Fix warnings related to undefined defines and implicit casts

src/buffer.c

@@ -1,4 +1,5 @@
 #include <bh/internal/buffer.h>
+#include <bh/internal/io.h>
 #include <stdlib.h>
 #include <string.h>
 

src/hashmap.c

@@ -112,7 +112,7 @@ int bh_hashmap_reserve(bh_hashmap_t *hashmap,
 
     /* Calculate hashmap max capacity and capacity threshold */
     capacity = hashmap->capacity;
-    threshold = hashmap->capacity * hashmap->factor;
+    threshold = (size_t)(hashmap->capacity * hashmap->factor);
     max_capacity = ((size_t)-1) / sizeof(bh_hashmap_node_t);
 
     /* New capacity can't be smaller then current hashmap size */
@@ -132,7 +132,7 @@ int bh_hashmap_reserve(bh_hashmap_t *hashmap,
         while (size > threshold)
         {
             capacity = (capacity) ? (capacity * 2) : (16);
-            threshold = capacity * hashmap->factor;
+            threshold = (size_t)(capacity * hashmap->factor);
 
             /* Capacity can't be bigger than max capacity and overflow */
             if (capacity > max_capacity || capacity < 16)
@@ -145,7 +145,7 @@ int bh_hashmap_reserve(bh_hashmap_t *hashmap,
         while (size <= threshold / 2 && capacity > 16)
         {
             capacity /= 2;
-            threshold = capacity * hashmap->factor;
+            threshold = (size_t)(capacity * hashmap->factor);
         }
     }
 
@@ -380,7 +380,7 @@ void bh_hashmap_set_factor(bh_hashmap_t *hashmap,
 
     /* Calculate new threshold value */
     hashmap->factor = factor;
-    hashmap->threshold = hashmap->capacity * factor;
+    hashmap->threshold = (size_t)(hashmap->capacity * factor);
 }
 
 /**

src/thread.c

@@ -220,9 +220,6 @@ void bh_cond_free(bh_cond_t *cond)
 int bh_thread_pool_add(bh_thread_pool_t *pool,
                        bh_task_t *task)
 {
-    void *iter;
-    bh_task_t *item;
-
     /* Queue task for execution */
     bh_mutex_lock(&pool->lock);
     if (bh_queue_insert(&pool->tasks, task))