segfaults in programs compiled with g++

In my earlier mail, I had mysqld segfaulting. On looking
further I see
many other programs like nmap, webmin are giving errors.
While
rebuilding the system with
emerge -e system
I got an error message from groff complaining of non-working
C++
compiler.
Thus, I tried compiling a simple C++ program from a friend,
it compiles
fine but I get segfault on it, too, while running.
I am attaching groff error and g++ -v