__emutls_get_address link problem

Christian Maeder Christian.Maeder at dfki.de
Thu Aug 26 05:08:20 EDT 2010

scooter.phd at gmail.com schrieb:
> Christian:
> Is it possible that you might have code compiled with an older version of ghc lying around in an odd place in your build hierarchy? I would imagine that you upgraded cabal-installed packages. If for some reason you copied or used rsync to replicate a directory tree onto the older machine, then that would explain why you are seeing these difficulties.

No, I had a plan link error, that I resolved by supplying a (gcc)
library that  contained the missing symbol.

I was hoping, that it was a configure issue (during compilation of ghc
or during installation of a binary ghc distribution), but it does not
look like it.

I will not sell my hack. I just wanted to avoid to install a newer gcc
or build an extra binary distribution (for that old sparc).

Thanks for any feedback

> -scooter 
> Sent from my Verizon Wireless BlackBerry
> -----Original Message-----
> From: Simon Marlow <marlowsd at gmail.com>
> Sender: glasgow-haskell-users-bounces at haskell.org
> Date: Wed, 25 Aug 2010 16:39:43 
> To: Christian Maeder<Christian.Maeder at dfki.de>
> Cc: <glasgow-haskell-users at haskell.org>
> Subject: Re: __emutls_get_address link problem
> On 25/08/2010 16:37, Christian Maeder wrote:
>> Christian Maeder schrieb:
>>> Simon Marlow schrieb:
>>>> On 23/08/2010 17:45, Brandon S Allbery KF8NH wrote:
>>>>> Hash: SHA1
>>>>> On 8/23/10 11:57 , Christian Maeder wrote:
>>>>>> However, when I try to compile the simplest source with on older
>>>>>> gcc-3.4.4 I get the link error below, but only for the threaded rts!
>>>>>> With ghc-6.12.1 and gcc-4.x.y (x<   3) I did not have such a problem when
>>>>>> switching to a machine that only has gcc-3.4.4.
>>>>> You got lucky; mixing GCC major versions like that is not expected (much
>>>>> less guaranteed) to work in general.  GCC evidently changed the way it
>>>>> implements some thread support routines between gcc3 and gcc4.
>> Why should it not be possible to create object files (like also dynamic
>> libs) with (very) different compilers?
> This is a case where the ABI changed between versions of gcc (I 
> presume).  It rarely happens with C code, but happens more often with 
> C++, and, of course, in GHC we change the ABI with every single release 
> so you should be used to this by now :-)
>>>> In particular, thread-local variables, which are used by the parallel GC.
>>> I'm just testing if I get runtime problems, but the linking error goes
>>> away, if I put libgcc_eh.a from gcc-4.3.3 into ghc's libdir.
>> The hack seems to work, although it looks dangerous regarding other
>> symbols from libgcc_eh.a that should be in sync with the used gcc-3.4.4.
> I wouldn't trust it.  Why do you need to mix code compiled by two 
> different gcc versions?
> Cheers,
> 	Simon
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