Re: Failures in build Emacs-CVS on Cygwin

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 24 Nov 2006 00:55:10 +0100 (MET)
> From: Angelo Graziosi <Angelo.Graziosi@roma1.infn.it>
> cc: emacs-devel@gnu.org, jbuehler@spirentcom.com
> 
> Configuring the CYGWIN env. variable, when bootstrapping, it creates
> lisp/bootstrap-emacs.exe.core, so I have tried the following (I am not a
> very expert of GDB)
> 
> Using 'run' under GDB, it hangs and I must kill it:
> ---------------------------------------------------------------
> $ gdb ./bootstrap-emacs.exe ../lisp/bootstrap-emacs.exe.core 
> GNU gdb 6.5.50.20060706-cvs (cygwin-special)
> Copyright (C) 2006 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you
> are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for
> details.
> This GDB was configured as "i686-pc-cygwin"...
> 
> warning: core file may not match specified executable file.
> 
> warning: Couldn't find general-purpose registers in core file.
> 
> warning: Couldn't find general-purpose registers in core file.

These 3 messages aren't a good sign.

> #0  0x00000000 in ?? ()
> DISPLAY = :0.0
> TERM = xterm
> Breakpoint 1 at 0x200a0b66: file
> /home/Angelo/Downloads/cygwin_varie/emacs-cvs/emacs/src/emacs.c, line 464.
> Breakpoint 2 at 0x200ba689: file
> /home/Angelo/Downloads/cygwin_varie/emacs-cvs/emacs/src/sysdep.c, line
> 1385.
> (gdb) run

No, you shouldn't run the program.  You are debugging a core file,
which is an image of a dead program.  Such a program cannot be run.
You can only examine the variables and memory.  So the right command
is "bt".