bug#12908: 24.3.50; file `emacs_backtrace.txt'?

[Drew Adams]

> > And I'm thinking that the default location should perhaps 
> > be somewhere under .emacs.d, perhaps with the dir that is
> > currently used as the default recorded somehow.
> 
> This is dangerous, because accessing the home directory may involve
> Lisp evaluation, e.g. if that directory is remote.  This facility must
> be as simple and close to the bare metal as possible, or else it will
> be more trouble than help.

Then put it under the Emacs installation directory.

The point is to get it away from user files.  Please use your imagination.  If
there are good reasons why you cannot easily put it here or there, then try
somewhere else - but aim for somewhere that does not interfere with user data.

A users looking in her folder of recipes should not find an Emacs debugging
file.  That should be a no-brainer, at least in terms of goal.