set _FILE_VERSION macro during compilations

[rem1776]

Is your feature request related to a problem? Please describe.
Basically all of the component codes requires an include path for FMS/include to use the file_version.fh file. This file just sets the current version of FMS so it can be written out by write_file_version in the component code. Currently, it is not being set so will always be 'unknown'.

Describe the solution you'd like
mkmf has an option -g which will automagically set this value to the current git hash, it just needs to be added to the compile scripts when generating the makefile for FMS.

Describe alternatives you've considered
we could also just not write the version numbers, seems kinda unnecessary. Unfortunately, updating all the components to not use it would probably be more effort than its worth.

[mlee03]

Are these issues arising from using the Gem? It was just updated to take into account the include paths to FMS and MOM6.
Can you try using it again?

[rem1776]

No you would see this issue regardless of model/yaml config. It's just a macro value that should be set during FMS compilation, otherwise the included file won't do anything useful.

[mlee03]

define the macro as part of otherFlags?

[rem1776]

We could set it that way but then we'd always have to update it in the yamls. Better to have mkmf set it, especially since that option is was added for for exactly this.

[mlee03]

🪄

[ceblanton]

mkmf won't be around forever, though