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
