Hi, The gcc-bugs mailing list is for automated emails from our Bugzilla database. Your question is not about a bug, so would be more appropriate on the gcc-help mailing list.
The answer to your question is that GCC itself is now built using a C++ compiler, so it needs to build the C++ compiler to build itself, see http://gcc.gnu.org/install/configure.html --enable-build-poststage1-with-cxx When bootstrapping, build stages 2 and 3 of GCC using a C++ compiler rather than a C compiler. Stage 1 is still built with a C compiler. This is enabled by default and may be disabled using --disable-build-poststage1-with-cxx.
