> Date: Sat, 17 Dec 2016 09:51:15 +0200 > From: Eli Zaretskii <e...@gnu.org> > Cc: bug-gnulib@gnu.org, emacs-de...@gnu.org > > I will try to look into this some more today, and see if I can unlock > the mystery. It bothers me, too.
Bug squashed, see commit 0757b4f. It was always there, we were just lucky until now. What the inclusion of errno.h did is increase the size of the object file (due to massive debug info about macros), and thus the size of temacs, by 1.5KB, and that caused writes to emacs.exe to cross the page boundary beyond the allocated memory mapping, and segfault. You can now remove the workaround from stdio-impl.h. (I already did that in the Emacs repository.) Thanks.
