Dear Bruno,
This is a regular error and not related to the actual problem I believe.
This is simply the message that we use to detect what SIMD extensions we
can enable, and in your case the compilation does not support AVX. But I
think further down in the CMakeFiles/CMakeError.log file you should find
the culprit.
As a side remark, the AMD Rome architecture does indeed support AVX2, as
long as you pass "-mavx2 -mfma" or "-march=znver2" or simply
"-march=native" to the compile flags ("CMAKE_CXX_FLAGS"). However, AMD
does not (yet) support AVX-512, which might be what you're referring to.
In other words, the compiler needs to be told what kind of architecture
extensions are supported on the target CPU. I most often use
"-march=native" unless I'm cross-compiling on a different CPU compared
to where the code is eventually executed.
Best,
Martin
On 29.10.21 12:47, [email protected] wrote:
Wolfgang, you are a genius.
The exact error I am getting is related to AVX instructions not being
available. I think this is normal because this is an AMD Rome based
cluster and not an intel one.
Run Build
Command(s):/cvmfs/soft.computecanada.ca/gentoo/2020/usr/bin/gmake
cmTC_be568/fast &&
/cvmfs/soft.computecanada.ca/gentoo/2020/usr/bin/gmake -f
CMakeFiles/cmTC_be568.dir/build.make CMakeFiles/cmTC_be568.dir/build
gmake[1]: Entering directory
'/home/blaisbru/dealii/build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_be568.dir/src.cxx.o
/cvmfs/soft.computecanada.ca/easybuild/software/2020/Core/gcccore/9.3.0/bin/c++
-DDEAL_II_HAVE_AVX -o CMakeFiles/cmTC_be568.dir/src.cxx.o -c
/home/blaisbru/dealii/build/CMakeFiles/CMakeTmp/src.cxx
/home/blaisbru/dealii/build/CMakeFiles/CMakeTmp/src.cxx:3:6: error:
#error "__AVX__ flag not set, no support for AVX"
3 | #error "__AVX__ flag not set, no support for AVX"
| ^~~~~
/home/blaisbru/dealii/build/CMakeFiles/CMakeTmp/src.cxx: In function
‘int main()’:
/home/blaisbru/dealii/build/CMakeFiles/CMakeTmp/src.cxx:35:9: warning:
AVX vector return without AVX enabled changes the ABI [-Wpsabi]
35 | b = _mm256_set1_pd (static_cast<volatile double>(2.25));
| ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
gmake[1]: *** [CMakeFiles/cmTC_be568.dir/build.make:66:
CMakeFiles/cmTC_be568.dir/src.cxx.o] Error 1
gmake[1]: Leaving directory
'/home/blaisbru/dealii/build/CMakeFiles/CMakeTmp'
gmake: *** [Makefile:121: cmTC_be568/fast] Error 2
Hopefully I find a solution from there :)!
On Thursday, October 28, 2021 at 11:20:42 p.m. UTC-4 Wolfgang Bangerth
wrote:
On 10/28/21 8:02 PM, [email protected] wrote:
>
> However, whenever I run CMAKE using deal.II AND enabling
Trilinos, I get the
> following error:
> Configuration error: Cannot compile a test program with the
final set of
> compiler and linker flags:
> CXX flags (DEBUG): -pedantic -fPIC -Wall -Wextra
-Wmissing-braces
> -Woverloaded-virtual -Wpointer-arith -Wsign-compare
-Wsuggest-override
> -Wswitch -Wsynth -Wwrite-strings -Wno-placement-new
> -Wno-deprecated-declarations -Wno-literal-suffix -Wno-psabi
> -Wno-class-memaccess -fopenmp-simd -Wno-parentheses
-Wno-unused-local-typedefs
> -O0 -ggdb -Wa,--compress-debug-sections
Somewhere, in some file that is probably located under CMakeFiles
in your
build directory, it will provide you with whatever error messages
cmake got
when it tried to compile a test program with these flags. If you
know what
that error is, you're probably 75% there towards identifying what
the real
underlying problem is.
Best
W.
--
------------------------------------------------------------------------
Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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