[Trilinos-Users] llvm-gcc / clang

[Holger Brandsmeier]

Brent,

will Trilinos also work with clang (also part of llvm and mostly
compatible to gcc) or only llvm-gcc? I actually never used llvm-gcc,
does it produces as nice error messages as clang?

Do those errors occur if I use clang to compile trilinos itself, or
also if I build trilinos with gcc and use clang to build a library
which links against trilinos? I never experienced such problems in the
second variant and I already do that for a year now. Including the use
of fortran based lapack / blas implementations.

As for clang, I ocasionaly got crashes of the compiler itself, which
disappeared once I started to use very recent versions of clang (3.1).
I noticed that I didn't have to change any header files for Trilinos
10.10 any more, which I still had to fix quite a few headers for 10.6.
Thanks for that.

-Holger



On Thu, Apr 12, 2012 at 01:15, Perschbacher, Brent M <bmpersc at sandia.gov> wrote:
> Chris,
>  I have a couple suggestions that may help you. First I highly recommend
> using the cmake build of clapack instead of the provided Makefiles. The
> biggest reason is that by default the provided Makefiles mangle the blas and
> lapack library names differently which makes it difficult to link against
> them. The cmake build by default does not do that. Given that the cmake
> build for clapack was actually done for the Trilinos project it is generally
> more likely to work effortlessly with Trilinos.
>
> We also know of several issues with the llvm compiler that could be causing
> you problems. I've actually recently fixed most of the build errors llvm,
> however we haven't provided a bug release with those changes yet. There is
> one coming, but in the  mean time I would highly recommend using a gcc that
> does not use llvm as the back end, we currently test against 4.3, 4.4, 4.5
> and 4.6 so any of those should be pretty safe to use.
>
> I hope this helps,
>
> Brent
>
>
> On 4/11/12 3:24 PM, "Christian Staudt" <christian.staudt at ira.uka.de> wrote:
>
>> Thanks, I'll describe the situation:
>>
>> I am running Mac OS X 10.6 on x86, gcc is: i686-apple-darwin10-llvm-gcc-4.2,
>> gfortran is i686-apple-darwin10-gfortran-4.2.1
>>
>> Basically, I am trying to follow the instructions from [1], therefore I have
>>
>> - built CLAPACK, using the example make.inc file and running "make", producing
>> lapack_OSX.a and blas_OSX.a - no error messages
>> - run my custom do-configure script [4] in which I have given the location of
>> BLAS and LAPACK (correctly?), producing the following output: [3]
>> - run "make" in the Trilinos target directory, which fails with following
>> output: [2]
>>
>> I see that several tests from the do-configure script have "Failed". However,
>> I do not know how to proceed from here.
>>
>> Chris
>>
>>
>> [1] https://code.google.com/p/trilinos/wiki/TrilinosHandsOnTutorial
>>
>> [2] http://pastebin.com/SaRxYEaE
>>
>> [3] http://pastebin.com/XpXuVX3p
>>
>> [4] http://pastebin.com/aunLq554
>>
>>
>>
>>
>>
>>
>> Am 11.04.2012 um 22:05 schrieb Heroux, Michael A:
>>
>>> Chris,
>>>
>>> What kind of computer system are you running on?  Give us a few details
>>> about your situation.
>>>
>>> Thanks.
>>>
>>> Mike
>>>
>>> On 4/11/12 2:35 PM, "Christian Staudt" <christian.staudt at ira.uka.de> wrote:
>>>
>>>> Hello Trilinos users,
>>>>
>>>> I'm working on a multigrid scheme for solving linear systems where the
>>>> system matrix is a graph Laplacian. The project will be based on either
>>>> PETSc or Trilinos - I am new to both. From what I have read, I gravitate
>>>> towards Trilinos.
>>>>
>>>> However, I have had no success building Trilinos so far. The error I run
>>>> into during the "make" step is related to CLAPACK. Before I go into more
>>>> details: Are installation troubleshooting questions/discussions
>>>> appropriate on this list?
>>>>
>>>> Regards
>>>> Chris
>>>>
>>>> _______________________________________________
>>>> Trilinos-Users mailing list
>>>> Trilinos-Users at software.sandia.gov
>>>> http://software.sandia.gov/mailman/listinfo/trilinos-users
>>>
>>>
>>
>>
>>
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>
>
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-- 
Holger Brandsmeier, SAM, ETH Zürich
http://www.sam.math.ethz.ch/people/bholger