--enable-build-with-cxx and gcc 4.7

[Jack Howarth]

   There was some discussion earlier of defaulting FSF gcc to 
--enable-build-with-cxx
for the stage2 compiler (with the stage 1 bootstrap retaining the use of the 
system c compiler).
Is this change planned for gcc 4.7? On x86_64-apple-darwin10, I have had few 
problems
routinely bootstrapping x86_64-apple-darwin10 with --enable-build-with-cxx.
              Jack