simple program crashes

simple program crashes

[m.]

I have this simple program:

#include <sstream>
int main(void) {
        int i;
        std::ostringstream buf;
        //buf.width(2);
        buf.fill('0');
        return 0;
}

I compile/link it using: g++ a.cc
and then execute: ./a.out

But the program crashes - 
Bus Error (core dumped)

Using: gcc -v
Reading specs from /usr/local/lib/gcc-lib/sparc-sun-solaris2.9/3.3/specs
Configured with: ../configure --disable-nls --with-as=/usr/ccs/bin/as
--with-ld=/usr/ccs/bin/ld
Thread model: posix
gcc version 3.3


The problem occurs if any variable is declared before ostringstream, if
ostringstream is defined first, the program runs fine.
What could cause this problem?
Thanks..
m.