From 21823652b9c8a7fece9a00c0b8659c8a19b1c00f Mon Sep 17 00:00:00 2001
From: ruki <waruqi@gmail.com>
Date: Wed, 27 Jul 2022 22:30:48 +0800
Subject: improve has_tool

---
 xmake/core/package/package.lua | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/xmake/core/package/package.lua b/xmake/core/package/package.lua
index 94dd88b61..11db68e0d 100644
--- a/xmake/core/package/package.lua
+++ b/xmake/core/package/package.lua
@@ -993,9 +993,11 @@ end
 -- end
 function _instance:has_tool(toolkind, ...)
     local _, toolname = self:tool(toolkind)
-    for _, v in ipairs(table.join(...)) do
-        if v and toolname:find("^" .. v:gsub("%-", "%%-") .. "$") then
-            return true
+    if toolname then
+        for _, v in ipairs(table.join(...)) do
+            if v and toolname:find("^" .. v:gsub("%-", "%%-") .. "$") then
+                return true
+            end
         end
     end
 end
-- 
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