check the file mtime

1 files changed, 25 insertions, 24 deletions

diff --git a/xmake/actions/build/builder.lua b/xmake/actions/build/builder.lua
index 2ad474934..e9880eead 100755
--- a/xmake/actions/build/builder.lua
+++ b/xmake/actions/build/builder.lua
@@ -25,10 +25,10 @@ import("core.base.option")
 import("core.project.task")
 import("core.project.config")
 import("core.project.project")
-import("core.project.cache")
 import("core.tool.tool")
 import("core.tool.linker")
 import("core.tool.compiler")
+import("core.project.cache")
 import("core.platform.environment")
 
 -- build the object for the *.[o|obj] source file
@@ -56,6 +56,11 @@ function _build_object(target, index)
     local sourcefile = sourcefiles[index]
     local objectfile = objectfiles[index]
 
+    -- we need not rebuild it if the files are not modified 
+    if os.mtime(sourcefile) < os.mtime(objectfile) then
+        return 
+    end
+
     -- get the source file type
     local filetype = path.extension(sourcefile):lower()
 
@@ -149,18 +154,31 @@ end
 -- build the given target
 function _build_target(target)
 
-    -- trace
-    print("[%02d%%]: building.$(mode) %s", _g.targetindex * 100 / _g.targetcount, target:name())
-
     -- build objects
     _build_objects(target)
 
+    -- make headers
+    local srcheaders, dstheaders = target:headerfiles()
+    if srcheaders and dstheaders then
+        local i = 1
+        for _, srcheader in ipairs(srcheaders) do
+            local dstheader = dstheaders[i]
+            if dstheader then
+                os.cp(srcheader, dstheader)
+            end
+            i = i + 1
+        end
+    end
+
+    -- update target index
+    _g.targetindex = _g.targetindex + 1
+
     -- make the command for linking target
     local targetfile    = target:targetfile()
     local command       = linker.command(target)
 
     -- trace
-    print("[%02d%%]: linking.$(mode) %s", (_g.targetindex + 1) * 100 / _g.targetcount, path.filename(targetfile))
+    print("[%02d%%]: linking.$(mode) %s", _g.targetindex * 100 / _g.targetcount, path.filename(targetfile))
 
     -- trace verbose info
     if option.get("verbose") then
@@ -172,22 +190,6 @@ function _build_target(target)
 
     -- run command
     os.run(command)
-
-    -- make headers
-    local srcheaders, dstheaders = target:headerfiles()
-    if srcheaders and dstheaders then
-        local i = 1
-        for _, srcheader in ipairs(srcheaders) do
-            local dstheader = dstheaders[i]
-            if dstheader then
-                os.cp(srcheader, dstheader)
-            end
-            i = i + 1
-        end
-    end
-
-    -- update target index
-    _g.targetindex = _g.targetindex + 1
 end
 
 -- make the given target 
@@ -205,7 +207,7 @@ function _make_target(target)
     for i = 1, 3 do
         local script = scripts[i]
         if script ~= nil then
-            script(target)
+            return script(target)
         end
     end
 end
@@ -220,7 +222,7 @@ function _make_target_and_deps(target)
 
     -- make for all dependent targets
     for _, depname in ipairs(target:get("deps")) do
-        _make_target_and_deps(project.target(depname))
+        _make_target_and_deps(project.target(depname)) 
     end
 
     -- make target
@@ -230,7 +232,6 @@ function _make_target_and_deps(target)
     _g.finished[target:name()] = true
 end
 
-
 -- stats the given target and deps
 function _stat_target_count_and_deps(target)