mkdir -p problem (cygwin)

[Nigel Berkeley]

I dont know if this bug has been reported or not, but here is the problem:

mkdir -p //c/blah/blahblah

This command fails when I refer to drive C: with the //c/, it just does not
create the dir, and there is no error message to say it failed. But it
should recursively create that dir. It works fine if I do something like
this:

mkdir -p /blah/plah/blah

because then its using the cygwin root.
$ mkdir --version
mkdir (GNU fileutils) 4.0

Thanks,
Nigel