[bug #64746] Exponential Runtime in make 4.4.1 when export is used

[Paul D. Smith]

Follow-up Comment #3, bug #64746 (project make):

Many have asked for a new "optional simple assignment" variant.  I'm not
opposed to it.

Another option that will work with most currently available versions of GNU
make, although it looks somewhat scary, is described here:

https://make.mad-scientist.net/deferred-simple-variable-expansion/

I haven't actually tested it to make sure it fixes this specific problem but
based on my understanding of the issue it should.


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