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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: Re: gud-mode --annotate=3 and synchronization problems
Date: Sat, 01 Sep 2007 00:06:56 -0400
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To: Nick Roberts <nickrob@snap.net.nz>
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     > Typing commands before gdb is ready makes gud-mode confused.
     > Also note the command being repeated on quit using Ctrl-D (^D).

    I think this and your earlier bug report are consequences of the way input for
    GDB is queued using annotations.

Can you program the Lisp code to discard user input, and not send it
to GDB, until GDBs's output shows it is ready?