Hi @dkhutch , Sounds like access-om2 has problems when built by GCC.
I was able to build it using oneapi@2025.2.0 compiler on NeSI. I’ve updated the instructions at How to build ACCESS-OM2 on NeSI HPC . The biggest difference is that Spack will install the Intel oneapi compiler instead of using system compilers. Note, I tried to do this with the old Intel Classic compilers, but libiconv failed to build.
Serendipitously, @dougiesquire has been doing some testing of access-om2 built with oneapi@2025.2.0 on Gadi: Update to oneapi compiler (and openmpi/5.0.8) · Issue #212 · ACCESS-NRI/access-om2-configs · GitHub