libstdc++/7213: g++ 3.1: basic_filebuf doesn`t support open mode "a+"

[paolo@gcc.gnu.org]

Synopsis: g++ 3.1: basic_filebuf doesn`t support open mode "a+"

Responsible-Changed-From-To: unassigned->paolo
Responsible-Changed-By: paolo
Responsible-Changed-When: Fri Jul  5 04:51:33 2002
Responsible-Changed-Why:
    Triaged.
State-Changed-From-To: open->closed
State-Changed-By: paolo
State-Changed-When: Fri Jul  5 04:51:33 2002
State-Changed-Why:
    Not a bug: open mode in|out|app is *not* allowed, see
    27.8.1.3, Table92 of the ISO standard, or, f.i., Josuttis,
    p.632 for details.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7213