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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
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