From c7c83a35fa74b419145f2e5013873bf98bf46df5 Mon Sep 17 00:00:00 2001
From: Philipp David <pd@3b.pm>
Date: Sat, 19 Mar 2022 18:08:28 +0100
Subject: Enable LTO/IPO on release builds

---
 CMakeLists.txt | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'CMakeLists.txt')

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7537703c..889d6fc4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.9.4)
 
 if(WIN32)
     # In Qt 5.1+ we have our own main() function, don't autolink to qtmain on Windows
@@ -43,6 +43,18 @@ set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Werror=return-type")
 # Fix build with Qt 5.13
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DQT_NO_DEPRECATED_WARNINGS=Y")
 
+include(CheckIPOSupported)
+check_ipo_supported(RESULT ipo_supported OUTPUT ipo_error)
+
+if(ipo_supported AND (CMAKE_BUILD_TYPE STREQUAL "Release" OR CMAKE_BUILD_TYPE STREQUAL "MinSizeRel"))
+    message(STATUS "IPO / LTO enabled")
+    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+elseif(ipo_supported)
+    message(STATUS "Not enabling IPO / LTO on debug builds")
+else()
+    message(STATUS "IPO / LTO not supported: <${ipo_error}>")
+endif()
+
 ##################################### Set Application options #####################################
 
 ######## Set URLs ########
-- 
cgit