From 0d25d55a865e3ff53a65028e0ee44ddd54abf4d9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=9F=B3=E6=99=93=E4=BC=9F?=
 <39303645+Shixiaowei02@users.noreply.github.com>
Date: Wed, 4 Nov 2020 17:11:51 +0800
Subject: [PATCH] update the cmake cmd, test=develop (#28344)

---
 cmake/external/pybind11.cmake | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cmake/external/pybind11.cmake b/cmake/external/pybind11.cmake
index 05cc77f23b..353cb5c72f 100644
--- a/cmake/external/pybind11.cmake
+++ b/cmake/external/pybind11.cmake
@@ -34,6 +34,11 @@ ExternalProject_Add(
         "${PYBIND_DOWNLOAD_CMD}"
         PREFIX            ${PYBIND_PREFIX_DIR}
         SOURCE_DIR        ${PYBIND_SOURCE_DIR}
+        # If we explicitly leave the `UPDATE_COMMAND` of the ExternalProject_Add
+        # function in CMakeLists blank, it will cause another parameter GIT_TAG
+        # to be modified without triggering incremental compilation, and the
+        # third-party library version changes cannot be incorporated.
+        # reference: https://cmake.org/cmake/help/latest/module/ExternalProject.html
         UPDATE_COMMAND    ""
         CONFIGURE_COMMAND ""
         BUILD_COMMAND     ""
-- 
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