From de9601d8715b0e5a23f01e0c79e801859e6790df Mon Sep 17 00:00:00 2001
From: Marcel Jacobse <44684927+mjacobse@users.noreply.github.com>
Date: Thu, 7 Nov 2024 16:05:37 +0100
Subject: [PATCH] Allow old CMake versions without IPO support

---
 CMakeLists.txt | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1d4b65e..899d057 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,8 +21,10 @@ endif()
 if (${CMAKE_VERSION} VERSION_GREATER "3.15.0")
   cmake_policy(SET CMP0091 NEW)
 endif()
-cmake_policy(SET CMP0069 NEW) 
-set(CMAKE_POLICY_DEFAULT_CMP0069 NEW)
+if (NOT ${CMAKE_VERSION} VERSION_LESS "3.9.0")
+  cmake_policy(SET CMP0069 NEW)
+  set(CMAKE_POLICY_DEFAULT_CMP0069 NEW)
+endif()
 project(ASL)
 
 cmake_minimum_required(VERSION 3.0)
@@ -38,7 +40,11 @@ option(BUILD_DYNRT_LIBS "Build the libraries linked against the dynamic runtime
 option(BUILD_MT_LIBS "Build the multithreaded library" OFF)
 option(BUILD_CPP "Build the cpp interface" OFF)
 option(BUILD_F2C "Build the f2c library" OFF)
-option(USE_LTO "Use link time optimization" ON)
+if (${CMAKE_VERSION} VERSION_LESS "3.9.0")
+  option(USE_LTO "Use link time optimization" OFF)
+else()
+  option(USE_LTO "Use link time optimization" ON)
+endif()
 
 if(NOT BUILD_ASL_EXAMPLES)
   option(BUILD_ASL_EXAMPLES "Build the examples" OFF)