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Bug 1161049

Summary: llvm-3.5 breaks ghc on ARMv7
Product: [Fedora] Fedora Reporter: Jens Petersen <petersen>
Component: ghcAssignee: Jens Petersen <petersen>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: 21CC: agrover, ajax, bos, dan, dmalcolm, haskell-devel, jv+fedora, petersen, scottt.tw
Target Milestone: ---Keywords: Reopened
Target Release: ---   
Hardware: armv7hl   
OS: Unspecified   
Whiteboard:
Fixed In Version: ghc-7.6.3-26.3.fc21 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-01-14 23:55:31 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 245418    

Description Jens Petersen 2014-11-06 09:44:39 UTC 
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.
Comment 1 Jens Petersen 2014-11-06 09:46:41 UTC 
s/test:/hello:/
Comment 2 Jens Petersen 2014-11-18 10:27:00 UTC 
I have worked around the issue in ghc with the new llvm34 package
which is now in f22 Rawhide and seems to be working okay so far.

So probably we could close this CANTFIX say: I don't think we will see
ghc working with llvm-3.5 any time soon.
Comment 3 Jens Petersen 2014-12-25 06:04:04 UTC 
(Actually let me move this to ghc, where we are actually fixing this in fedora.)
Comment 4 Fedora Update System 2014-12-25 08:30:22 UTC 
ghc-7.6.3-26.3.fc21 has been submitted as an update for Fedora 21.
https://admin.fedoraproject.org/updates/ghc-7.6.3-26.3.fc21
Comment 5 Fedora Update System 2014-12-27 09:23:29 UTC 
Package ghc-7.6.3-26.3.fc21:
* should fix your issue,
* was pushed to the Fedora 21 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing ghc-7.6.3-26.3.fc21'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2014-17631/ghc-7.6.3-26.3.fc21
then log in and leave karma (feedback).
Comment 6 Fedora Update System 2015-01-14 23:55:31 UTC 
ghc-7.6.3-26.3.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.