From 655f4fc9f27d19bb02eb6f131412f88db42f4253 Mon Sep 17 00:00:00 2001
From: ruki <waruqi@gmail.com>
Date: Tue, 19 Apr 2016 14:33:09 +0800
Subject: check ar and swiftc

---
 xmake/core/tool/tool.lua | 2 +-
 xmake/tools/ar.lua       | 5 ++++-
 xmake/tools/swiftc.lua   | 7 +++++++
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/xmake/core/tool/tool.lua b/xmake/core/tool/tool.lua
index c885f9e48..a6d077de5 100644
--- a/xmake/core/tool/tool.lua
+++ b/xmake/core/tool/tool.lua
@@ -212,7 +212,7 @@ function tool.check(shellname, dirs)
 
     -- check
     assert(shellname)
-    
+
     -- attempt to check it directly first
     if tool._check(shellname) then
         return shellname
diff --git a/xmake/tools/ar.lua b/xmake/tools/ar.lua
index 0999672f1..9aaf70b80 100644
--- a/xmake/tools/ar.lua
+++ b/xmake/tools/ar.lua
@@ -68,5 +68,8 @@ end
 function check(flags)
 
     -- check it
-    os.run("%s %s", _g.shellname, ifelse(flags, flags, ""))
+    local ok = os.execute("%s %s > %s 2>&1", _g.shellname, ifelse(flags, flags, ""), os.nuldev())
+    if ok ~= 0 and ok ~= 256 then
+        raise("not found!")
+    end
 end
diff --git a/xmake/tools/swiftc.lua b/xmake/tools/swiftc.lua
index 65e6f8245..2cfc94cc0 100644
--- a/xmake/tools/swiftc.lua
+++ b/xmake/tools/swiftc.lua
@@ -110,3 +110,10 @@ function run(...)
     os.run(...)
 end
 
+-- check the given flags 
+function check(flags)
+
+    -- check it
+    os.run("%s -h", _g.shellname)
+
+end
-- 
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