fix[cartesian]: Deactivate K offset write in gt:gpu (#1755)

Following the issue logged as
#1754 we are deactivating the
K-offset write feature until we can figure out why it's failing.

I will monitor any activity on the ticket if users are hit by this.

---------

Co-authored-by: Hannes Vogt <[email protected]>

src/gt4py/cartesian/frontend/gtscript_frontend.py

@@ -1460,6 +1460,13 @@ def visit_Assign(self, node: ast.Assign) -> list:
                                 loc=nodes.Location.from_ast_node(t),
                             )
 
+                    if self.backend_name in ["gt:gpu"]:
+                        raise GTScriptSyntaxError(
+                            message=f"Assignment to non-zero offsets in K is not available in {self.backend_name} as an unsolved bug remains."
+                            "Please refer to https://github.com/GridTools/gt4py/issues/1754.",
+                            loc=nodes.Location.from_ast_node(t),
+                        )
+
             if not self._is_known(name):
                 if name in self.temp_decls:
                     field_decl = self.temp_decls[name]

tests/cartesian_tests/integration_tests/multi_feature_tests/test_code_generation.py

@@ -667,6 +667,10 @@ def test_K_offset_write_conditional(backend):
             pytest.skip(
                 f"{backend} backend with CUDA 11 and/or GCC 10.3 is not capable of K offset write, update CUDA/GCC if possible"
             )
+    if backend in ["gt:gpu"]:
+        pytest.skip(
+            f"{backend} backend is not capable of K offset write, bug remains unsolved: https://github.com/GridTools/gt4py/issues/1754"
+        )
 
     arraylib = get_array_library(backend)
     array_shape = (1, 1, 4)