Debuggee cmd-line arguments bug
Daniel Jacobowitz
drow@false.org
Mon Jul 25 14:24:00 GMT 2005
On Mon, Jul 25, 2005 at 05:59:31PM +0400, Konstantin Karganov wrote:
> Hello.
>
> Playing with the program startup arguments I've found the following
> "feature" of gdb. I have a program that prints its argc/argv parameters.
>
> (gdb) set args a b c d
> (gdb) run
> Starting program: /home/kostik/Work/a.out a b c d
> Argc=5, Argv=/home/kostik/Work/a.out,a,b,c,d
>
> Program exited normally.
> (gdb) set args a b c d
> (gdb) run >out
> Starting program: /home/kostik/Work/a.out >out
>
> Program exited normally.
> (gdb)
>
> In file out there are the folowing:
>
> Argc=1, Argv=/home/kostik/Work/a.out
>
> So when trying to redirect debuggee IO we've lost all cmd-line parameters.
> The same of cource happens with MI (and breaks the debugging startup for
> MPI program!).
>
> Is it a bug?
No. If you provide any options on the "run" command line, you are
replacing the arguments set by set args. I think the text in section
4.3, "Your program's arguments", is pretty clear; please let us know if
it isn't.
> And what is about my previous posts (still unanswered) on:
Please don't reply to list messages to post to the list, by the way.
It messes up threading; you can see the problem in the list archives.
> - running out of source code (stepping past main)
> http://sources.redhat.com/ml/gdb/2005-07/msg00152.html
Your assumption that with step-mode set the PC will always be in user
code is incorrect. For instance, you could be stopped by a signal, or
by a user interrupt, or by a breakpoint in a function without source
code available.
> - incorrect breakpoint diagnostics in MI
> http://sources.redhat.com/ml/gdb/2005-07/msg00175.html
If someone knew the answer, they would have responded. Sorry, that
just happens sometimes.
> - vanishing stopping reason in MI
> http://sources.redhat.com/ml/gdb/2005-07/msg00173.html
>
> "And there's no doing anything about it" ?
You _got_ an answer. Bob agreed that there ought to be a reason.
--
Daniel Jacobowitz
CodeSourcery, LLC
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