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[bug #63040] autoconf-2.69 and 2.71 fail to build after $(shell ...) env

From: Paul D. Smith
Subject: [bug #63040] autoconf-2.69 and 2.71 fail to build after $(shell ...) environment handlign change
Date: Fri, 9 Sep 2022 10:02:02 -0400 (EDT)

Follow-up Comment #2, bug #63040 (project make):

Argh.  This export-to-shell-function change is the gift that keeps on giving.

I guess the best thing to do is, rather than expanding a recursive variable to
the empty string, we expand it to its contents without trying to further
expand it to avoid the recursion.

That could be weird.  Definitely need to think carefully about this, probably
after I have my tea.


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