[gmx-users] Error: Cannot find AVX 512F compiler flag

[Schulz, Roland]

Are you actually using the GCC from the devtoolset or the default one? Cmake tells you at the very beginning which compiler it is using.

Roland

> -----Original Message-----
> From: gromacs.org_gmx-users-bounces at maillist.sys.kth.se <gromacs.org_gmx-
> users-bounces at maillist.sys.kth.se> On Behalf Of Shlomit Afgin
> Sent: Wednesday, January 15, 2020 12:51 AM
> To: gmx-users at gromacs.org
> Subject: [gmx-users] Error: Cannot find AVX 512F compiler flag
> 
> 
> Hi,
> I tried to install GROMACS 2019.5 on CentOS7, cmake .. -
> DGMX_BUILD_OWN_FFTW=ON -DREGRESSIONTEST_DOWNLOAD=ON
> 
> I have already installed devtoolset-6 and still get this error:
> 
> -- Performing Test CXX_COMPILE_WORKS_WITHOUT_SPECIAL_FLAGS
> -- Performing Test CXX_COMPILE_WORKS_WITHOUT_SPECIAL_FLAGS - Failed
> -- Could not find any flag to build test source (this could be due to either the
> compiler or binutils)
> -- Could not identify number of AVX-512 units - detection program missing
> compilation prerequisites
> -- Could not run code to detect number of AVX-512 FMA units - assuming 2.
> -- Detected best SIMD instructions for this CPU - AVX_512 CMake Error at
> cmake/gmxManageSimd.cmake:51 (message):
>   Cannot find AVX 512F compiler flag.  Use a newer compiler, or choose a
>   lower level of SIMD (slower).
> Call Stack (most recent call first):
>   cmake/gmxManageSimd.cmake:186
> (gmx_give_fatal_error_when_simd_support_not_found)
>   CMakeLists.txt:719 (gmx_manage_simd)
> 
> 
> Thanks,
> Shlomit
> --
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