diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5cc8687..bdfbae5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -77,7 +77,10 @@ elseif(${IS_CLANG})
     if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS ${MINIMAL_CLANG})
         message(FATAL_ERROR "Clang ${MINIMAL_CLANG} or higher is required.")
     endif()
-    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -flto=full -fwhole-program-vtables -fstrict-vtable-pointers")
+    if (${CMAKE_INTERPROCEDURAL_OPTIMIZATION_RELEASE} OR MINGW) # CMAKE_INTERPROCEDURAL_OPTIMIZATION_RELEASE is false on llvm-mingw toolchains even though it is supported
+        set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -flto=full -fwhole-program-vtables")
+    endif()
+    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -fstrict-vtable-pointers")
 endif()
 string(TOUPPER ${CMAKE_BUILD_TYPE} UPPERCASE_BUILD_TYPE)
 if (UPPERCASE_BUILD_TYPE STREQUAL RELEASE)