Enable LTO if available

CMakeLists.txt

@@ -11,6 +11,12 @@ include(identity)
 
 project(${PROJECT_NAME} VERSION ${PROJECT_VERSION} LANGUAGES C)
 
+include(CheckIPOSupported)
+check_ipo_supported(RESULT IPO_SUPPORTED)
+if(IPO_SUPPORTED)
+    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+endif()
+
 option(BUILD_SERVER "Build dedicated server" ON)
 option(BUILD_CLIENT "Build client" ON)
 option(BUILD_RENDERER_GL1 "Build GL1 renderer" ON)

cmake/platforms/emscripten.cmake

@@ -15,6 +15,9 @@ set(USE_OPENAL_DLOPEN OFF CACHE INTERNAL "")
 set(BUILD_GAME_LIBRARIES OFF CACHE INTERNAL "")
 set(USE_HTTP OFF CACHE INTERNAL "")
 
+# Disable LTO since the libraries Emscripten provides aren't LTO enabled
+set(CMAKE_INTERPROCEDURAL_OPTIMIZATION FALSE)
+
 list(APPEND CLIENT_LINK_OPTIONS
     -sTOTAL_MEMORY=256MB
     -sSTACK_SIZE=5MB