Spack Components for OM3

[anton-seaice]

This is an extremely draft collection of changes to spack-packages to build OM3 by component.

I've been building access3-share with '+install_libraries' in the spec, I haven't looked at building with an executable yet

I've been using these git versions :

https://github.com/ACCESS-NRI/CICE/tree/5-port_cmake_build

and

https://github.com/ACCESS-NRI/access3-share/tree/share_prototype

Example deployment: ACCESS-NRI/ACCESS-OM3#35

[anton-seaice]

Contributes to #163

[anton-seaice]

This is still a draft but is ready for a review for style / approach.

I've only implemented for CICE6 at this point, see the example deployment in ACCESS-NRI/ACCESS-OM3#35

[anton-seaice]

In deployment, I have been trying to build 'access3-exe' with 'configurations=CICE6'

When concretising, the requested configuration gets added to the default:

 -   myn2njk      ^access3-exe@git.share_prototype=0-git.175%intel@2021.10.0~ipo~openmp build_system=cmake build_type=Release configurations=CICE6,CICE6-WW3,MOM6-CICE6,MOM6-CICE6-WW3 generator=make arch=linux-rocky8-x86_64

The default in the access3-exe spack package is for 'configurations = CICE6-WW3,MOM6-CICE6,MOM6-CICE6-WW3' and so the CICE6 gets added to this list rather than replacing it. There doesn't appear to be a way in spack to remove variants, when multi=True (i.e. multiple are supported). So i think I will set the default to be None.

The spack MultiValuedVariant class only has an append function (no remove function ...), see https://github.com/spack/spack/blob/2447d16e55d800e6a9cb82a645ab9edfd24f08ac/lib/spack/spack/variant.py#L503

[anton-seaice]

Should these have when statements ?

[anton-seaice]

Suggested change

	version("cmake_build",
	git="https://github.com/ACCESS-NRI/MOM6.git",
	branch="cmake_build",
	submodules=True,
	preferred=True,
	)
	version("dev/access", branch="dev/access",preferred=True)

[anton-seaice]

Suggested change

	url = "https://github.com/CICE-Consortium/CICE/archive/refs/tags/CICE6.6.0.tar.gz"
	version("6.6.0", md5="1c678c0af67bf09f92c0a861344c3a92")

Shall we pre-emptively create a version("access-om3", branch="main") here ?