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Date: Sun, 24 Aug 2014 18:27:14 +0300
From: Eli Zaretskii <eliz AT gnu DOT org>
Subject: Re: Emacs pretest 24.3.93
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> Date: Sun, 24 Aug 2014 18:06:11 +0300
> From: Eli Zaretskii <eliz AT gnu DOT org>
> 
> >     - If the sources are configured without --no-debug and -O0 flag then the
> >       build process aborts with the following error message:
> > 
> > gcc -Demacs  -I. -I../lib           -O0 -gcoff    \
> >    -o temacs  vm-limit.o dispnew.o frame.o scroll.o xdisp.o menu.o xmenu.o window.o charset.o coding.o category.o ccl.o character.o chartab.o bidi.o cm.o term.o terminal.o xfaces.o    emacs.o keyboard.o macros.o keymap.o sysdep.o buffer.o filelock.o insdel.o marker.o minibuf.o fileio.o dired.o cmds.o casetab.o casefiddle.o indent.o search.o regex.o undo.o alloc.o data.o doc.o editfns.o callint.o eval.o floatfns.o fns.o font.o print.o lread.o syntax.o unexcoff.o bytecode.o process.o gnutls.o callproc.o region-cache.o sound.o atimer.o doprnt.o intervals.o textprop.o composite.o xml.o profiler.o decompress.o dosfns.o msdos.o w16select.o termcap.o tparam.o lastfile.o gmalloc.o ralloc.o ../lib/libgnu.a                                     -lm
> > sysdep.o: In function `emacs_backtrace':
> > sysdep.c:2115: undefined reference to `backtrace'
> > sysdep.c:2121: undefined reference to `backtrace_symbols_fd'
> 
> These functions are in lib/execinfo.h, but I see that lib/execinfo.c
> is not compiled in the DJGPP build.  That's a real bug, I will fix it
> soon.

Please try the patch below.  After applying it, re-run "config msdos"
before running "make install".  I hope this will now work both with
and without -O0 in CFLAGS.