dependency on land_model_mod.mod from AM4

[edwardhartnett]

I have a autotools based build system for FMScoupler, but unfortunately FMSCoupler depends on land_model_mod.mod from AM4. Meanwhile AM4 depends on FMSCoupler.

Your home-rolled build system + your methods of building (a.k.a. your "workflow") are hiding your inter-dependencies. I suggest you get those dependencies sorted out and decide what packages are going to depend of what other packages.

[thomas-robinson]

@edwardhartnett I responded to your issue on NOAA-GFDL/AM4#14 . I think I can help you build land_model_mod.mod. The FMScoupler depends on the model components such as land, atmosphere, ocean, and ice. coupler_main.F90 or coupler_main.F90 contains the program statement for the model. The AM4 is a model configuration, so it uses coupler_main.F90 as it's main program. The current build system used by AM4 compiles all of the model components as libraries, and then links them together at the end.

Currently, land_lad2, atmos_shared, atmos_param, and atmos_drivers are only available with AM4 or CM4. I am hopeful that this will change soon.

[underwoo]

@edwardhartnett and @thomas-robinson, please look at the t/null_model_build.sh script. It has what is required to build coupler_main.F90 using the null model components. This should be enough to get an autotools version of FMSCoupler library built.

[edwardhartnett]

@underwoo I looked at that script and my brain melted.

I took a different approach, and found that there a seemingly other dependencies anyway, include ice_albedo_model and other _model mods that probably come from AM4.

OK I will put up my non-working build system so you can take a look, and then we will see if we can get the AM4 build system working, so I can build that, and then try this one again. ;-)