Work around a GNU Fortran bug regarding unlimited polymorphic entities #366
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Part 1 of 2 for MPAS dynamical core. Workaround for a bug in GNU Fortran >= 12. This is perhaps the manifestation of GCC Bugzilla Bug 100819. When a character string array is passed as the actual argument to an unlimited polymorphic dummy argument, its array index and length parameter are mishandled.
Part 2 of 2 for CAM-SIMA. Workaround for a bug in GNU Fortran >= 12. This is perhaps the manifestation of GCC Bugzilla Bug 100819. When a character string array is passed as the actual argument to an unlimited polymorphic dummy argument, its array index and length parameter are mishandled.
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mwaxmonsky
approved these changes
Feb 28, 2025
| -DCMAKE_PREFIX_PATH=/home/runner/work/CAM-SIMA/CAM-SIMA/pFUnit/build/installed \ | ||
| -DCMAKE_PREFIX_PATH=$GITHUB_WORKSPACE/pFUnit/build/installed \ |
nusbaume
requested changes
Mar 4, 2025
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Thanks for the fix @kuanchihwang! My only request is to, at least for now, revert back to the len=* syntax in the pFUnit code, as that matches much of the rest of CAM-SIMA and atmospheric_physics (although long-term I am happy to have more discussion on what the ideal Fortran style should be for SIMA as whole).
nusbaume
approved these changes
Mar 4, 2025
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Everything looks great to me now. Thanks again @kuanchihwang!
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@kuanchihwang Also feel free to merge this in whenever you are ready, as it would probably be best for this PR to come in next. Thanks! |
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Tag name (required for release branches):
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Originator(s):
kuanchihwang
Descriptions (include the issue title, and the keyword ['closes', 'fixes', 'resolves'] followed by the issue number):
The
stringifyutility function uses an advanced Fortran language feature: Polymorphism. Unfortunately, recent GNU Fortran versions (>= 12) have problems with it. When a character string array is passed as the actual argument to an unlimited polymorphic dummy argument, its array index and length parameter are mishandled.This compiler bug is perhaps the manifestation of GCC Bugzilla Bug 100819. A workaround, which is implemented by this PR, is to use a temporary character string array. As a result, the unit tests no longer need to be guarded by the
__GNUC__macro.Additionally, this PR also harmonizes the code style in unit tests.
Describe any changes made to the build system:
None
Describe any changes made to the namelist:
None
List any changes to the defaults for the input datasets (e.g., boundary datasets):
None
List all files eliminated and why:
None
List all files added and what they do:
None
List all existing files that have been modified, and describe the changes:
M .github/workflows/fortran_unit_tests.ymlM src/core_utils/string_core_utils.F90M src/dynamics/mpas/driver/dyn_mpas_subdriver.F90M test/unit/fortran/src/core_utils/test_string_core_utils.pfRegression tests:
No changes to any existing tests with respect to the last baseline,
sima0_03_000.