can't move to latest version of llvm on ghc 9.12.2

[George Colpitts]

Filed https://gitlab.haskell.org/ghc/ghc/-/issues/25915

On Tue, Apr 1, 2025 at 2:11 PM Andreas Klebinger via ghc-devs <
ghc-devs at haskell.org> wrote:

> Looking at https://gitlab.haskell.org/ghc/ghc/-/issues/25011 it seems the
> desire was to fail with a proper error when LLVM was not found at all.
>
> To me failing when the llvm version is too new seems like a unintended
> side effect of fixing the former.
>
> I agree that simply warning and trying anway is the better default. A
> ticket would be appreciated!
> Am 01/04/2025 um 19:05 schrieb George Colpitts:
>
> I was trying to find out if it works but I ran into the problem I
> described. Yes, there were a few years where the latest version didn't work
> but in many years it did. ghc used to give a warning, this is an
> unsupported version but we'll try it anyways. I would like to return to
> that.
>
> In any case I believe ghc dev should test to see if it works and if so use
> it in HEAD. If it doesn't work than we should file a bug and fix it. In the
> past we got a few versions behind llvm. I think we want to be on the latest
> version available for each new release if possible. The earlier we look
> into this the more chance we have to succeed at that.
>
> On Tue, Apr 1, 2025 at 1:27 PM Brandon Allbery <allbery.b at gmail.com>
> wrote:
>
>> Have you demonstrated that it works? IIRC the current behavior is because
>> some LLVM version (16, IIRC) didn't work with GHC (threw errors from opt, I
>> think).
>>
>> On Tue, Apr 1, 2025 at 10:49 AM George Colpitts <
>> george.colpitts at gmail.com> wrote:
>>
>>> llvm 20 is out but unlike in earlier versions of ghc moving to it means
>>> you can no longer use llvm:
>>>
>>> compiling:
>>>
>>> ghc -fllvm hello.hs
>>> Loaded package environment from
>>> /Users/avie/.ghc/aarch64-darwin-9.12.2/environments/default
>>> [1 of 2] Compiling Main             ( hello.hs, hello.o )
>>> <no location info>: error: [GHC-66599]
>>>     GHC was not configured with a supported LLVM toolchain
>>>     Make sure you have installed LLVM between [13 and 20) and reinstall
>>> GHC to make -fllvm work
>>>
>>>
>>> from configure:
>>>
>>> configure: We only support llvm 13 upto 20 (non-inclusive) (found
>>> 20.1.1).
>>>
>>>
>>> Can we move to llvm 20 on HEAD and can we revert to the old behavior on
>>> ghc 9.12.3?
>>>
>>> Should I file an ER?
>>>
>>> Thanks
>>>
>>> _______________________________________________
>>> ghc-devs mailing list
>>> ghc-devs at haskell.org
>>> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
>>>
>>
>>
>> --
>> brandon s allbery kf8nh
>> allbery.b at gmail.com
>>
>
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