http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54791
--- Comment #24 from David Edelsohn <dje at gcc dot gnu.org> 2012-11-14 14:20:06 UTC --- I successfully built GCC 4.7 earlier this week. You may need to use GMP 4.3.2, not GMP 5.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54791
--- Comment #24 from David Edelsohn <dje at gcc dot gnu.org> 2012-11-14 14:20:06 UTC --- I successfully built GCC 4.7 earlier this week. You may need to use GMP 4.3.2, not GMP 5.0