[Bug bootstrap/58289] gcc/gengtype.c includes gcc/double-int.h, which uses C++ constructs

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58289

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to James K. Lowden from comment #2)
> 1.  This is not mentioned anywhere in
> http://gcc.gnu.org/install/configure.html. 

http://gcc.gnu.org/install/prerequisites.html