core/pkgs/by-name/ll/llvm/common/libclc.nix

{
  lib,
  stdenv,
  version,
  runCommand,
  monorepoSrc,
  llvm,
  buildPackages,
  buildLlvmTools,
  ninja,
  cmake,
  python3,
}:

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

  src = runCommand "${pname}-src-${version}" { } ''
    mkdir -p "$out"
    cp -r ${monorepoSrc}/cmake "$out"
    cp -r ${monorepoSrc}/${pname} "$out"
  '';

  sourceRoot = "${src.name}/${pname}";

  outputs = [
    "out"
    "dev"
  ];

  patches = [ ./libclc/libclc-gnu-install-dirs.patch ];

  # cmake expects all required binaries to be in the same place, so it will not be able to find clang without the patch
  postPatch =
    ''
      substituteInPlace CMakeLists.txt \
        --replace 'find_program( LLVM_CLANG clang PATHS ''${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH )' \
                  'find_program( LLVM_CLANG clang PATHS "${buildLlvmTools.clang.cc}/bin" NO_DEFAULT_PATH )' \
        --replace 'find_program( LLVM_AS llvm-as PATHS ''${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH )' \
                  'find_program( LLVM_AS llvm-as PATHS "${buildLlvmTools.llvm}/bin" NO_DEFAULT_PATH )' \
        --replace 'find_program( LLVM_LINK llvm-link PATHS ''${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH )' \
                  'find_program( LLVM_LINK llvm-link PATHS "${buildLlvmTools.llvm}/bin" NO_DEFAULT_PATH )' \
        --replace 'find_program( LLVM_OPT opt PATHS ''${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH )' \
                  'find_program( LLVM_OPT opt PATHS "${buildLlvmTools.llvm}/bin" NO_DEFAULT_PATH )' \
        --replace 'find_program( LLVM_SPIRV llvm-spirv PATHS ''${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH )' \
                  'find_program( LLVM_SPIRV llvm-spirv PATHS "${
                    buildPackages.spirv-llvm-translator.override { inherit (buildLlvmTools) llvm; }
                  }/bin" NO_DEFAULT_PATH )'
    ''
    + lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) ''
      substituteInPlace CMakeLists.txt \
        --replace 'COMMAND prepare_builtins' 'COMMAND ${buildLlvmTools.libclc.dev}/bin/prepare_builtins'
    '';

  nativeBuildInputs = [
    cmake
    ninja
    python3
  ];
  buildInputs = [ llvm ];
  strictDeps = true;

  postInstall = ''
    install -Dt $dev/bin prepare_builtins
  '';

  meta = with lib; {
    homepage = "http://libclc.llvm.org/";
    description = "Implementation of the library requirements of the OpenCL C programming language";
    mainProgram = "prepare_builtins";
    license = licenses.mit;
    platforms = platforms.all;
  };
}