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Date:   Thu, 16 May 2019 09:00:50 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Masahiro Yamada' <yamada.masahiro@...ionext.com>,
        Kees Cook <keescook@...omium.org>
CC:     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

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.....

	David

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