cutils: csample: add support for NumPy 2.0

pasp/csample.c

@@ -35,7 +35,7 @@ bool atoms2symbols(PyArrayObject *atoms, sample_storage_t S[NUM_PROCS], size_t n
   /* Number of elements in atoms. */
   size_t n = PyArray_SIZE(atoms);
   /* Number of bytes in a (possibly wide) character. */
-  size_t a = PyArray_DESCR(atoms)->alignment;
+  size_t a = PyDataType_ALIGNMENT(PyArray_DESCR(atoms));
   /* Number of bytes in one (possibly wide) string. */
   size_t b = PyArray_ITEMSIZE(atoms);
   clingo_symbol_t *A = NULL;

pasp/cutils.c

@@ -171,3 +171,9 @@ void raise_clingo_error(const char *msg) {
   } else sprintf(buffer, "Clingo error %d: %s\n", clingo_error_code(), clingo_error_message());
   PyErr_SetString(PyExc_Exception, buffer);
 }
+
+// NumPy 1.* -> 2.* migration requires this definition.
+// See https://numpy.org/devdocs/numpy_2_0_migration_guide.html for more information.
+#if NPY_ABI_VERSION < 0x02000000
+  #define PyDataType_ALIGNMENT(descr) ((descr)->alignment)
+#endif