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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: GC bug investigation
Date: Sun, 23 Mar 2014 18:20:25 +0200
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> Date: Sun, 23 Mar 2014 10:57:34 -0400
> From: Richard Stallman <rms@gnu.org>
> Cc: emacs-devel@gnu.org
> 
>     Can you try running with -DGC_CHECK_MARKED_OBJECTS=1 in your CFLAGS?
> 
> I can, but it would be a big pain.  It takes many hours to recompile
> Emacs on this machine.

This macro affects only alloc.c, so you need only recompile that one
file to get the effect.