[Bug gdb/20604] Using quit() causes a infinity loop which and can not exit gdb

["tromey at sourceware dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20604

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-09-14
                 CC|                            |tromey at sourceware dot org
     Ever confirmed|0                           |1

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
This is a funny one.  My first thought was that it couldn't be possible,
but sure enough... the bug is that quit_command just passes its argument
to quit_force, which does the evaluation after messing with the
terminal settings.

I have a patch that changes this area a bit, in particular it does
the expression evaluation in quit_command and no longer passes the
expression to kill_or_detach (which is undocumented behavior and also,
I think, incorrect).

I'll send it to gdb-patches when I find the time to regression test.

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