bug#7450: cp does not check for errno=EISDIR when target is dangling link

[Paul Eggert]

On 11/22/10 08:33, Eric Blake wrote:
> The strongest arguments for changing the kernel would be bringing it
> into compliance with POSIX.

You're right that the Linux kernel doesn't conform to POSIX here
(and thank you for correcting me).  However, in the past, I found that
"this errno value does not conform to POSIX" doesn't carry much
weight with the kernel developers.  I expect that a much stronger
argument is "this errno value causes confusion", which it certainly
did here.  Failure to conform to POSIX is icing on the cake.