Including libffi as a submodule

[Ben Gamari]

John Wiegley <johnw at newartisans.com> writes:

>>>>>> "BG" == Ben Gamari <ben at smart-cactus.org> writes:
>
> BG> Note that under this scheme it will still be possible to link against the
> BG> system's libffi installation using ./configure's --enable-system-libffi
> BG> flag.
>
> Will distributions of GHC be using a system libffi which still has the bugs
> you mentioned?
>
My inclination would be to use the system libffi unless this option is
precluded due to bugs. By this standard I believe the only GHC HQ binary
distributions which would include an unreleased libffi would those for
ARM and AArch64.

Cheers,

- Ben
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