[bug #25697] Segmentation fault setting .DEFAULT_GOAL

[Paul D. Smith]

Update of bug #25697 (project make):

                  Status:                    None => Fixed                  
             Assigned to:                    None => psmith                 
             Open/Closed:                    Open => Closed                 
           Fixed Release:                    None => CVS                    

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Follow-up Comment #2:

The issue here is by doing this:

.DEFAULT_GOAL := $(myDefaultGoal)  #restore the previous default rule

you are actually setting the .DEFAULT_GOAL variable to contain a single space
rather than an empty string--make always preserves all TRAILING whitespace
after a value, so any space between the value and a comment, for example, is
included in the value.

Obviously make should not crash even so, and I've fixed this bug; now you'll
get:

make: *** No targets.  Stop.

I also noticed make wasn't expanding this variable before use, which is
wrong.  Fixed that too.

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