Building split debug info files on Windows with the GNU ABI

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Hello, I'm trying to build split debug info files on Windows, using the Nightly compiler. On MSVC (nightly-x86_64-pc-windows-msvc) the pdb file gets generated and everything is good. However on GNU (nightly-x86_64-pc-windows-gnu), even with [profile.dev] split-debuginfo = "packed" set the DWARF file doesn't get generated in the target/debug directory.

I'm trying to use GNU instead of MSVC because I'm using CodeLLDB on VSCode and it says in its docs that GNU is preferred: Windows · vadimcn/codelldb Wiki · GitHub (on MSVC I'm having some issues debugging such as the debugger timing out). And I need the split debug info files because the LLDB is complaining that they're missing:

(in the debug console)
warning: (x86_64) [executable].exe unable to locate separate debug file (dwo, dwp). Debugging will be degraded.

After running cargo build --verbose I've noticed that cargo invokes rustc without setting the split-debuginfo flag. And when I'm passing setting the RUSTFLAGS manually to set RUSTFLAGS=-C split-debuginfo=packed it says error: `-Csplit-debuginfo=packed` is unstable on this platform. Is there a way to enable this unstable option? Or maybe just a better way to debug Rust programs on Windows?

cargo check output 
>cargo check 
error: failed to run `rustc` to learn about target-specific information

Caused by:
  process didn't exit successfully: `C:\Users\Bubilda\.rustup\toolchains\nightly-x86_64-pc-windows-gnu\bin\rustc.exe - --crate-name ___ --print=file-names -C split-debuginfo=packed --crate-type 
bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type 
proc-macro --print=sysroot --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit code: 1)
  --- stdout
  ___.exe
  lib___.rlib
  ___.dll
  ___.dll
  lib___.a
  ___.dll
  C:\Users\Bubilda\.rustup\toolchains\nightly-x86_64-pc-windows-gnu
  off
  ___
  debug_assertions
  fmt_debug="full"
  overflow_checks
  panic="unwind"
  proc_macro
  relocation_model="pic"
  target_abi=""
  target_arch="x86_64"
  target_endian="little"
  target_env="gnu"
  target_family="windows"
  target_feature="cmpxchg16b"
  target_feature="fxsr"
  target_feature="lahfsahf"
  target_feature="sse"
  target_feature="sse2"
  target_feature="sse3"
  target_feature="x87"
  target_has_atomic
  target_has_atomic="128"
  target_has_atomic="16"
  target_has_atomic="32"
  target_has_atomic="64"
  target_has_atomic="8"
  target_has_atomic="ptr"
  target_has_atomic_equal_alignment="128"
  target_has_atomic_equal_alignment="16"
  target_has_atomic_equal_alignment="32"
  target_has_atomic_equal_alignment="64"
  target_has_atomic_equal_alignment="8"
  target_has_atomic_equal_alignment="ptr"
  target_has_atomic_load_store
  target_has_atomic_load_store="128"
  target_has_atomic_load_store="16"
  target_has_atomic_load_store="32"
  target_has_atomic_load_store="64"
  target_has_atomic_load_store="8"
  target_has_atomic_load_store="ptr"
  target_os="windows"
  target_pointer_width="64"
  target_vendor="pc"
  ub_checks
  windows

  --- stderr
  error: `-Csplit-debuginfo=packed` is unstable on this platform

  error: aborting due to 1 previous error
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