[MITgcm-support] configuring compilation dependencies in Makefile

[Jean-Michel Campin]

Hi Dan,

The convention that is currently used is that F90 modules are declared inside src file
with a name that finishes with "_mod.F" (if fixed format, like in pkg/ptracers) or
with "_mod.F90" (if free format, like in pkg/atm_phys).
With these type of sufix the f90makedepend is able to work and make sure things are
compiled in the right order.

May be your pkg/streamice src files that contains F90 modules could follow the same 
convention ?

Cheers,
Jean-Michel

PS: Oliver might know more about these pieces.

On Thu, Jul 27, 2023 at 08:50:42AM +0000, Daniel Goldberg wrote:
> Hello there
> 
> I am working with a package (STREAMICE) which, depending on options, makes use of a subroutine<https://github.com/MITgcm/MITgcm/blob/master/pkg/streamice/streamice_cg_solve_petsc.F> which "uses" a module<https://github.com/MITgcm/MITgcm/blob/master/pkg/streamice/streamice_arg_common_petsc.F>, and therefore the source should be compiled after the module source. (I'm required to use the module, rather than a common block, due to restrictions of an external library, PETSc.) I've only been able to do this by compiling without the -j option and ensuring the alphabetical order of compilation.
> 
> However, I have seen that some packages (e.g. ptracers) trigger what looks like dependencies in the Makefile, e.g.
> 
> PTRACERS_MOD.h: ptracers_dyn_state_mod.o ptracers_dyn_state_data_mod.o
> 
> Assuming this actually is a dependency of the type I seek, Im not able to figure out how it was generated. One difference is that "ptracers_dyn_state_data_mod" is used in a header file (PTRACERS_MOD.h). Is there any way to change genmake2, or a file read by it, in order to ensure the compilation order I seek even when using parallel compilation?
> 
> Many thanks
> Dan
> 
> --
> Daniel Goldberg, PhD (he/him)
> Reader in Glaciology
> School of Geosciences, University of Edinburgh
> Geography Building, Drummond Street, Edinburgh EH8 9XP
> 
> Please note I am not working Mondays during June/July/August 2023 due to childcare responsibility.
> 
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