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better "pr" with gdb-6.4

From: Dan Nicolaescu
Subject: better "pr" with gdb-6.4
Date: Sun, 05 Feb 2006 10:40:24 -0800

Using "pr" when debugging is a bit inconvenient because one has to do:


Instead it would be nicer to just do:

Well, with gdb-6.4 this is possible, thanks to a new variable ($argc)
that holds the number of arguments passed to a command. "pr" can now
be written like this to support both versions shown above:

define pr
  if ($argc == 0)
     set debug_print ($)
  elif ($argc == 1)
     set debug_print ($arg0)

Processing even more arguments can be done by adding more "elif"
  elif ($argc == 2)
     set debug_print ($arg0)
     set debug_print ($arg1)

Unfortunately AFAIK it is not possible to do it in a simpler way
(there's no equivalent of Bourne shell's "shift" and the positional
arguments cannot be accessed through a variable that can be
incremented in a loop).

I don't know enough about autoconf to integrate the above in the build
system, but maybe some of you might be useful as a local hack until
properly integrated in emacs....


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