gcc 4.1.1 -M bug?

[John Love-Jensen]

Hi Hiroki,

Very cool!  You've found a bug!  Please file your bug here:
http://gcc.gnu.org/ (under the [Bugs] section).

Most people who say they've found a bug actually didn't find a bug, but
rather misunderstood something.  But you found a legitimate bug!  I'm
envious.  :-)

Until fixed, the workaround is: don't specify double-slash as part of the
include path specifier.

Sincerely,
--Eljay