[Buildroot] [PATCH] system: add comment about busybox-show-others

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, All,

On 2016-05-27 22:50 +0200, Thomas Petazzoni spake thusly:
> On Fri, 27 May 2016 22:34:51 +0200, Yann E. MORIN wrote:
> 
> >  config BR2_INIT_SYSV
> >  	bool "systemV"
> > +	# BR2_PACKAGE_BUSYBOX_SHOW_OTHERS exists even when Busybox is not enabled
> >  	select BR2_PACKAGE_BUSYBOX_SHOW_OTHERS # sysvinit
> 
> Well, I don't really see the point. You can perfectly well have Busybox
> enabled *and* systemV as your init system.

I'm not arguing that.

What was puzzling me is that BR2_PACKAGE_BUSYBOX_SHOW_OTHERS *appears*
to be a Busybox option.

Package options should not be selected before ensurign that the package
itself is enabled, so we have wither:

    select BR2_PACKAGE_FOO
    select BR2_PACKAGE_FOO_OPTION

or:

    depends on BR2_PACKAGE_FOO
    select BR2_PACKAGE_FOO_OPTION

or:

    select BR2_PACKAGE_FOO_OPTION if BR2_PACKAGE_FOO

However, for this specific option, it is *also* available when Busybox
is *not* enabled: it is not a package option.

So it is perfectly legit to select it without checking that Busybix
itself is enabled.

(Yes, I lost almost 10 minutes hunting that down...)

Regards,
Yann E. MORIN.

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