While working on reproducible builds for openSUSE, I found that
our volk package is compiled with avx instructions when available on a build machine.

Detection happens in lib/CMakeLists.txt


Here is a partial diff between -cpu host and -cpu kvm64 builds
on a avx2 capable host

  -- Performing Test have_mavx512f - Success
  -- Performing Test have_mavx512cd
  -- Performing Test have_mavx512cd - Success
- -- CPU missing xgetbv, Overruled arch avx
- -- Available architectures: generic;64;3dnow;abm;popcount;mmx;fma;sse;sse2;orc;norc;sse3;ssse3;sse4_a;sse4_1;sse4_2;avx2;avx512f;avx512cd
+ -- Available architectures: generic;64;3dnow;abm;popcount;mmx;fma;sse;sse2;orc;norc;sse3;ssse3;sse4_a;sse4_1;sse4_2;avx;avx2;avx512f;avx512cd
+ -- Available machines: generic_orc;sse2_64_mmx_orc;sse3_64_mmx_orc;ssse3_64_mmx_orc;sse4_a_64_mmx_orc;sse4_1_64_mmx_orc;sse4_2_64_mmx_orc;avx_64_mmx_orc;avx2_64_mmx_orc;avx512f_64_mmx_orc;avx512cd_64_mmx_orc
+ -- BUILD INFO ::: avx_64_mmx_orc ::: GNU ::: -O2 -g -DNDEBUG -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -flto=auto -DNDEBUG -Wall -m64 -mmmx -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -mpopcnt -mavx