bug#8391: chmod setuid & setguid bits

[Paul Eggert]

On 03/05/2012 08:42 AM, Bruno Haible wrote:
> This use of '@' in a mode string conflicts with the use of '@' on
> MacOS X 10.5 and newer to designate "extended attributes" (like
> quarantine information on MacOS X 10.7).

I don't see why.  That's an *output* format, whereas we're
talking about an *input* format.  In many systems, for example,
"+" is used to designated extended attributes in "ls" mode output,
but this use of "+" does not conflict with input usages like
"chmod +x foo".