Add special-case for oneAPI within cmake

[manodeep]

The new cmake system special-cases for oneAPI here for setting C compiler flags; we should probably add a similar logic for setting the MOM5 fortran flags.

Here is an example of how that is done within FMS.

Note: The logic for IntelLLVM might need to precede that for Intel.

[dougiesquire]

Sure - I just used MATCHES "Intel" when first setting this up because the flags were the same for both. But if there's now a reason for them to diverge we'll need specific clauses.

Note: The logic for IntelLLVM might need to precede that for Intel.

Order won't matter. Just need to use STREQUAL for the comparison

[dougiesquire]

Have you got oneAPI-specific Fortran flags you want to add?

[manodeep]

Just matching for now should be fine. Need to think about where/how to add the -fpe3 flag for the 2025.0.4 oneAPI compiler

[dougiesquire]

Can it wait until there's actually a functional change we want to make (just to minimize the number of PRs)?

[manodeep]

If you prefer - the cmake change feels incomplete without the oneAPI bit - but I also see your perspective of reducing the total number of changes going in (unless necessary).

I will leave this as your call and keep the issue open then.

[dougiesquire]

Just to clarify, the condition here uses MATCHES rather than STREQUAL. So both Intel and IntelLLVM enter this clause. That is, the flags for ifort and ifx are set the same. When we have a reason to treat them differently we can make the change.