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From: "karl at freefriends dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug driver/48306] New: presence of gcc subdir with . in PATH causes breakdown
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48306

           Summary: presence of gcc subdir with . in PATH causes breakdown
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: karl@freefriends.org


If a directory in PATH contains a subdirectory gcc/ (with executable access),
gcc fails to find its subprograms:

$ PATH=/tmp:$PATH
$ mkdir /tmp/gcc
$ gcc hello.c
gcc: error trying to exec 'cc1': execvp: No such file or directory
$ rmdir /tmp/gcc
$ gcc hello.c
$

If this behavior is explained or implicit in the documentation, sorry; I
couldn't find it.  It happens in at least gcc 4.5.x and 4.6.0.  I'm sure it
wasn't always this way.