https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87496
--- Comment #3 from Michael Meissner <meissner at gcc dot gnu.org> --- We should not allow -mabi=ieeelongdouble if we do not have the full ISA 2.06 (power7) instruction set (i.e. both -mpopcntd and -mvsx should be set). It was probably an oversight that I only checked for -mvsx.
