is now "nothing" and so make's behavior
is correct.

The way in which target-specific variables work means that there is no
possible way in which they can be expanded when they are defined in the
makefile.  Remember that target-specific variables are _inherited_ via the
prerequisite relationship, so the initial value of static_var to append to
CANNOT BE KNOWN until the target is to be built, because only then do we know
what its parent target context is.

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  <http://savannah.gnu.org/bugs/?29757>

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