adds a workaround for NVHPC 24.3+ in a test program

tests/core/test_interpolation_exchange.c

@@ -82,13 +82,26 @@ int main(void) {
   xt_idxlist_delete(tgt_idxlist);
   xt_idxlist_delete(src_idxlist);
 
+  struct yac_interpolation_exchange * exchanges[] = {exchange, exchange_copy};
+  enum {NUM_EXCH = sizeof(exchanges) / sizeof(exchanges[0])};
+
   for (int optional_put_get = 0; optional_put_get < 2; ++optional_put_get) {
-    check_exchange(exchange, is_source, is_target, optional_put_get);
-    check_exchange(exchange_copy, is_source, is_target, optional_put_get);
+
+// #define NVHPC_BUG
+// Starting version 24.3, NVHPC generates invalid code here
+#ifdef NVHPC_BUG
+    check_exchange(exchanges[0], is_source, is_target, optional_put_get);
+    check_exchange(exchanges[1], is_source, is_target, optional_put_get);
+#else
+    for (size_t exch_idx = 0; exch_idx < NUM_EXCH; ++exch_idx)
+      check_exchange(
+        exchanges[exch_idx], is_source, is_target, optional_put_get);
+#endif
   }
 
-  yac_interpolation_exchange_delete(exchange, "main cleanup");
-  yac_interpolation_exchange_delete(exchange_copy, "main cleanup");
+  for (size_t exch_idx = 0; exch_idx < NUM_EXCH; ++exch_idx)
+    yac_interpolation_exchange_delete(exchanges[exch_idx], "main cleanup");
+
 
   xt_finalize();
   MPI_Finalize();