Description of problem:
Recently llvm was updated to 3.5 in F22 rawhide (bug 1111834).
Unfortunately currently ghc's llvm backend does not support llvm 3.5 yet.
(Even latest ghc-7.8.3 which is not yet in rawhide requires 3.1 <= llvm <= 3.4.)
In future (ghc-7.12) upstream is thinking to support officially one
known-to-work llvm version per major release.  On armv7 ghc uses
llvm as its main compiler backend (unlike other arch's).
The bottom line is that llvm-3.5 breaks ghc on arm, one of the primary
Fedora archs so we can build any Haskell packages currently in rawhide!

Version-Release number of selected component (if applicable):
3.5

How reproducible:
100%

Steps to Reproduce:
1. try to build ghc or other haskell packages in Rawhide ARM
or
2.
$ echo "main = putStrLn "hi" > hello.hs
$ ghc hello.hs
$ ./hello

Actual results:
test: schedule: re-entered unsafely.
   Perhaps a 'foreign import unsafe' should be 'safe'?

Expected results:
no runtime error (or no llvm-3.5;)

Additional info:
Workaround seems to be to add a llvm34 package to Fedora
unless there should be some simple packages available to
fix ghc llvm on ARM...  So I filed a review request in bug 1161014.