[bug #39485] target specific make variables are incorrectly accumulated

[Paul D. Smith]

Update of bug #39485 (project make):

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

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Follow-up Comment #1:

This is defined as the correct behavior for target-specific variables; from
the GNU make manual:


   There is one more special feature of target-specific variables: when
you define a target-specific variable that variable value is also in
effect for all prerequisites of this target, and all their
prerequisites, etc. (unless those prerequisites override that variable
with their own target-specific variable value).


The idea is to support usages such as:


DEBUGFLAGS =
all: thisprog thatlib

debug: all
debug: DEBUGFLAGS = -g


Now when you run "make" you'll get the non-debug version (DEBUGFLAGS is
empty), but when you run "make debug" you get the debug version (DEBUGFLAGS is
set to -g).

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