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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Building Emacs overflowed pure space
Date: Wed, 19 Jul 2006 22:21:55 -0400
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Symbols are not copied to pure space at all.
This is because their slots are not constant.
However, make_symbol copies uninterned symbol names to pure space.
Since the existing dolist macro generates a new symbol each time,
these symbols share nothing in the compiled output; they are different
uninterned symbols whose names happen to be the same.  So lread.c
copies the name to pure space each time.