cmake: Enable LTO if compiler in build environment supports it

CMakeLists.txt

@@ -858,6 +858,16 @@ target_link_libraries(shadps4 PRIVATE Boost::headers GPUOpen::VulkanMemoryAlloca
 target_compile_definitions(shadps4 PRIVATE IMGUI_USER_CONFIG="imgui/imgui_config.h")
 target_compile_definitions(Dear_ImGui PRIVATE IMGUI_USER_CONFIG="${PROJECT_SOURCE_DIR}/src/imgui/imgui_config.h")
 
+# Enable link-time optimization if compiler in current environment supports it
+include(CheckIPOSupported)
+check_ipo_supported(RESULT ipo_supported)
+if(ipo_supported)
+  message(STATUS "IPO is supported")
+  set_property(TARGET shadps4 PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
+else()
+  message(WARNING "IPO is not supported")
+endif()
+
 if (APPLE)
   option(USE_SYSTEM_VULKAN_LOADER "Enables using the system Vulkan loader instead of directly linking with MoltenVK. Useful for loading validation layers." OFF)
   if (USE_SYSTEM_VULKAN_LOADER)