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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Dumper issue, revisited; invalid realloc/free
Date: Wed, 04 Feb 2015 21:26:27 +0200
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To: Rich Felker <dalias@libc.org>
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> Date: Wed, 4 Feb 2015 14:13:05 -0500
> From: Rich Felker <dalias@libc.org>
> Cc: emacs-devel@gnu.org
> 
> > Yes.  Several platforms (Cygwin and MinGW on MS-Windows) already do
> > exactly that.
> 
> Where is the code that does this? I don't see it in alloc.c.

The Cygwin code is in sheap.c, the MinGW code is in w32heap.c.

> Is it only used when system_malloc=no? The case where it's really
> needed is for system_malloc=yes...

MinGW uses that with system malloc.  Not sure about Cygwin.