Changes to CMakeLists.txt for FMS

[mlee03]

Description

This PR updates CMakeLists.txt, io/CMakeLists.txt, and stochastic_physics/CMakeLists.txt to be compatible with the FMS CMakeLists.txt. The fms target has been changed to FMS::fms_r4 for 32BIT or FMS::fms_r8 for a 64BIT compilation. This change is necessary for the UFS Weather Model to use the FMS CMakeLists.txt file. Answer changes are not expected.

Issue(s) addressed

• fixes Update CMakeLists.txt for FMS  #242

Testing

Regression tests are currently running after making last minute minor changes.

Dependencies

[mlee03]

@aerorahul,

could you review to make sure everything looks ok? Thank you!

[aerorahul]

This is fine for now, but in the subsequent PR's we could use an alias target when FMS is provided as a module or "third-party library" or built in the UFS (as is the case now).
This can be achieved by something like this in the UFS:

find_package(FMS QUIET)
if (FMS_FOUND)
  if (32BIT)
    add_library(fms ALIAS FMS::fms_r4)
  else()
    add_library(fms ALIAS FMS::fms_r8)
  endif()
else()
  add_subdirectory(FMS)
  if (32BIT)
    add_library(fms ALIAS FMS::fms_r4)
  else()
    add_library(fms ALIAS FMS::fms_r8)
  endif()
endif()

All downstream targets can then use fms without the need for and if-else block scattered everywhere.

[aerorahul]

Changes look good to me. Please look at my comment and check to see if that works. I have not tried it myself and it may need a slight tweaking, but that is the general concept in using that ALIAS target.

[mlee03]

This change is not necessary.