From 89d101550dbb88230807b5a8408ec1c134f053a4 Mon Sep 17 00:00:00 2001
From: Joel Winarske <joel.winarske@gmail.com>
Date: Sat, 1 Oct 2022 09:23:35 -0700
Subject: [PATCH] IPO support

- When BUILD_SHARED_LIBS=ON and CMake version >= 3.9 use IPO

Signed-off-by: Joel Winarske <joel.winarske@gmail.com>
---
 src/CMakeLists.txt | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 01f191c9..6ca0b268 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -398,3 +398,16 @@ if (GLFW_INSTALL)
             LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")
 endif()
 
+#--------------------------------------------------------------------
+# Link Time Optimization
+#--------------------------------------------------------------------
+if (BUILD_SHARED_LIBS AND ${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.9.0")
+    include(CheckIPOSupported)
+    check_ipo_supported(RESULT result OUTPUT output)
+    if(result)
+        message(STATUS "glfw: Using IPO")
+        set_property(TARGET glfw PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
+    else()
+        message(WARNING "IPO is not supported: ${output}")
+    endif ()
+endif ()