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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Preventing warnings in FIXNUM_OVERFLOW_P
Date: Fri, 19 Jan 2007 05:42:53 -0500
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Xref: news.gmane.org gmane.emacs.devel:65297
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    Eli's current workaround is still the least bad I've seen.

A GCC developer says that the warning does not happen for unsigned
types.  That means that even if GCC gets smarter, it won't give that
warning if we use an unsigned type.