toolchain("gcc") {
  lib_switch = "-l"
  lib_dir_switch = "-L"

  tool("asm") {
    depfile = "{{output}}.d"
    command = "$cc -MD -MF $depfile {{defines}} {{include_dirs}} {{asmflags}} -c {{source}} -o {{output}}"
    depsformat = "gcc"
    outputs =
        [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
    description = "assemble {{source}}"
  }

  tool("cc") {
    depfile = "{{output}}.d"
    command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_c}} -c {{source}} -o {{output}}"
    depsformat = "gcc"
    outputs =
        [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
    description = "compile {{output}}"
  }

  tool("cxx") {
    depfile = "{{output}}.d"
    command = "$cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}"
    depsformat = "gcc"
    outputs =
        [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
    description = "compile {{output}}"
  }

  tool("objc") {
    depfile = "{{output}}.d"
    command = "$cc -MMD -MF $depfile {{defines}} {{include_dirs}} {{framework_dirs}} {{cflags}} {{cflags_c}} {{cflags_objc}} -c {{source}} -o {{output}}"
    depsformat = "gcc"
    outputs =
        [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
    description = "compile {{output}}"
  }

  tool("objcxx") {
    depfile = "{{output}}.d"
    command = "$cxx -MMD -MF $depfile {{defines}} {{include_dirs}} {{framework_dirs}} {{cflags}} {{cflags_cc}} {{cflags_objcc}} -c {{source}} -o {{output}}"
    depsformat = "gcc"
    outputs =
        [ "{{source_out_dir}}/{{target_output_name}}.{{source_name_part}}.o" ]
    description = "compile {{output}}"
  }

  if (is_apple) {
    not_needed([ "ar" ])  # libtool is used instead.
  }

  tool("alink") {
    if (is_apple) {
      command =
          "libtool -static -o {{output}} -no_warning_for_no_symbols {{inputs}}"
    } else {
      command = "rm -f {{output}} && $ar rcs {{output}} {{inputs}}"
    }
    outputs =
        [ "{{target_out_dir}}/{{target_output_name}}{{output_extension}}" ]
    default_output_extension = ".a"
    output_prefix = "lib"
    description = "link {{target_output_name}}{{output_extension}}"
  }

  tool("solink") {
    soname = "{{target_output_name}}{{output_extension}}"
    sofile = "{{output_dir}}/$soname"
    rspfile = soname + ".rsp"
    if (is_apple) {
      os_specific_option = "-install_name @executable_path/$sofile"
      rspfile_content = "{{inputs}} {{solibs}} {{libs}}"
    } else {
      os_specific_option = "-Wl,-soname=$soname"
      rspfile_content = "-Wl,--whole-archive {{inputs}} {{solibs}} -Wl,--no-whole-archive {{libs}}"
    }
    command = "$cxx -shared {{ldflags}} {{frameworks}} -o $sofile $os_specific_option @$rspfile"
    default_output_extension = ".so"
    default_output_dir = "{{root_out_dir}}"
    outputs = [ sofile ]
    link_output = sofile
    depend_output = sofile
    output_prefix = "lib"
    description = "link $soname"
  }

  tool("link") {
    outfile = "{{target_output_name}}{{output_extension}}"
    rspfile = "$outfile.rsp"
    rspfile_content = "{{inputs}}"
    if (is_apple) {
      command = "$cxx {{ldflags}} {{solibs}} {{libs}} {{frameworks}} -o $outfile @$rspfile"
    } else {
      command = "$cxx {{ldflags}} -o $outfile -Wl,--start-group @$rspfile {{solibs}} -Wl,--end-group {{libs}}"
    }
    default_output_dir = "{{root_out_dir}}"
    outputs = [ outfile ]
    description = "link $outfile"
  }

  if (host_os == "win") {
    tool("stamp") {
      command = "cmd.exe /c echo > {{output}}"
      description = "stamp {{output}}"
    }

    tool("copy") {
      # Note: The build in copy command can't handle forward slashes as path separators.
      # Use a python script as a work around.
      # command = "cmd.exe /c copy /Y {{source}} {{output}}"

      copy_cmd = rebase_path("../copy.py")
      command = "python \"$copy_cmd\" {{source}} {{output}}"

      description = "copy {{source}} {{output}}"
    }
  } else {
    tool("stamp") {
      command = "touch {{output}}"
      description = "stamp {{output}}"
    }

    tool("copy") {
      command = "cp -af {{source}} {{output}}"
      description = "copy {{source}} {{output}}"
    }
  }
}