binutils_version = "2.35"
binutils_checksum = "1b11659fb49e20e18db460d44485f09442c8c56d5df165de9461eb09c8302f85"
gcc_version = "10.2.0"
gcc_checksum = "b8dd4368bb9c7f0b98188317ee0254dd8cc99d1e3a18d0ff146c855fe16c1d8c"
install_path = File.expand_path("i686-elf-gcc")
target = "i686-elf"
path_prepend "#{install_path}/bin"

configure do
  check_c_compiler "gcc"
  check_program "make"
  check_program "bison"
  check_program "flex"
  check_program "texi2any", on_fail: "Install the texinfo package"
  check_program "wget"
  check_lib "gmp", on_fail: "Install the libgmp-dev package"
  check_lib "mpc", on_fail: "Install the libmpc-dev package"
  check_lib "mpfr", on_fail: "Install the libmpfr-dev package"
end

default do
  unless Dir.exist?(install_path)
    # Download archives.
    download "https://ftp.gnu.org/gnu/binutils/binutils-#{binutils_version}.tar.xz",
      "#{build_dir}/binutils-#{binutils_version}.tar.xz",
      sha256sum: binutils_checksum

    download "https://ftp.gnu.org/gnu/gcc/gcc-#{gcc_version}/gcc-#{gcc_version}.tar.xz",
      "#{build_dir}/gcc-#{gcc_version}.tar.xz",
      sha256sum: gcc_checksum

    # Extract archives.
    sh "tar", "xJf", "binutils-#{binutils_version}.tar.xz",
      chdir: build_dir

    sh "tar", "xJf", "gcc-#{gcc_version}.tar.xz",
      chdir: build_dir

    # Build binutils.
    rm_rf "#{build_dir}/build-binutils"
    mkdir_p "#{build_dir}/build-binutils"
    cd "#{build_dir}/build-binutils" do
      sh %W[../binutils-#{binutils_version}/configure
        --target=#{target} --prefix=#{install_path} --with-sysroot --disable-nls
        --disable-werror]
      sh "make"
      sh "make install"
    end

    # Build gcc.
    rm_rf "#{build_dir}/build-gcc"
    mkdir_p "#{build_dir}/build-gcc"
    cd "#{build_dir}/build-gcc" do
      sh %W[../gcc-#{gcc_version}/configure
        --target=#{target} --prefix=#{install_path} --disable-nls
        --enable-languages=c,c++ --without-headers]
      sh "make all-gcc"
      sh "make all-target-libgcc"
      sh "make install-gcc"
      sh "make install-target-libgcc"
    end

    # Remove archives and build directories if everything succeeded.
    rm_f "#{build_dir}/binutils-#{binutils_version}.tar.xz"
    rm_rf "#{build_dir}/binutils-#{binutils_version}"
    rm_rf "#{build_dir}/build-binutils"
    rm_f "#{build_dir}/gcc-#{gcc_version}.tar.xz"
    rm_rf "#{build_dir}/gcc-#{gcc_version}"
    rm_rf "#{build_dir}/build-gcc"
  end
end

distclean do
  rm_rf install_path
end