nixpkgs/pkgs/development/compilers/llvm/12/libunwind/default.nix

{ lib, stdenv, version, fetch, libcxx, llvm, cmake
, enableShared ? !stdenv.hostPlatform.isStatic
}:

stdenv.mkDerivation rec {
  pname = "libunwind";
  inherit version;

  src = fetch pname "1x8wpmsrsgnwj2v5ih52ylni7r6n8gzkcj6hx65zbxski2rablly";

  postUnpack = ''
    unpackFile ${libcxx.src}
    mv libcxx-* libcxx
    unpackFile ${llvm.src}
    mv llvm-* llvm
  '';

  nativeBuildInputs = [ cmake ];

  cmakeFlags = lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF";
}