Re: [Qemu-devel] [RFC PATCH] vl.c: add -semihosting-config "arg" sub-argument

[Leon Alrae <leon.alrae@imgtec.com>]

On 16/04/2015 15:22, Peter Maydell wrote:
> On 15 April 2015 at 10:09, Liviu Ionescu <ilg@livius.net> wrote:
>> we currently have two solutions:
>>
>> - multiple: --semihosting-config arg="..."
>> - a single option, placed at the end, and followed by any number
>>   of arguments: --semihosting-cmdline $@ \n
>>
>> both can generate the array of args required by UHI and both can pass
>> args with spaces.
> 
> I strongly dislike the second of these options -- it is nothing like
> the way QEMU's system-emulator mode handles other command line
> arguments. (The user-mode executable is not a good model to try
> to copy, because (a) its sole purpose is executing other binaries
> and passing them command line options (b) it doesn't have the
> QemuOptions infrastructure.)
> 
> I think the first syntax is fine. If you happen to be on ARM where
> there's only a single 'semihosting arguments' string in the ABI
> then you can just say --semihosting-config arg="foo bar baz".
> This has the comma-escaping ugliness, of course, but if you're
> providing a GUI for users anyway it's trivial for the GUI to
> comma-escape things.

The patch which started this thread is the way to go then.

I'll resend the patch with dropped "RFC" as I would really like to go
forward and finally close this issue.

Thanks,
Leon

(PS: --semihosting-cmdline $@ is probably the most convenient from GUI /
wrapper point of view, but I don't have an opinion whether this is
enough to justify adding a top level QEMU command line option with such
a unique syntax)