LLVM 3.2 failure

[Austin Seipp]

I was able to reproduce Geoffrey's failure on Mac OS X 10.8, with LLVM
3.2. The stage2 compiler eventually segfaults ("Segmentation Fault
11") during the build process after being compiled successfully with
stage1.

Something recently happened, because I was bootstrapping fine with
LLVM 3.2 recently after David's fixes landed (I filed a small raft of
tickets.) It's times like these I really wish we had a reliable 'git
bisect'...

I unfortunately haven't had time to dig into this, but I'll file a
ticket to track it this morning. I can also reproduce this on my
ARM/Linux machine. Previously, I got it to at least get done with
stage2, and fail later in DPH. Now it seems to fail earlier in the
same way the OS X build does.

OS's:

- 32bit ARM/Linux, Ubuntu 12.10 Linaro derivative; GCC 4.6.3.
Bootstrapping compiler is GHC 7.4.1, LLVM 3.2.
- 64bit OS X 10.8 Mountain Lion, llvm-gcc (XCode 4.6.) Bootstrapping
compiler is GHC 7.6.2, LLVM 3.2.

Also, @Jan: the warnings during the build process probably come from
your bootstrap compiler. The built compiler (stage1/stage2) both
support LLVM 3.2 directly and have correct version checks, but the
bootstrap compiler you're using won't. In practice this mismatch never
proved a problem in the past; just weeks ago the entire tree validated
with the LLVM build on OS X with no failures and I was working on ARM
things.

I'll file a ticket and dig in soon when I get a chance.

On Thu, Mar 14, 2013 at 9:29 AM, Geoffrey Mainland <mainland at apeiron.net> wrote:
> On 03/14/2013 02:15 PM, Jan Stolarek wrote:
>>> Hm, you're sure that LLVM 3.2 is in your path when you configure GHC?
>> I removed LLVM 3.0 from my system so there's no possibility of
> mistaking 3.2 with 3.0. I'm also
>> getting lots of compilation warnings about untested LLVM version -
> this didn't happen with 3.0.
>>
>>> This is HEAD?
>> Yes. Commit 56353e3da9d5718dfd25e25ccf61c78b25deefe8
>>
>>> Linux x64?
>> Yes:
>>
>> [killy at xerxes : ~] uname -a
>> Linux xerxes.discovery 2.6.37.6-24-desktop #1 SMP PREEMPT 2012-10-18
> 22:36:08 +0200 x86_64 x86_64
>> x86_64 GNU/Linux
>>
>>> What is in your build.mk file?
>> The relevant parts are:
>>
>> BuildFlavour = quick-llvm
>>
>> ifeq "$(BuildFlavour)" "quick-llvm"
>>
>> SRC_HC_OPTS        = -H64m -O0 -fllvm
>> GhcStage1HcOpts    = -O -fllvm
>> GhcStage2HcOpts    = -O0 -fllvm
>> GhcLibHcOpts       = -O -fllvm
>> SplitObjs          = NO
>> HADDOCK_DOCS       = NO
>> BUILD_DOCBOOK_HTML = NO
>> BUILD_DOCBOOK_PS   = NO
>> BUILD_DOCBOOK_PDF  = NO
>>
>> endif
>>
>> As you can see I'm not building the documentation. It's because it
> fails to build on my system and
>> I don't care much about resolving that.
>>
>> Janek
>
> You don't have the following line?
>
> GhcLibWays = $(if $(filter $(DYNAMIC_BY_DEFAULT),YES),dyn,v)
>
> I ask because I am using a stock build.mk copied from build.mk.sample
> with BuildFlavour = quick-llvm, GHC HEAD, and LLVM 3.2, and my stage2
> compiler crashes. It would be good to know *exactly* what the contents
> of your build.mk are.
>
> What version of GHC are you using to perform the build? Are you using
> parallel make?
>
> Thanks,
> Geoff
>
>
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--
Regards,
Austin