bug#12911: 24.3.50; let users decide where (& perhaps whether) `emacs_backtrace.txt' files are written

[Eli Zaretskii]

> Date: Sat, 17 Nov 2012 21:19:36 -0800
> From: Paul Eggert <eggert@cs.ucla.edu>
> CC: 12908@debbugs.gnu.org
> 
> Gnulib has a dup2 implementation that works on Microsoft Windows,
> so if we use that, it seems we should be able to use the same idea
> there too.

Thanks, but no, thanks.  Gnulib's dup2 implementation uses so many
non-trivial interfaces (exceptions, invalid parameter handlers, etc.)
that I'd prefer not to deal with for a feature that needs to be rock
solid and dependable.

In any case, this is an almost orthogonal issue to what is being
discussed here.  The issue here is not _whether_ to redirect stderr,
but rather _where_to_ to redirect it.