> Date: Fri, 3 Nov 2017 23:47:32 -0700
> From: Chris Hanson <c...@chris-hanson.org>
> 
> Test failures due to unimplemented primitives, and places where values were
> returned rather than traps thrown or vice versa.

I see -- the problem is probably that we supply a definition of
feenableexcept/fedisableexcept only if !HAVE_FENV_H, and since Apple
presumably does provide the standard <fenv.h>, we just use that but
without feenableexcept/fedisableexcept.

Maybe we should split off the feenableexcept/fedisableexcept fallback
logic into a separate cmpintmd/x86-fexcept.c or flotrap or something.

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