diff --git a/cmake/script/bitcode_to_elfobj b/cmake/script/bitcode_to_elfobj
index a5886e627..c71aa1198 100755
--- a/cmake/script/bitcode_to_elfobj
+++ b/cmake/script/bitcode_to_elfobj
@@ -69,18 +69,13 @@ def shell_run_command(command_str, need_print_all=True, need_print_output=True,
                           stdout=subprocess.PIPE,
                           stderr=subprocess.STDOUT,
                           shell=True,
-                          close_fds=True)
+                          close_fds=True,
+                          universal_newlines=True)
     while True:
         data = ps.stdout.readline()
-        if data == b'':
+        if not data:
             if ps.poll() is not None:
                 break
-        # fix: python2->python3 subprocess shell bug
-        # 2023/09/21 jiangxf
-        try:
-            data = data.decode()
-        except:
-            pass
         result["return_message"].append(data)
 
         if not need_print_all: