Re: Building the 7.8.90 pretest on MinGW

[Eli Zaretskii <eliz@gnu.org>]

> Date: Thu, 22 Jan 2015 17:03:30 +0000
> From: Pedro Alves <palves@redhat.com>
> CC: dje@google.com, gdb-patches@sourceware.org
> 
> No, I mean, start a shell buffer in emacs, start gdb within that,
> and do "layout src".
> 
> See https://sourceware.org/bugzilla/show_bug.cgi?id=17519.
> 
> Could you try that?

It says "TUI mode not allowed".  (Tested in GDB 7.8.1 built with TUI,
I don't have a newer binary where I type this.)

> > Why would it? pipes fail the isatty test.
> 
> Right.  I recalled that Windows isatty returns true on all
> sorts of character devices, like serial ports or the NUL device,
> not just consoles, but confused pipes.  Pipes are not one of
> those.  I see that gnulib has a isatty module that checks that
> exactly -- it uses GetConsoleMode to make sure input is a real
> console handle.  We don't import that gnulib module presently, but
> if we need that console check it sounds like importing that
> module would be way to fix it.

Fix what?  TUI doesn't need this fix.  The only practical problem with
MS runtime's isatty is that the null device doesn't fail it, but
that's of a marginal importance for GDB, I think.  That issue is
important for filters and other batch-style programs where redirection
to or from the null device is frequently used.