{ stdenv, lib, version, src, cmake, python3, llvm, libcxxabi, fetchpatch }:
stdenv.mkDerivation rec {
  pname = "compiler-rt";
  inherit version src;

  nativeBuildInputs = [ cmake python3 llvm ];

  NIX_CFLAGS_COMPILE = [
    "-DSCUDO_DEFAULT_OPTIONS=DeleteSizeMismatch=0:DeallocationTypeMismatch=0"
  ];

  cmakeFlags = [
    "-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON"
    "-DCMAKE_C_COMPILER_TARGET=${stdenv.hostPlatform.config}"
    "-DCMAKE_ASM_COMPILER_TARGET=${stdenv.hostPlatform.config}"
    "-DCOMPILER_RT_BUILD_SANITIZERS=OFF"
    "-DCOMPILER_RT_BUILD_XRAY=OFF"
    "-DCOMPILER_RT_BUILD_LIBFUZZER=OFF"
    "-DCOMPILER_RT_BUILD_PROFILE=OFF"
    "-DCMAKE_C_COMPILER_WORKS=ON"
    "-DCMAKE_CXX_COMPILER_WORKS=ON"
    "-DCOMPILER_RT_BAREMETAL_BUILD=ON"
    "-DCMAKE_SIZEOF_VOID_P=${toString (stdenv.hostPlatform.parsed.cpu.bits / 8)}"
    "-DCOMPILER_RT_BUILD_BUILTINS=ON"
    "-DCMAKE_C_FLAGS=-nodefaultlibs"
    #https://stackoverflow.com/questions/53633705/cmake-the-c-compiler-is-not-able-to-compile-a-simple-test-program
    "-DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY"
  ];

  outputs = [ "out" "dev" ];

  prePatch = ''
    cd compiler-rt
  '';

  # TSAN requires XPC on Darwin, which we have no public/free source files for. We can depend on the Apple frameworks
  # to get it, but they're unfree. Since LLVM is rather central to the stdenv, we patch out TSAN support so that Hydra
  # can build this. If we didn't do it, basically the entire nixpkgs on Darwin would have an unfree dependency and we'd
  # get no binary cache for the entire platform. If you really find yourself wanting the TSAN, make this controllable by
  # a flag and turn the flag off during the stdenv build.
  postPatch = lib.optionalString (!stdenv.isDarwin) ''
    substituteInPlace cmake/builtin-config-ix.cmake \
      --replace 'set(X86 i386)' 'set(X86 i386 i486 i586 i686)'
  '';

  # Hack around weird upsream RPATH bug
  postInstall = ''
    ln -s "$out/lib"/*/* "$out/lib"
    ln -s $out/lib/*/clang_rt.crtbegin-*.o $out/lib/crtbegin.o
    ln -s $out/lib/*/clang_rt.crtend-*.o $out/lib/crtend.o
    ln -s $out/lib/*/clang_rt.crtbegin_shared-*.o $out/lib/crtbeginS.o
    ln -s $out/lib/*/clang_rt.crtend_shared-*.o $out/lib/crtendS.o
  '';

  enableParallelBuilding = true;

  meta = with lib; {
    description = "ROCm fork of the LLVM Compiler runtime libraries";
    homepage = "https://github.com/RadeonOpenCompute/llvm-project";
    license = licenses.ncsa;
    maintainers = with maintainers; [ acowley lovesegfault ];
    platforms = platforms.linux;
  };
}