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From: Glenn Morris <rgm@gnu.org>
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Subject: CANNOT_DUMP and portable dumper
Date: Tue, 29 Jan 2019 15:49:20 -0500
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CANNOT_DUMP used to mean "Emacs cannot be dumped on your system".
Now it means "Emacs should not support unexec".

This means that current master builds using portable dumper have
CANNOT_DUMP set in system-configuration-features.
I keep being confused by this (in bug reports).

Maybe it makes sense to re-use CANNOT_DUMP from an implementation point
of view, but perhaps it should at least not be listed in
system-configuration-features any more (replaced by eg PORTABLE_DUMP)?

(Or maybe it's just me being confused.)

PS Perhaps etc/DEBUG "Running Emacs built with malloc debugging
packages" is now outdated in this regard?