ghc-7.10 branch regression

[Ben Gamari]

Erik de Castro Lopo <mle+hs at mega-nerd.com> writes:

> Reid Barton wrote:
>
>> Why do we need to revert anything, can't we just make a one-character fix
>> of 3.6 to 3.5 on the ghc-7.10 branch?
>
> Even with that one character change the LLVM detection is not complete
> or correct. Specifically, building the compiler will enforce the right
> llvm version, but the binary-dist configure script just uses "llc" and
> "opt".
>
> Furthermore, I am pretty sure that #10292 is causes by llvm-3.5 and that
> if we use llvm-3.6 buildng on Arm works. Unfortunately building and
> testing on Arm takes a long time and I am still in the process of
> verifying this.
>
While I would love to see LLVM 3.6 rolled out soon as a GHC target (it
is substantially more stable on ARM in my experience) I agree that doing
this for 7.10.2 would be a bit of a large change for a minor release.
If nothing else it would be surprising for users to find that their
previously working LLVM/GHC combination needed to be upgraded upon
moving to 7.10.2.

In my experience LLVM 3.5 works reasonably well on ARM; it seems like
this should be sufficient to carry us through to 7.12.

Cheers,

- Ben
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