From 468d1e8c7aa638ccca9d8dc3e38a85cf5f99005c Mon Sep 17 00:00:00 2001
From: owent <owentou@tencent.com>
Date: Mon, 25 Nov 2024 11:41:55 +0800
Subject: [PATCH 1/2] Upgrade cmake

Downgrade cmake minimal requirement

Add some policy settings to cmake
---
 CMakeLists.txt | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 177296d81c..8e8f58e19b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,23 +1,38 @@
 # Copyright The OpenTelemetry Authors
 # SPDX-License-Identifier: Apache-2.0
 
-cmake_minimum_required(VERSION 3.9)
+cmake_minimum_required(VERSION 3.10)
 
-# See https://cmake.org/cmake/help/v3.3/policy/CMP0057.html required by certain
-# versions of gtest
+# These policies belowed are used to keep a more strick behavior of cmake
+cmake_policy(SET CMP0054 NEW)
+cmake_policy(SET CMP0067 NEW)
+
+# See https://cmake.org/cmake/help/latest/policy/CMP0057.html required by
+# certain versions of gtest
 cmake_policy(SET CMP0057 NEW)
 
-# See https://cmake.org/cmake/help/v3.12/policy/CMP0074.html required by certain
-# version of zlib which CURL depends on.
+# See https://cmake.org/cmake/help/latest/policy/CMP0074.html required by
+# certain version of zlib which CURL depends on.
 if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.12")
   cmake_policy(SET CMP0074 NEW)
 endif()
 
+# Allow to use normal variable for option()
+if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.13")
+  cmake_policy(SET CMP0077 NEW)
+endif()
+
 # Prefer CMAKE_MSVC_RUNTIME_LIBRARY if possible
 if(POLICY CMP0091)
   cmake_policy(SET CMP0091 NEW)
 endif()
 
+# MSVC RTTI flag /GR should not be not added to CMAKE_CXX_FLAGS by default. @see
+# https://cmake.org/cmake/help/latest/policy/CMP0117.html
+if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.20.0")
+  cmake_policy(SET CMP0117 NEW)
+endif()
+
 project(opentelemetry-cpp)
 
 # Mark variables as used so cmake doesn't complain about them

From 3f4c133c1b8a4b8786634ce77072b83136ba0b3b Mon Sep 17 00:00:00 2001
From: owent <owentou@tencent.com>
Date: Mon, 2 Dec 2024 11:22:39 +0800
Subject: [PATCH 2/2] cleanup cmake policies

---
 CMakeLists.txt | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8e8f58e19b..6abf96cd99 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,14 +3,6 @@
 
 cmake_minimum_required(VERSION 3.10)
 
-# These policies belowed are used to keep a more strick behavior of cmake
-cmake_policy(SET CMP0054 NEW)
-cmake_policy(SET CMP0067 NEW)
-
-# See https://cmake.org/cmake/help/latest/policy/CMP0057.html required by
-# certain versions of gtest
-cmake_policy(SET CMP0057 NEW)
-
 # See https://cmake.org/cmake/help/latest/policy/CMP0074.html required by
 # certain version of zlib which CURL depends on.
 if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.12")