clang-cl argument unknown -ftls-model=initial-exec

Question

The command:

clang-cl.exe -Wall -Wextra -ftls-model=initial-exec null.cpp

fails with the message:

clang-cl: warning: unknown argument ignored in clang-cl: '-ftls-model=initial-exec' [-Wunknown-argument]

The argument can be found here: https://clang.llvm.org/docs/CommandGuide/clang.html#cmdoption-ftls-model

*null.cpp is a empty file.

Running the command clang-cl.exe --version prints:

clang version 13.0.0
Target: i686-pc-windows-msvc
Thread model: posix
InstalledDir: C:\PROGRA~1\MICROS~3\2022\PREVIEW\VC\Tools\Llvm\bin

Is this argument not available when using clang-cl or when compiling on Windows?

*This argument is used when building mimalloc (Microsoft memory allocator) as a cmake dependecy using add_subdirectory(...).