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Date:   Thu, 16 May 2019 18:38:35 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     David Laight <David.Laight@...lab.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sam Ravnborg <sam@...nborg.org>, Arnd Bergmann <arnd@...db.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Jessica Yu <jeyu@...nel.org>,
        Lucas De Marchi <lucas.de.marchi@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Rusty Russell <rusty@...tcorp.com.au>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] kbuild: check uniqueness of basename of modules

Hi David,

On Thu, May 16, 2019 at 6:00 PM David Laight <David.Laight@...lab.com> wrote:
>
> From: Masahiro Yamada
> > Sent: 15 May 2019 18:55
> ...
> > >     xargs basename -a -- | sort | ...
> >
> > Sorry for my ignorance, but could you
> > teach me the effect of "--" ?
> >
> > I sometimes use "--" as a separator
> > when there is ambiguity in arguments
> > for example, "git log <revision> -- <path>"
> >
> > In this case, what is intended by "--"?
>
> The '--' stops getopt() from parsing any more parameters.
> Useful things like 'grep -- -q' which will search for the
> string '-q' rather than treating it as a command line option.
>
> This is all made more horrid by a decision by the writers
> of glibc getopt() to 'permute' argv[] so that 'options'
> can follow 'nonoptions' ie it converts:
>         prog file -arg
> to
>         prog -arg file
> The only program the historically allowed 'late' options
> was 'rlogin hostname -l username'.
> This is just broken.....


Ah, I see.  This does not happen for
modules.order or modules.builtin,
but I will use '--' just in case.

Thanks.


>         David
>
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
> Registration No: 1397386 (Wales)



-- 
Best Regards
Masahiro Yamada

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