CESM_share: preprocess .F90.in files using genf90 rather than using a static copy

[dougiesquire]

This PR removes the static copies of the CESM_share source files from the share/src directory. Instead, these sources are generated at build time from the template *.F90.in files in CESM_share.

The template files are processed using the genf90.pl script, which has been added as a git submodule. Note, genf90.pl is actually already included as a submodule in CDEPS but it felt awkward to me to use that version to process files in CESM_share. Let me know if you disagree and you would prefer to have one less git submodule.

I've checked that this builds locally, but will also spin off some repro tests with ACCESS-OM3 now.

Contributes to #23

[dougiesquire]

Testing confirms that this change does not change answers. See linked PRs in ACCESS-NRI/ACCESS-OM3#181

[anton-seaice]

Note, genf90.pl is actually already included as a submodule in CDEPS but it felt awkward to me to use that version to process files in CESM_share

I guess that CESM use the one from CDEPS though right? It's convenient to use the CDEPS one so we don't have to update the genf90 submodule ever?

I am happy enough this builds and doesn't change answers, does it need a review from a CMake person ?

[dougiesquire]

Note, the CMake code for preprocessing the templates is loosely based on code from CIME:

• genf90_utils.cmake
• CIME_utils.cmake

[dougiesquire]

I guess that CESM use the one from CDEPS though right? It's convenient to use the CDEPS one so we don't have to update the genf90 submodule ever?

It's also in CIME and I think CESM uses that one. I thought that having our own submodule would make it easier to make sure we use the same version as CESM. Although currently CDEPS and CIME have the same version and it doesn't look like the package is updated very often...

[dougiesquire]

I am happy enough this builds and doesn't change answers, does it need a review from a CMake person ?

I think I'm comfortable with it - it follows the same approach as CIME. But it's your call really

[anton-seaice]

I guess that CESM use the one from CDEPS though right? It's convenient to use the CDEPS one so we don't have to update the genf90 submodule ever?

It's also in CIME and I think CESM uses that one. I thought that having our own submodule would make it easier to make sure we use the same version as CESM. Although currently CDEPS and CIME have the same version and it doesn't look like the package is updated very often...

I guess if we end up with a list of where to check dependencies we need to add genf90 ?

[chrisb13]

I guess if we end up with a list of where to check dependencies we need to add genf90 ?

@anton-seaice suggest adding to this then: https://github.com/ACCESS-NRI/access-om3-configs/blob/main/.github/ISSUE_TEMPLATE/upstream-model-component-update-.md
?