libstdc++/6442: Regression wrt 3.0.x: undefined reference to `std::__basic_file<char>::is_open()'

[paolo@gcc.gnu.org]

Synopsis: Regression wrt 3.0.x: undefined reference to `std::__basic_file<char>::is_open()'

State-Changed-From-To: open->analyzed
State-Changed-By: paolo
State-Changed-When: Wed Apr 24 14:18:04 2002
State-Changed-Why:
    I cannot reproduce this with 3.1 20020424 on x86-linux:
    paolo:~> g++ -v
    Reading specs from /usr/local/gcc-test/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs
    Configured with: ../gcc-3_1-branch/gcc/configure --prefix=/usr/local/gcc-test
    Thread model: single
    gcc version 3.1 20020424 (prerelease)
    paolo:~> cat bug.cc
    #include <iostream>
    #include <sstream>
    
    using namespace std;
    
    int main() {
      string s;
      ostringstream d(s);
      d << "hello" << endl;
      cout << d.str();
    }
    paolo:~> g++ bug.cc
    paolo:~>

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