From 83dfac6a2e465ad26b6515d40786add2ba511663 Mon Sep 17 00:00:00 2001
From: Ian McCulloch <ian@qusim.net>
Date: Thu, 28 Nov 2024 19:37:31 +0800
Subject: [PATCH] Add CMAKE_INTERPROCEDURAL_OPTIMIZATION

The linker is using link time optimizations anyway; this adds -flto=auto which enables parallel link-time optimization
---
 CMakeLists.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bf7e0055..64a685da 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -96,6 +96,9 @@ option(DEV_MODE "Build testing dev_test.cpp with cytnx" OFF)
 # #####################################################################
 project(CYTNX VERSION ${CYTNX_VERSION} LANGUAGES CXX C)
 
+# C++ uses link-time optimization anyway; this enables additionally -flto=auto, for parallel compilation
+set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+
 add_library(cytnx STATIC)
 set_property(TARGET cytnx PROPERTY C_VISIBILITY_PRESET hidden)
 set_property(TARGET cytnx PROPERTY VISIBILITY_INLINES_HIDDEN ON)