Possible bug in libstdc++ v3

[Vitaly A. Repin]

Hello, All!

The following example is very simple.  There are 2 files -- header and
source.

Header file (tst.h):

#ifndef TST_H
#define TST_H

#include <string>
#include <stdexcept>

using std::string;

class bad_cfg : public std::runtime_error {
public:
        bad_cfg(const string& reason, const int err_num=0) throw();
private:
        const int errno;
};
#endif //TST_H

Source file (tst.cc):
#include "tst.h"
#include <iostream>

bad_cfg::bad_cfg(const string& reason, const int err_num=0) throw()
        : std::runtime_error(reason), errno(err_num) {};

Compilation command:
g++ -O2   -c tst.cc -o tst.o

(Last gcc version (3.0) and libstdc++ from its distribution)

Error:
tst.cc: In constructor `bad_cfg::bad_cfg(const std::string&, int)':
tst.cc:5: anachronistic old style base class initializer
tst.cc:5: base class `std::runtime_error' already initialized
tst.cc:5: parse error before `err_num'

! But the following compilation command is successfull:
g++ -O2  -I/usr/local/include/stlport/     -c tst.cc -o tst.o

(Last gcc version (3.0) and stdlib from STLport-4.5b8 www.stlport.org)

! And if I remove "#include <iostream>" from source file then all ok in 
both cases.

It seems to me, it can be the bug in libstdc++ impementation 
distributed with last g++ release.
Am I right?

Pls, send your replies not only in the mailing list but to 
my e-mail too.  Unfortunately, I haven't subscribed to this mailing list.

Thank you.

Good-bye! 
-- 
WBR & WBW, Vitaly.