{ lib, stdenv, fetch, cmake, python3, libcxxabi, llvm, fixDarwinDylibNames
, version, enableShared ? true }:

stdenv.mkDerivation {
  pname = "libc++";
  inherit version;

  src = fetch "libcxx" "0ylbkcd38zrrz9xmkq9na3d9s8d96hc286dwfwd73wi205lyc7kc";

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

  preConfigure = lib.optionalString stdenv.hostPlatform.isMusl ''
    patchShebangs utils/cat_files.py
  '';

  nativeBuildInputs = [ cmake python3 ]
    ++ lib.optional stdenv.isDarwin fixDarwinDylibNames;

  buildInputs = [ libcxxabi ];

  cmakeFlags = [ "-DLIBCXX_CXX_ABI=libcxxabi" ]
    ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi)
    "-DLIBCXX_HAS_MUSL_LIBC=1"
    ++ lib.optional (stdenv.hostPlatform.useLLVM or false)
    "-DLIBCXX_USE_COMPILER_RT=ON" ++ lib.optional stdenv.hostPlatform.isWasm [
      "-DLIBCXX_ENABLE_THREADS=OFF"
      "-DLIBCXX_ENABLE_FILESYSTEM=OFF"
      "-DLIBCXX_ENABLE_EXCEPTIONS=OFF"
    ] ++ lib.optional (!enableShared) "-DLIBCXX_ENABLE_SHARED=OFF";

  enableParallelBuilding = true;

  passthru = { isLLVM = true; };

  meta = {
    homepage = "https://libcxx.llvm.org/";
    description =
      "A new implementation of the C++ standard library, targeting C++11";
    license = with lib.licenses; [ ncsa mit ];
    platforms = lib.platforms.all;
  };
}