When `um-atmos.exe` and `um-recon.exe` are built from (e.g.) [u-by395/u-by395_nci_access_ram3](https://code.metoffice.gov.uk/trac/roses-u/browser/b/y/3/9/5/u-by395_nci_access_ram3?rev=330956&order=name) the compiler flags ``` -march=skylake-avx512 -mtune=skylake-avx512 ``` are not included in the default `safe` build. Try matching this by using `target=x86_64` instead of `target=x86_64_v4` in `spack.yaml`.
When
um-atmos.exeandum-recon.exeare built from (e.g.) u-by395/u-by395_nci_access_ram3 the compiler flagsare not included in the default
safebuild. Try matching this by usingtarget=x86_64instead oftarget=x86_64_v4inspack.yaml.