fixes

source/cell.c

@@ -13,6 +13,7 @@
 
 #define BOOTSTRAP_MCODE      "boot/bootstrap.cm.mcode"
 #define ENGINE_SRC           "internal/engine.cm"
+#define ENGINE_CACHE_VERSION "engine-cache-v2"
 #define CELL_SHOP_DIR ".cell"
 #define CELL_CORE_DIR "packages/core"
 
@@ -222,7 +223,18 @@ static char *try_engine_cache(size_t *out_size) {
   char *src = load_core_file(ENGINE_SRC, &src_size);
   if (!src) return NULL;
 
-  char *hex = compute_blake2_hex(src, src_size);
+  size_t ver_len = strlen(ENGINE_CACHE_VERSION);
+  size_t salted_size = src_size + 1 + ver_len;
+  char *salted = malloc(salted_size);
+  if (!salted) {
+    free(src);
+    return NULL;
+  }
+  memcpy(salted, src, src_size);
+  salted[src_size] = '\n';
+  memcpy(salted + src_size + 1, ENGINE_CACHE_VERSION, ver_len);
+  char *hex = compute_blake2_hex(salted, salted_size);
+  free(salted);
   free(src);
   if (!hex) return NULL;
   char *cpath = build_cache_path(hex);