Bug 839473

Summary: llvm-3.1 missing ghc ARM support: causing all compiled programs to segfault
Product: [Fedora] Fedora Reporter: Jens Petersen <petersen>
Component: llvmAssignee: Michel Lind <michel>
Status: CLOSED RAWHIDE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: unspecified    
Version: rawhideCC: bos, dmalcolm, haskell-devel, michel, pbrobinson
Target Milestone: ---   
Target Release: ---   
Hardware: arm   
OS: Unspecified   
Whiteboard:
Fixed In Version: llvm-3.1-7.fc18 Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2012-07-14 17:33:28 UTC Type: Bug
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
regenerated ocaml patch none

Description Jens Petersen 2012-07-12 04:53:12 UTC 
Description of problem:
Apparently somehow llvm-3.1 is missing the ghc ARM support
that was merged into llvm-3.0.  Presumably an upstream mistake.
Anyway I think we need to patch llvm-3.1 for ARM if we want
have functioning ghc in F18 ARM.  Currently Haskell programs linked
with llvm-3.1 segfault very early on.

How reproducible:
100%

Steps to Reproduce:
1. try to build any ghc-* package with f18 arm
2. minimal testcase:
$ cat > hello.hs
main = putStrLn "hello"
$ ghc --make hello.hs
$ ./hello
  
Actual results:
Segfault!

Expected results:
no segfaults

Additional info:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-June/051119.html
Comment 1 Jens Petersen 2012-07-12 05:09:37 UTC 
Just to confirm: reverting to llvm-3.0-13.fc18 fixes the ARM segfaults.
Comment 2 Jens Petersen 2012-07-12 06:19:25 UTC 
According to the mail the original llvm-3.0 patch should work also for 3.1:

http://lists.cs.uiuc.edu/pipermail/llvmdev/attachments/20111014/844ce355/attachment.pl
Comment 3 Peter Robinson 2012-07-12 09:14:08 UTC 
Referenced patch didn't apply cleanly on ARM. There was another one attached to the original email post that was much closer.

http://lists.cs.uiuc.edu/pipermail/llvmdev/attachments/20120624/891b3ca2/attachment-0001.pl

It needed one section manually applied so the attched patch I think is good.

The following is a scratch build if someone could test that is fixes the problem I'll push the change I have in my local git and build it properly.

http://arm.koji.fedoraproject.org/koji/taskinfo?taskID=959544
Comment 4 Peter Robinson 2012-07-12 09:14:59 UTC 
Created attachment 597745 [details]
regenerated ocaml patch
Comment 5 Peter Robinson 2012-07-12 09:37:48 UTC 
This is the build 

http://arm.koji.fedoraproject.org/koji/taskinfo?taskID=959567
Comment 6 Jens Petersen 2012-07-12 09:44:42 UTC 
Thanks Peter for working on this.  I will try to test your build.
Comment 7 Jens Petersen 2012-07-13 01:20:50 UTC 
(In reply to comment #5)
> This is the build 
> http://arm.koji.fedoraproject.org/koji/taskinfo?taskID=959567

I successfully tested it on armv5tel and it fixes the ghc segfaults
so looks good to me (tested both hello.hs and building the hscolour
package in mock).

I can try to test armv7hl later using the koji static repo
(the arm rawhide seems to have some perl breakage today.)