Assume current version of Flang for CMake < 3.24

Author: Meinersbur

flang-rt/CMakeLists.txt

@@ -26,7 +26,7 @@ if (CMAKE_VERSION VERSION_LESS "3.24")
     CMAKE_FORCE_Fortran_COMPILER("${CMAKE_Fortran_COMPILER}" "LLVMFlang")
 
     set(CMAKE_Fortran_COMPILER_ID "LLVMFlang")
-    set(CMAKE_Fortran_COMPILER_VERSION "20.0")
+    set(CMAKE_Fortran_COMPILER_VERSION "${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}")
 
     set(CMAKE_Fortran_SUBMODULE_SEP "-")
     set(CMAKE_Fortran_SUBMODULE_EXT ".mod")