Bug#763078: ghc no longer builds working executables on armel, armhf

[Joey Hess]

Package: ghc, llvm
Version: 7.6.3-16
Severity: serious

It seems that ./Setup configure segfaults:

(sid_armhf-dchroot)joeyh at harris:/tmp/git-annex-5.20140926$ ./dist/setup/setup configure            
Segmentation fault

https://buildd.debian.org/status/fetch.php?pkg=git-annex&arch=armel&ver=5.20140926&stamp=1411825516

This segfault is reproducible (happened on armel and armhs buildds and then I
reproduced it on harris.debian.org). git-annex built ok last week.

Even worse, main = print "hello" is miscompiled on armhf:

(sid_armhf-dchroot)joeyh at harris:/tmp$ ghc --make test
[1 of 1] Compiling Main             ( test.hs, test.o )
You are using a new version of LLVM that hasn't been tested yet!
We will try though...
Linking test ...
./test
(sid_armhf-dchroot)joeyh at harris:/tmp$ ./test
Illegal instruction

And the same simple program no longer works on armel either:

(sid_armel-dchroot)joeyh at abel:~/tmp$ ghc --make test
[1 of 1] Compiling Main             ( test.hs, test.o )
You are using a new version of LLVM that hasn't been tested yet!
We will try though...
Linking test ...
(sid_armel-dchroot)joeyh at abel:~/tmp$ ./test
test: schedule: re-entered unsafely.
   Perhaps a 'foreign import unsafe' should be 'safe'?
(sid_armel-dchroot)joeyh at abel:~/tmp$ echo $?
1

I think that this was cuased by the introduction of llvm-3.5, while
ghc etc was built using llvm-3.4.

-- 
see shy jo
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