[Bug cli/15145] New: cd and $cwd do not handle symlink/../ correctly

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15145

             Bug #: 15145
           Summary: cd and $cwd do not handle symlink/../ correctly
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: cli
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jan.kratochvil@redhat.com
    Classification: Unclassified


cd_command tries to remove "name/../" from the path.
But that is incorrect if "name" is a symlink.

$ mkdir /tmp/{bar,baz,baz/xxx,baz/bar}
$ ln -s baz/xxx /tmp/foo
$ gdb -q -ex 'cd /tmp/foo/../bar' -ex 'path .' -ex r -ex q --args bash -c 'echo
$PATH'
Working directory /tmp/bar
 (canonically /tmp/baz/bar).
Starting program: /usr/bin/bash -c echo\ \$PATH

Actual:
/tmp/bar:[...]

Expected:
/tmp/foo/../bar
or
/tmp/baz/bar

As /tmp/bar is a directory never referenced by user above.

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