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Date: Fri, 28 Jan 2011 09:58:00 -0000
From: Jan Kratochvil <jan.kratochvil@redhat.com>
To: Hui Zhu <teawater@gmail.com>
Cc: gdb-patches ml <gdb-patches@sourceware.org>
Subject: Re: [PATCH/RFC] Move the cmdarg before load execarg
Message-ID: <20110128095213.GA18993@host1.dyn.jankratochvil.net>
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On Fri, 28 Jan 2011 07:41:22 +0100, Hui Zhu wrote:
> I got following trouble:
> gdb -q -ex "set gnutarget elf32-littlearm" ./vmlinux
> "/home/teawater/kernel/barm_versatile_926ejs/vmlinux": not in executable format: File format is ambiguous.
> Matching formats: elf32-littlearm elf32-littlearm-symbian elf32-littlearm-vxworks.
> Use "set gnutarget format-name" to specify the format.
> 
> Even if I use -ex to exec the command to set the gnutarget, but it is
> useless because cmdarg is exec after the vmlinux load.
> 
> I think -ex should have more high level than others.  So I make a
> patch let it exec before load execarg.
> What do you think about it?

It apparently breaks the much more common case of:
	gdb program -ex 'b main'

You should just use:
	gdb -q -ex "set gnutarget elf32-littlearm" -ex "file ./vmlinux"

as changing options required before the image load is generally an advanced
topic so I guess the "file" command requirement is OK in such case.


Thanks,
Jan