ctsm5.4.021

[CTSM Gatekeeper]

*** RESPONSES TO THIS EMAIL WILL NOT BE READ ***
===============================================================
Tag name: ctsm5.4.021
Originator(s): erik (Erik Kluzek,UCAR/TSS,303-497-1326)
Date: Fri Feb 20 08:19:42 PM MST 2026
One-line Summary: Bring b4b-dev to master

Purpose and description of changes
----------------------------------

Some fixes to use the ifx compiler. Added handling of gzipped files in the short term archiver
needed for DART. Use a CMake funciton for the PfUnit build. Make sure mksurfdata_esmf PIO library is
used as shared in the build. Fix to a typo in the Technical Note.

Use pytest instead of unittest in our python unit test framework, which allows many modern features.
One test file, test_unit_longitude.py, has been modified to use pytest's "parametrize" functionality as an example. Most of the changed lines in that file are just whitespace differences.

Existing run_ctsm_py_tests arguments have been ported to replicate the same functionality in pytest. Unknown arguments will be passed to pytest directly.

Also: Made it so that the tests can be called from anywhere in the checkout, instead of only python/.

Significant changes to scientifically-supported configurations
--------------------------------------------------------------

Does this tag change answers significantly for any of the following physics configurations?
(Details of any changes will be given in the "Answer changes" section below.)

[Put an [X] in the box for any configuration with significant answer changes.]

[ ] clm6_0

[ ] clm5_0

[ ] ctsm5_0-nwp

[ ] clm4_5


Bugs fixed
----------

List of CTSM issues fixed (include CTSM Issue # and description) [one per line]:

Resolves #3762 by Bill Sacks ifx issues
Resolves #3763 by Bill Sacks Floating invalid with ifx
Resolves #3774 by Erik Kluzek NaN's in Prigent and urbantv streams
Resolves #3082 by Kevin Raeder st_archive for DART
Resolves #3616 by Sam Rabin convert python unittests to pytest
Resolves #3035 by Keith Oleson typo in LW documentation in tech. note

Notes of particular relevance for users
---------------------------------------

Changes to CTSM's user interface (e.g., new/renamed XML or namelist variables):
The Short Term archiver can now also save files that are g-zipped
This is something that is needed for DART

Changes to the datasets (e.g., streams, surface or initial files):
New Prigent and urbantv streams datasets with NaN's removed

Changes to documentation: Fix issue in tech. note

Notes of particular relevance for developers: regular
---------------------------------------------

Caveats for developers (e.g., code that is duplicated that requires double maintenance):
The ctsm_pylib conda environment changed! Rerun py_env_create to update it

Changes to tests or testing:
Python unit test framework changed from unittest to pytest. So now pytest functionality can be used
in tests

Testing summary: regular
----------------
[PASS means all tests PASS; OK means tests PASS other than expected fails.]

build-namelist tests (if CLMBuildNamelist.pm has changed):

derecho - OK

python testing (if python code has changed; see instructions in python/README.md; document testing done):

derecho - PASS

regular tests (aux_clm: https://github.com/ESCOMP/CTSM/wiki/System-Testing-Guide#pre-merge-system-testing):

derecho ----- OK
izumi ------- OK

If the tag used for baseline comparisons was NOT the previous tag, note that here:


Answer changes
--------------

Changes answers relative to baseline: No bit-for-bit

Other details
-------------

Pull Requests that document the changes (include PR ids):
(https://github.com/ESCOMP/ctsm/pull)

#3765 Fixes for ifx, from Bill Sacks
#3084 Added code to make st-archive handle DART files, from Kevin Raeder
#3761 Use pytest instead of unittest in run_ctsm_py_tests, from Sam Rabin
#3582 Use a CMake function provided by CIME, from Bill Sacks
#3700 Fix mksurfdata CMakeLists.txt: use SHARED for .so PIO libraries, from Cooper DeVane-Prugh
#3220 Tech Note: Distinguish between time step and iteration level in vegetation longwave and fluxes, from Keith Oleson

===============================================================
===============================================================