improve path and moc rule #3457

2 files changed, 10 insertions, 3 deletions

diff --git a/xmake/core/base/path.lua b/xmake/core/base/path.lua
index bd0701702..59c891a3c 100644
--- a/xmake/core/base/path.lua
+++ b/xmake/core/base/path.lua
@@ -65,6 +65,11 @@ function _instance:set(p)
     return self
 end
 
+function _instance:empty()
+    local str = self._STR
+    return str == nil or #str == 0
+end
+
 function _instance:transform_set(transform)
     self._TRANSFORM = transform
     self:_update()
@@ -138,12 +143,12 @@ end
 
 -- tostring(path)
 function _instance:__tostring()
-    return self:str()
+    return not self:empty() and self:str() or ""
 end
 
 -- todisplay(path)
 function _instance:__todisplay()
-    return "<path: " .. self:str() .. ">"
+    return "<path: " .. (self:empty() and "empty" or self:str()) .. ">"
 end
 
 -- path.translate:
diff --git a/xmake/rules/qt/moc/xmake.lua b/xmake/rules/qt/moc/xmake.lua
index d520596b6..6290e6395 100644
--- a/xmake/rules/qt/moc/xmake.lua
+++ b/xmake/rules/qt/moc/xmake.lua
@@ -76,7 +76,9 @@ rule("qt.moc")
                     end
                     return item
                 end)
-                table.insert(flags, pathitem)
+                if not pathitem:empty() then
+                    table.insert(flags, pathitem)
+                end
             end
         end
         local user_flags = target:get("qt.moc.flags") or {}