One more data point: My gcc is gcc -v Reading specs from /usr/local/lib/gcc/sparc-sun-solaris2.8/3.4.3/specs Configured with: ../configure --enable-threads=posix --enable-languages=c++ --disable-nls : (reconfigured) ../configure --enable-threads=posix --disable-nls --enable-languages=c++ : (reconfigured) ../configure --enable-threads=posix --disable-nls --enable-languages=c++ Thread model: posix gcc version 3.4.3