{ "shell-build":
  { "vars":
    [ "cmds"
    , "sources"
    , "localbase"
    , "installed_files"
    , "installed_dirs"
    , "CC"
    , "CXX"
    , "CFLAGS"
    , "CXXFLAGS"
    , "LDFLAGS"
    , "ADD_CFLAGS"
    , "ADD_CXXFLAGS"
    , "ADD_LDFLAGS"
    , "ENV"
    , "AR"
    , "PREFIX"
    , "BUILD_POSITION_INDEPENDENT"
    , "TIMEOUT_SCALE"
    , "FOREIGN_EXECUTION_PROPERTIES"
    , "resolve_symlinks"
    ]
  , "imports":
    { "artifacts": ["", "field_artifacts"]
    , "flags-cc": ["CC", "flags-cc"]
    , "flags-cxx": ["CC", "flags-cxx"]
    , "compiler-cc": ["CC", "compiler-cc"]
    , "compiler-cxx": ["CC", "compiler-cxx"]
    , "default-LDFLAGS": ["CC", "default-LDFLAGS"]
    , "default-AR": ["CC", "default-AR"]
    , "default-PATH": ["CC", "default-PATH"]
    , "default-TOOLCHAIN": ["CC", "default-TOOLCHAIN"]
    , "default-NON_SYSTEM_TOOLS": ["CC", "default-NON_SYSTEM_TOOLS"]
    , "foreign-MAKE": ["CC/foreign", "default-MAKE"]
    , "foreign-CMAKE": ["CC/foreign", "default-CMAKE"]
    , "foreign-PATH": ["CC/foreign", "default-PATH"]
    , "foreign-TOOLCHAIN": ["CC/foreign", "default-TOOLCHAIN"]
    , "foreign-NON_SYSTEM_TOOLS": ["CC/foreign", "default-NON_SYSTEM_TOOLS"]
    , "map_provider": ["", "field_map_provider"]
    , "sh": ["shell", "sh"]
    , "sh-PATH": ["shell", "PATH"]
    , "sh prolog": ["shell", "prolog"]
    }
  , "expression":
    { "type": "let*"
    , "bindings":
      [ ["TOOLCHAIN_DIR", "toolchain"]
      , [ "shell TOOLCHAIN"
        , { "type": "let*"
          , "bindings":
            [ ["fieldname", "shell defaults"]
            , ["provider", "TOOLCHAIN"]
            , ["default", {"type": "empty_map"}]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "map_provider"}
          }
        ]
      , [ "sh"
        , { "type": "let*"
          , "bindings": [["fieldname", "shell defaults"]]
          , "body": {"type": "CALL_EXPRESSION", "name": "sh"}
          }
        ]
      , [ "TOOLCHAIN"
        , { "type": "disjoint_map_union"
          , "msg": "Toolchain trees may not overlap"
          , "$1":
            [ {"type": "CALL_EXPRESSION", "name": "foreign-TOOLCHAIN"}
            , {"type": "CALL_EXPRESSION", "name": "default-TOOLCHAIN"}
            , {"type": "var", "name": "shell TOOLCHAIN"}
            ]
          }
        ]
      , [ "TOOLCHAIN"
        , { "type": "to_subdir"
          , "subdir": {"type": "var", "name": "TOOLCHAIN_DIR"}
          , "$1": {"type": "var", "name": "TOOLCHAIN"}
          }
        ]
      , [ "NON_SYSTEM_TOOLS"
        , { "type": "map_union"
          , "$1":
            [ {"type": "CALL_EXPRESSION", "name": "foreign-NON_SYSTEM_TOOLS"}
            , {"type": "CALL_EXPRESSION", "name": "default-NON_SYSTEM_TOOLS"}
            ]
          }
        ]
      , [ "MAKE"
        , { "type": "join"
          , "$1":
            { "type": "++"
            , "$1":
              [ { "type": "if"
                , "cond":
                  { "type": "lookup"
                  , "key": "MAKE"
                  , "map": {"type": "var", "name": "NON_SYSTEM_TOOLS"}
                  }
                , "then": ["./", {"type": "var", "name": "TOOLCHAIN_DIR"}, "/"]
                }
              , {"type": "CALL_EXPRESSION", "name": "foreign-MAKE"}
              ]
            }
          }
        ]
      , [ "CMAKE"
        , { "type": "join"
          , "$1":
            { "type": "++"
            , "$1":
              [ { "type": "if"
                , "cond":
                  { "type": "lookup"
                  , "key": "CMAKE"
                  , "map": {"type": "var", "name": "NON_SYSTEM_TOOLS"}
                  }
                , "then": ["./", {"type": "var", "name": "TOOLCHAIN_DIR"}, "/"]
                }
              , {"type": "CALL_EXPRESSION", "name": "foreign-CMAKE"}
              ]
            }
          }
        ]
      , ["CC", {"type": "CALL_EXPRESSION", "name": "compiler-cc"}]
      , ["CXX", {"type": "CALL_EXPRESSION", "name": "compiler-cxx"}]
      , [ "CFLAGS"
        , { "type": "join"
          , "separator": " "
          , "$1": {"type": "CALL_EXPRESSION", "name": "flags-cc"}
          }
        ]
      , [ "CXXFLAGS"
        , { "type": "join"
          , "separator": " "
          , "$1": {"type": "CALL_EXPRESSION", "name": "flags-cxx"}
          }
        ]
      , [ "LDFLAGS"
        , { "type": "join"
          , "separator": " "
          , "$1":
            { "type": "++"
            , "$1":
              [ ["-Wl,-rpath,$ORIGIN", "-Wl,-rpath,$ORIGIN/../lib"]
              , { "type": "var"
                , "name": "LDFLAGS"
                , "default":
                  {"type": "CALL_EXPRESSION", "name": "default-LDFLAGS"}
                }
              , {"type": "var", "name": "ldflags", "default": []}
              ]
            }
          }
        ]
      , [ "AR"
        , { "type": "var"
          , "name": "AR"
          , "default":
            { "type": "join"
            , "$1":
              { "type": "++"
              , "$1":
                [ { "type": "if"
                  , "cond":
                    { "type": "lookup"
                    , "key": "AR"
                    , "map": {"type": "var", "name": "NON_SYSTEM_TOOLS"}
                    }
                  , "then":
                    ["./", {"type": "var", "name": "TOOLCHAIN_DIR"}, "/"]
                  }
                , {"type": "CALL_EXPRESSION", "name": "default-AR"}
                ]
              }
            }
          }
        ]
      , [ "PREFIX"
        , { "type": "if"
          , "cond": {"type": "var", "name": "make_prefix"}
          , "then":
            { "type": "join"
            , "separator": "/"
            , "$1":
              { "type": "++"
              , "$1": [[""], {"type": "var", "name": "make_prefix"}]
              }
            }
          , "else": {"type": "var", "name": "PREFIX", "default": "/"}
          }
        ]
      , [ "PATH"
        , { "type": "join"
          , "separator": ":"
          , "$1":
            { "type": "nub_left"
            , "$1":
              { "type": "++"
              , "$1":
                [ {"type": "CALL_EXPRESSION", "name": "foreign-PATH"}
                , {"type": "CALL_EXPRESSION", "name": "default-PATH"}
                , { "type": "let*"
                  , "bindings": [["fieldname", "shell defaults"]]
                  , "body": {"type": "CALL_EXPRESSION", "name": "sh-PATH"}
                  }
                ]
              }
            }
          }
        ]
      , [ "ENV"
        , { "type": "map_union"
          , "$1":
            [ { "type": "env"
              , "vars":
                [ "MAKE"
                , "CMAKE"
                , "CC"
                , "CXX"
                , "CFLAGS"
                , "CXXFLAGS"
                , "LDFLAGS"
                , "AR"
                , "PREFIX"
                ]
              }
            , {"type": "var", "name": "ENV", "default": {"type": "empty_map"}}
            ]
          }
        ]
      , [ "localbase"
        , { "type": "to_subdir"
          , "subdir": "localbase"
          , "$1": {"type": "var", "name": "localbase"}
          }
        ]
      , [ "work_dir"
        , { "type": "to_subdir"
          , "subdir": "work"
          , "$1": {"type": "var", "name": "sources"}
          }
        ]
      , [ "script"
        , { "type": "singleton_map"
          , "key": "run_cmds.sh"
          , "value":
            { "type": "BLOB"
            , "data":
              { "type": "join"
              , "separator": "\n"
              , "$1":
                { "type": "++"
                , "$1":
                  [ { "type": "let*"
                    , "bindings": [["fieldname", "shell defaults"]]
                    , "body": {"type": "CALL_EXPRESSION", "name": "sh prolog"}
                    }
                  , [ "set -eu"
                    , "mkdir -p scratch work install"
                    , "export ACTION_DIR=\"$(pwd)\""
                    , "export TMPDIR=\"$(pwd)/scratch\""
                    , "export WORKDIR=\"$(pwd)/work\""
                    , "export TOOLCHAIN=\"$(pwd)/toolchain\""
                    , "export LOCALBASE=\"$(pwd)/localbase\""
                    , "export DESTDIR=\"$(pwd)/install\""
                    , { "type": "if"
                      , "cond":
                        { "type": "lookup"
                        , "key": "CC"
                        , "map": {"type": "var", "name": "NON_SYSTEM_TOOLS"}
                        }
                      , "then": "export CC=$(pwd)/${CC}"
                      , "else": ""
                      }
                    , { "type": "if"
                      , "cond":
                        { "type": "lookup"
                        , "key": "CXX"
                        , "map": {"type": "var", "name": "NON_SYSTEM_TOOLS"}
                        }
                      , "then": "export CXX=$(pwd)/${CXX}"
                      , "else": ""
                      }
                    , { "type": "if"
                      , "cond":
                        { "type": "lookup"
                        , "key": "AR"
                        , "map": {"type": "var", "name": "NON_SYSTEM_TOOLS"}
                        }
                      , "then": "export AR=$(pwd)/${AR}"
                      , "else": ""
                      }
                    , { "type": "if"
                      , "cond":
                        { "type": "lookup"
                        , "key": "MAKE"
                        , "map": {"type": "var", "name": "NON_SYSTEM_TOOLS"}
                        }
                      , "then": "export MAKE=$(pwd)/${MAKE}"
                      , "else": ""
                      }
                    , { "type": "if"
                      , "cond":
                        { "type": "lookup"
                        , "key": "CMAKE"
                        , "map": {"type": "var", "name": "NON_SYSTEM_TOOLS"}
                        }
                      , "then": "export CMAKE=$(pwd)/${CMAKE}"
                      , "else": ""
                      }
                    , { "type": "join"
                      , "$1":
                        [ "export PATH="
                        , { "type": "join_cmd"
                          , "$1": [{"type": "var", "name": "PATH"}]
                          }
                        , "${PATH:+:}\"${PATH}\""
                        ]
                      }
                    ]
                  , ["(", "set --", "cd ./work"]
                  , {"type": "var", "name": "cmds"}
                  , [")"]
                  , { "type": "if"
                    , "cond": {"type": "var", "name": "resolve_symlinks"}
                    , "then":
                      [ "mv install install_with_symlinks"
                      , "cp -rL install_with_symlinks install >copy.log 2>&1 || (echo 'ERROR: symlink resolve failed with:' && cat copy.log && exit 1)"
                      ]
                    }
                  ]
                }
              }
            }
          }
        ]
      , [ "artifacts"
        , { "type": "ACTION"
          , "inputs":
            { "type": "map_union"
            , "$1":
              [ {"type": "var", "name": "TOOLCHAIN"}
              , {"type": "var", "name": "work_dir"}
              , {"type": "var", "name": "localbase"}
              , {"type": "var", "name": "script"}
              ]
            }
          , "cmd": [{"type": "var", "name": "sh"}, "run_cmds.sh"]
          , "outs": {"type": "var", "name": "installed_files"}
          , "out_dirs": {"type": "var", "name": "installed_dirs"}
          , "env": {"type": "var", "name": "ENV"}
          , "timeout scaling":
            {"type": "var", "name": "TIMEOUT_SCALE", "default": 10.0}
          , "execution properties":
            {"type": "var", "name": "FOREIGN_EXECUTION_PROPERTIES"}
          }
        ]
      ]
    , "body": {"type": "var", "name": "artifacts"}
    }
  }
}