LLVMFlang: Missing support for targeting MSVC ABI on Windows

Hi, I am trying to compile a very simple Fortran program using CMake and LLVM 16.0's flang-new for Windows on Arm and I am seeing the following behaviour.

Using the following Fortran source code

program hello
    implicit none
    write(*,*) 'Hello world!'
  end program hello

and the following CMakeLists.txt

enable_language (Fortran)
project(helloworld Fortran)
add_executable(hello test.f)

with the following command line cmake -G Ninja -DCMAKE_Fortran_COMPILER=FLANG-NEW -DCMAKE_Fortran_COMPILER_FORCED=1 -DCMAKE_Fortran_FLAGS="-flang-experimental-exec" ..

And it generates this rule

#############################################
# Rule for linking Fortran executable.

rule Fortran_EXECUTABLE_LINKER__hello_
  command = cmd.exe /C "$PRE_LINK && C:\PROGRA~1\LLVM\bin\FLANG-~1.EXE $FLAGS $LINK_FLAGS $in -o $TARGET_FILE -Wl,--out-implib,$TARGET_IMPLIB -Wl,--major-image-version,0,--minor-image-version,0 $LINK_PATH $LINK_LIBRARIES && $POST_BUILD"
  description = Linking Fortran executable $TARGET_FILE
  restat = $RESTAT

Which is an incorret rule. I just noticed that this might be the reason why I need to use CMAKE_Fortran_COMPILER_FORCED because if I don’t I see a similar thing

-- Check for working Fortran compiler: C:/Program Files/LLVM/bin/flang-new.exe - broken
CMake Error at C:/Users/everton/CMake/share/cmake-3.26/Modules/CMakeTestFortranCompiler.cmake:59 (message):
  The Fortran compiler

    "C:/Program Files/LLVM/bin/flang-new.exe"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: C:/Users/everton/source/repos/OpenBLAS/build3/out/CMakeFiles/CMakeScratch/TryCompile-1so3bv

    Run Build Command(s):C:/PROGRA~1/MICROS~1/2022/COMMUN~1/Common7/IDE/COMMON~1/MICROS~1/CMake/Ninja/ninja.exe -v cmTC_5c4f4 && [1/4] cmd.exe /C "C:\PROGRA~1\LLVM\bin\FLANG-~1.EXE -cpp   -flang-experimental-exec -E C:\Users\everton\source\repos\OpenBLAS\build3\out\CMakeFiles\CMakeScratch\TryCompile-1so3bv\testFortranCompiler.f > CMakeFiles\cmTC_5c4f4.dir\testFortranCompiler.f-pp.f && C:\Users\everton\CMake\bin\cmake.exe -E cmake_ninja_depends --tdi=CMakeFiles\cmTC_5c4f4.dir\FortranDependInfo.json --lang=Fortran --pp=CMakeFiles\cmTC_5c4f4.dir\testFortranCompiler.f-pp.f --dep=CMakeFiles\cmTC_5c4f4.dir\testFortranCompiler.f-pp.f.d --obj=CMakeFiles\cmTC_5c4f4.dir\testFortranCompiler.f.obj --ddi=CMakeFiles\cmTC_5c4f4.dir\testFortranCompiler.f.obj.ddi"
    flang-new: warning: argument unused during compilation: '-flang-experimental-exec'
    [2/4] C:\Users\everton\CMake\bin\cmake.exe -E cmake_ninja_dyndep --tdi=CMakeFiles\cmTC_5c4f4.dir\FortranDependInfo.json --lang=Fortran --dd=CMakeFiles\cmTC_5c4f4.dir\Fortran.dd @CMakeFiles\cmTC_5c4f4.dir\Fortran.dd.rsp
    [3/4] C:\PROGRA~1\LLVM\bin\FLANG-~1.EXE -IC:\Users\everton\source\repos\OpenBLAS\build3\out\CMakeFiles\CMakeScratch\TryCompile-1so3bv -flang-experimental-exec  -ffixed-line-length-72 -c CMakeFiles\cmTC_5c4f4.dir\testFortranCompiler.f-pp.f -o CMakeFiles\cmTC_5c4f4.dir\testFortranCompiler.f.obj
    FLANG-~1: warning: argument unused during compilation: '-flang-experimental-exec'
    [4/4] cmd.exe /C "cd . && C:\PROGRA~1\LLVM\bin\FLANG-~1.EXE -flang-experimental-exec  CMakeFiles\cmTC_5c4f4.dir\testFortranCompiler.f.obj -o cmTC_5c4f4.exe -Wl,--out-implib,libcmTC_5c4f4.dll.a -Wl,--major-image-version,0,--minor-image-version,0   && cd ."
    FAILED: cmTC_5c4f4.exe
    cmd.exe /C "cd . && C:\PROGRA~1\LLVM\bin\FLANG-~1.EXE -flang-experimental-exec  CMakeFiles\cmTC_5c4f4.dir\testFortranCompiler.f.obj -o cmTC_5c4f4.exe -Wl,--out-implib,libcmTC_5c4f4.dll.a -Wl,--major-image-version,0,--minor-image-version,0   && cd ."
    lld-link: warning: ignoring unknown argument '--out-implib'    
    lld-link: warning: ignoring unknown argument '--major-image-version'
    lld-link: warning: ignoring unknown argument '--minor-image-version'
    lld-link: error: could not open 'libcmTC_5c4f4.dll.a': no such file or directory
    lld-link: error: could not open '0': no such file or directory 
    lld-link: error: could not open '0': no such file or directory 
    flang-new: error: linker command failed with exit code 1 (use -v to see invocation)
    ninja: build stopped: subcommand failed.





  CMake will not be able to correctly generate this project.       
Call Stack (most recent call first):
  CMakeLists.txt:2 (enable_language)

My CMake is version 3.26.1 on a SurfaceX machine.