Add Fortran API for FunctionSpace checksum with array support#389
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wdeconinck merged 3 commits intoJun 16, 2026
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This pull request improves the Fortran API for function space checksums, with a focus on deprecating old methods, expanding array API support, and improving deprecation handling. The changes also include new tests and internal refactoring to support these updates.
Key changes:
Deprecation Handling and Warnings
atlas_Deprecation_module.F90that provides environment-variable-controlled deprecation warnings and errors, allowing users to enable or disable deprecation messages for legacy API usage. [1] [2]get_checksummethods inCellColumns,EdgeColumns, andNodeColumnsmodules to emit warnings or errors (with clear migration guidance) when used, utilizing the new deprecation module and providing one-time warning subroutines. [1] [2] [3]Array API Expansion and Refactoring
atlas_FunctionSpace_module.F90to a Fypp template (atlas_FunctionSpace_module.fypp), and added a family ofchecksum_<dtype>_r<rank>functions, enabling direct checksum computation on arrays of various types and ranks. The genericchecksuminterface is now expanded to include these. [1] [2] [3] [4] [5]Testing Improvements
test_blockstructuredcolumns_checksum_array_api) to verify the new array API for checksums, ensuring correct results for various array slices and dimensions.These changes modernize the Fortran API, encourage migration to new interfaces, and provide robust mechanisms for managing deprecated functionality.
💣💥☠️ Static Analyzer Report ☠️💥💣
https://sites.ecmwf.int/docs/atlas/static-analyzer/PR-389