bug#13759: 24.3.50; bootstrap failed; bootstrap-emacs segfaults

[Katsumi Yamaoka <yamaoka@jpl.org>]

In GNU Emacs 24.3.50.1 (i686-pc-cygwin, X toolkit, Xaw3d scroll bars)
 of 2013-02-15 on localhost
(Bzr revision: 111784 jan.h.d@swipnet.se-20130214190112-35htkvic2zp1bwr2)
Windowing system distributor `The Cygwin/X Project', version 11.0.11302000
Configured using:
 `configure --verbose --with-x-toolkit=lucid --without-imagemagick
 --without-dbus --without-gconf --without-gsettings'

Can't build Emacs trunk on Cygwin (daily updated) on Windows 7:
[...]
Static heap usage: 9541024 of 13631488 bytes
43466 pure bytes used
cd ../lisp; make -w compile-first EMACS=/Work/emacs/src/bootstrap-emacs.exe
make[3]: Entering directory `/Work/emacs/lisp'
Compiling /Work/emacs/lisp/emacs-lisp/macroexp.el
Fatal error 11: Segmentation faultMakefile:243:\
 recipe for target `/Work/emacs/lisp/emacs-lisp/macroexp.elc' failed

Here's a backtrace:

% gdb src/bootstrap-emacs.exe
GNU gdb (GDB) 7.5.50.20120815-cvs (cygwin-special)
[...]
Reading symbols from /Work/emacs/src/bootstrap-emacs.exe...done.
(gdb) r
Starting program: /Work/emacs/src/bootstrap-emacs.exe
[New Thread 9364.0x1a3c]
[New Thread 9364.0x1d18]

Program received signal SIGSEGV, Segmentation fault.
mmap_alloc (var=0xf26d18, nbytes=15273) at buffer.c:4906
4906            r->next->prev = r;
(gdb) bt
#0  mmap_alloc (var=0xf26d18, nbytes=15273) at buffer.c:4906
#1  0x004d07b9 in mmap_realloc (nbytes=15273, var=0xf26d18) at buffer.c:4945
#2  enlarge_buffer_text (b=0xf26c00, delta=0) at buffer.c:5053
#3  0x004d1e16 in init_buffer () at buffer.c:5301
#4  0x004af6dd in main (argc=1, argv=0x22ac40) at emacs.c:1305
(gdb) 

Is any other information required?  Thanks.