Added out-of-date condition to link recipe

make.py

@@ -56,6 +56,12 @@ for source_file in source_files:
 
 def exe_not_exists():
     return not os.path.exists(EXE_NAME)
+    
+def old_exe():
+    object_files = [
+        os.path.realpath(path)
+        for path in glob('**/*.obj', recursive=True)]
+    return Sane.file_condition(object_files, [EXE_NAME])()
 
 @recipe(hook_deps=['obj_compile'],
         info='Compile the source files.')
@@ -63,7 +69,7 @@ def compile():
     pass
 
 @recipe(recipe_deps=[compile],
-        conditions=[exe_not_exists],
+        conditions=[exe_not_exists, old_exe],
         info='Links the main executable.')
 def link():
     obj_files = glob(os.path.join(OBJ_DIR, '**', '*.obj').replace('\\', '/'),