diff --git a/Modules/Compiler/LLVMFlang-Fortran.cmake b/Modules/Compiler/LLVMFlang-Fortran.cmake
index 7f43c18f31..914e40da7b 100644
--- a/Modules/Compiler/LLVMFlang-Fortran.cmake
+++ b/Modules/Compiler/LLVMFlang-Fortran.cmake
@@ -35,3 +35,16 @@ endif()
 
 set(CMAKE_SHARED_LIBRARY_Fortran_FLAGS -fPIC)
 set(CMAKE_SHARED_LIBRARY_CREATE_Fortran_FLAGS "-shared")
+
+# Determine LTO support
+set(_CMAKE_Fortran_IPO_SUPPORTED_BY_CMAKE NO)
+set(_CMAKE_Fortran_IPO_MAY_BE_SUPPORTED_BY_COMPILER NO)
+if(CMAKE_Fortran_COMPILER_VERSION VERSION_GREATER_EQUAL 18.0)
+  set(_CMAKE_Fortran_IPO_SUPPORTED_BY_CMAKE YES)
+  set(_CMAKE_Fortran_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES)
+  if(CMAKE_Fortran_COMPILER_VERSION VERSION_LESS 23.0)
+    set(CMAKE_Fortran_COMPILE_OPTIONS_IPO "-flto")
+  else()
+    set(CMAKE_Fortran_COMPILE_OPTIONS_IPO "-flto=thin")
+  endif()
+endif()