libstdc++/3647: in_avail() is not working according to the ISO standard

[pme@gcc.gnu.org]

Synopsis: in_avail() is not working according to the ISO standard

Responsible-Changed-From-To: unassigned->pme
Responsible-Changed-By: pme
Responsible-Changed-When: Wed Jul 11 13:06:10 2001
Responsible-Changed-Why:
    Because.
State-Changed-From-To: open->analyzed
State-Changed-By: pme
State-Changed-When: Wed Jul 11 13:06:10 2001
State-Changed-Why:
    Confirmed as a bug; std::basic_filebuf::showmanyc() is
    calling underflow().

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=3647&database=gcc