[gmx-developers] Configure error on Macbook Air with gcc - despite GMX_ACCELERATION

[Alexey Shvetsov]

Mark Abraham писал 13-04-2013 22:34:
> Yes, but a newer gcc won't help. IIRC gcc will need an assembler
> later, and there is none for AVX+Mac. There's discussion on a Redmine
> issue somewhere.

Sorry then. I'm not very familar with mac. I know it has its own 
assembler (due to macho binary format), but i dont know if it supports 
new instruction sets.

> 
> Mark
> 
> On Sat, Apr 13, 2013 at 5:38 PM, Alexey Shvetsov
> <alexxy at omrb.pnpi.spb.ru> wrote:
> 
>> Hi!
>> 
>> Try newer gcc version. gcc-4.2 is ancient one.
>> 
>> Jochen Hub писал 13-04-2013 19:33:
>> 
>>> Just solved it and found GMX_CPU_ACCELERATION.
>>> 
>>> Jochen
>>> 
>>> Am 4/13/13 5:21 PM, schrieb Jochen Hub:
>>> 
>>>> Hi all,
>>>> 
>>>> I don't manage to configure 4.6 (latest git version) on my Macbook 
>>>> Air.
>>>> With gcc 4.7 from Macports I always get
>>>> 
>>>>    Cannot compile AVX intrinsics.  Consider switching compiler.
>>>> 
>>>> I tried different -DGMX_ACCELERATION settings (SSE4.1, SSE2, none), 
>>>> but
>>>> this seems to be ignored. The relevant cmake output lines are:
>>>> 
>>>> cmake ... ... -DGMX_ACCELERATION=SSE2
>>>> 
>>>> -- Detecting best acceleration for this CPU - AVX_256
>>>> -- Performing Test GNU_AVX_CFLAG - Success
>>>>    Cannot compile AVX intrinsics.  Consider switching compiler.
>>>> 
>>>> I also tried with the i686-apple-darwin11-llvm-gcc-4.2, but that 
>>>> gives
>>>> 
>>>>    No C AVX flag found.  Consider a newer compiler, or try SSE4.1 
>>>> (lower
>>>>    performance).
>>>>    Cannot find immintrin.h, which is required for AVX intrinsics 
>>>> support.
>>>>    Consider switching compiler.
>>>> 
>>>> So the issue seems that the -DGMX_ACCELERATION=SSE2 flat is 
>>>> ignored, and
>>>> cmake always tries to use AVX.
>>>> 
>>>> Any suggestions how to get 4.6 compiled at present?
>>>> 
>>>> Many thanks,
>>>> Jochen
>>>> 
>>>> For the sake of completeness, this is the cmake line:
>>>> 
>>>> CC=`which gcc-mp-4.7`; CXX=`which g++-mp-4.7`
>>>> 
>>>> FFTW_LOCATION=/Users/jhub/src/fftw/fftw-33
>>>> export CMAKE_PREFIX_PATH=$FFTW_LOCATION
>>>> rm -rf CMake* *.cmake cmake*
>>>> cmake ../gromacs
>>>>      -DCMAKE_INSTALL_PREFIX=$(pwd)
>>>>      -DGMX_X11=OFF
>>>>      -DGMX_MPI=OFF
>>>>      -DCMAKE_CXX_COMPILER=$CXX
>>>>      -DCMAKE_C_COMPILER=$CC
>>>>      -DGMX_GPU=OFF
>>>>      -DGMX_ACCELERATION=SSE2 # or other setting or no line - makes 
>>>> no
>>>> difference.
>>> 
>>> --
>>> ---------------------------------------------------
>>> Dr. Jochen Hub
>>> Computational Molecular Biophysics Group
>>> Institute for Microbiology and Genetics
>>> Georg-August-University of Göttingen
>>> Justus-von-Liebig-Weg 11, 37077 Göttingen, Germany.
>>> Phone: +49-551-39-14189 [1]
>>> http://cmb.bio.uni-goettingen.de/ [2]
>>> ---------------------------------------------------
>> 
>> --
>> Best Regards,
>> Alexey 'Alexxy' Shvetsov
>> Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, 
>> Gatchina, Russia
>> Department of Molecular and Radiation Biophysics
>> Gentoo Team Ru
>> Gentoo Linux Dev
>> mailto:alexxyum at gmail.com
>> mailto:alexxy at gentoo.org
>> mailto:alexxy at omrb.pnpi.spb.ru
>> 
>> --
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> 
> 
> 
> Links:
> ------
> [1] tel:%2B49-551-39-14189
> [2] http://cmb.bio.uni-goettingen.de/
> [3] http://lists.gromacs.org/mailman/listinfo/gmx-developers

-- 
Best Regards,
Alexey 'Alexxy' Shvetsov
Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, 
Gatchina, Russia
Department of Molecular and Radiation Biophysics
Gentoo Team Ru
Gentoo Linux Dev
mailto:alexxyum at gmail.com
mailto:alexxy at gentoo.org
mailto:alexxy at omrb.pnpi.spb.ru