Hi Jarl,

I think I just ran into this too for Fedora 22 rawhide on ARM and found your posts...

On 30 October 2014 16:11, Jarl Gunnar Flaten <jarl.flaten@gmail.com> wrote:

I am trying to compile a simple "hello world" program (test.hs). When compiling I am notified:
> [1 of 1] Compiling Main             ( test.hs, test.o )
> You are using a new version of LLVM that hasn't been tested yet! 
> test: schedule: re-entered unsafely.
>    Perhaps a 'foreign import unsafe' should be 'safe'?
Isn't working. I'm not familiar enough with neither LLVM nor Haskell to troubleshoot from either of these; I don't even know if the messages are even related.
They are related in the sense that llvm-3.5 seems to this problem and it is not officially supported by ghc-7.6 or ghc-7.8 (hence the warning).
ghc-7.8 supports 3.4 and 7.6 seems to mostly work with some patches.

Can you provide more details on your environment: OS and ghc version etc?

I am not sure yet what is causing this: perhaps you could try compiling with "-threaded" and see if that helps?

Jens