https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61955
--- Comment #3 from Bruce Adams <tortoise_74 at yahoo dot co.uk> --- Running configure using --disable-libcilkrts (in addition to --disable-libsanitiser) which is not documented results in a useable gcc 4.9.1 (with c++ working but presumably cilk++ broken).
