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

[Alexey Shvetsov]

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
> http://cmb.bio.uni-goettingen.de/
> ---------------------------------------------------

-- 
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