https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106312
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- Ah, I have quite old versions of the prerequisite libs: lrwxrwxrwx. 1 jwakely jwakely 12 Feb 17 2017 gmp -> ./gmp-6.1.0/ lrwxrwxrwx. 1 jwakely jwakely 12 Feb 17 2017 mpc -> ./mpc-1.0.3/ lrwxrwxrwx. 1 jwakely jwakely 13 Feb 17 2017 mpfr -> ./mpfr-3.1.4/ I've removed those symlinks and run contrib/download_prerequisites again and am rebuilding now. If this fixes it, we might need to document that mpfr 3.1.0 is no longer sufficient for GCC: https://gcc.gnu.org/install/prerequisites.html
