{ "config":
  { "doc":
    [ "Generate a C/C++ config header"
    , ""
    , "Generate a C/C++ configuration header using defines specified via the"
    , "target configuration. In the usual case, a target using this rule is"
    , "configured by depending on it from a target that uses the built-in"
    , "\"configure\" rule."
    ]
  , "field_doc":
    { "name": ["Name of the header file to generate (incl. file name ext)."]
    , "guard": ["The include guard. Multiple segments are joined with \"_\"."]
    , "stage":
      ["The location of the header. Path segments are joined with \"/\"."]
    , "hdrs":
      [ "Additional header files to be available in the include path. Useful"
      , "for providing additional header files to values given in"
      , "\"have_{cfile,cxxfile,ctype,cxxtype,csymbol,cxxsymbol}\"."
      ]
    , "deps":
      [ "Additional public header files from targets to be available in the"
      , "include path. Useful for providing additional header files to values"
      , "given in \"have_{cfile,cxxfile,ctype,cxxtype,csymbol,cxxsymbol}\"."
      ]
    }
  , "config_doc":
    { "CXX":
      [ "The name of the C++ compiler to be used by checks. If None, the"
      , "respective value from [\"CC\", \"defaults\"] will be taken."
      ]
    , "CC":
      [ "The name of the C compiler to be used by checks. If None, the"
      , "respective value from [\"CC\", \"defaults\"] will be taken."
      ]
    , "CFLAGS":
      [ "The flags for CXX to be used instead of the default ones"
      , "taken from the [\"CC\", \"defaults\"] target"
      ]
    , "CXXFLAGS":
      [ "The flags for CXX to be used instead of the default ones"
      , "taken from the [\"CC\", \"defaults\"] target"
      ]
    , "ADD_CFLAGS":
      [ "The flags to add to the default ones for CC"
      , "taken from the [\"CC\", \"defaults\"] target"
      ]
    , "ADD_CXXFLAGS":
      [ "The flags to add to the default ones for CXX"
      , "taken from the [\"CC\", \"defaults\"] target"
      ]
    , "ENV": ["The environment for running file/symbol/type checks."]
    , "defines":
      [ "Set a define to a specific value unless its value is \"null\". Must"
      , "contain a list of pairs. The first element of each pair is the define"
      , "name and the second argument is the value to set. Strings must be"
      , "properly escaped. Defines generated from this field are added last,"
      , "so that they can refer to defines from other \"defines*\" and"
      , "\"have_*\" values."
      ]
    , "defines1":
      [ "Set a define to \"1\" unless its value is untrue. Must contain a list"
      , "of pairs. The first element of each pair is the define name and the"
      , "second argument is the value."
      ]
    , "defines01":
      [ "Set a define to \"0\" or \"1\" depending on its value being true."
      , "Must contain a list of pairs. The first element of each pair is the"
      , "define name and the second argument is the value."
      ]
    , "have_cfile":
      [ "Set a define to \"1\" if the specified C header is in the include"
      , "path. Must contain a list of pairs. The first element of each pair is"
      , "the define name and the second argument is the C header file name."
      ]
    , "have_cxxfile":
      [ "Set a define to \"1\" if the specified C++ header is in the include"
      , "path. Must contain a list of pairs. The first element of each pair is"
      , "the define name and the second argument is the C++ header file name."
      ]
    , "have_ctype":
      [ "Set a define to \"1\" if the specified C type is defined. Must"
      , "contain a list of pairs. The first element of each pair is the define"
      , "name and the second argument is name of the C type. If the specified"
      , "C type is not a built-in type, additionally the headers"
      , "\"sys/types.h\", \"stdint.h\", and \"stddef.h\" are checked as well."
      ]
    , "have_cxxtype":
      [ "Set a define to \"1\" if the specified C++ type is defined. Must"
      , "contain a list of pairs. The first element of each pair is the define"
      , "name and the second argument is name of the C++ type. If the specified"
      , "C++ type is not a built-in type, additionally the headers"
      , "\"sys/types.h\", \"stdint.h\", and \"stddef.h\" are checked as well."
      ]
    , "have_csymbol":
      [ "Set a define to \"1\" if the specified C symbol is defined by one of"
      , "the specified headers in the include path. Must contain a list of"
      , "pairs. The first element of each pair is the define name and the"
      , "second argument is another pair. This pair's first value is the C"
      , "symbol to search for and the second value is a list with the header"
      , "file names to consider for searching."
      ]
    , "have_cxxsymbol":
      [ "Set a define to \"1\" if the specified C++ symbol is defined by one of"
      , "the specified headers in the include path. Must contain a list of"
      , "pairs. The first element of each pair is the define name and the"
      , "second argument is another pair. This pair's first value is the C++"
      , "symbol to search for and the second value is a list with the header"
      , "file names to consider for searching."
      ]
    }
  , "string_fields": ["name", "stage", "guard"]
  , "target_fields": ["hdrs", "deps"]
  , "config_vars":
    [ "CC"
    , "CXX"
    , "CFLAGS"
    , "CXXFLAGS"
    , "ADD_CFLAGS"
    , "ADD_CXXFLAGS"
    , "ENV"
    , "defines"
    , "defines1"
    , "defines01"
    , "have_cfile"
    , "have_cxxfile"
    , "have_ctype"
    , "have_cxxtype"
    , "have_csymbol"
    , "have_cxxsymbol"
    ]
  , "imports":
    { "first": "first_list_entry"
    , "last": "last_list_entry"
    , "artifacts": ["./", "../..", "field_artifacts"]
    , "compile-deps": ["./", "..", "compile-deps"]
    , "default-CC": ["./", "..", "default-CC"]
    , "default-CXX": ["./", "..", "default-CXX"]
    , "default-CFLAGS": ["./", "..", "default-CFLAGS"]
    , "default-CXXFLAGS": ["./", "..", "default-CXXFLAGS"]
    , "default-ENV": ["./", "..", "default-ENV"]
    }
  , "implicit": {"defaults": [["./", "..", "defaults"]]}
  , "expression":
    { "type": "let*"
    , "bindings":
      [ ["name", {"type": "join", "$1": {"type": "FIELD", "name": "name"}}]
      , [ "stage"
        , { "type": "join"
          , "separator": "/"
          , "$1": {"type": "FIELD", "name": "stage"}
          }
        ]
      , [ "guard"
        , { "type": "assert_non_empty"
          , "msg": "Config header include guard may not be empty"
          , "$1":
            { "type": "join"
            , "separator": "_"
            , "$1": {"type": "FIELD", "name": "guard"}
            }
          }
        ]
      , [ "includes"
        , { "type": "to_subdir"
          , "subdir": "include"
          , "$1":
            { "type": "disjoint_map_union"
            , "msg": "Includes may not overlap"
            , "$1":
              [ { "type": "let*"
                , "bindings": [["fieldname", "hdrs"]]
                , "body": {"type": "CALL_EXPRESSION", "name": "artifacts"}
                }
              , { "type": "let*"
                , "bindings": [["deps-fieldnames", ["deps"]]]
                , "body": {"type": "CALL_EXPRESSION", "name": "compile-deps"}
                }
              ]
            }
          }
        ]
      , [ "CC"
        , { "type": "var"
          , "name": "CC"
          , "default": {"type": "CALL_EXPRESSION", "name": "default-CC"}
          }
        ]
      , [ "CXX"
        , { "type": "var"
          , "name": "CXX"
          , "default": {"type": "CALL_EXPRESSION", "name": "default-CXX"}
          }
        ]
      , [ "CFLAGS"
        , { "type": "++"
          , "$1":
            [ { "type": "var"
              , "name": "CFLAGS"
              , "default":
                {"type": "CALL_EXPRESSION", "name": "default-CFLAGS"}
              }
            , {"type": "var", "name": "ADD_CFLAGS", "default": []}
            ]
          }
        ]
      , [ "CXXFLAGS"
        , { "type": "++"
          , "$1":
            [ { "type": "var"
              , "name": "CXXFLAGS"
              , "default":
                {"type": "CALL_EXPRESSION", "name": "default-CXXFLAGS"}
              }
            , {"type": "var", "name": "ADD_CXXFLAGS", "default": []}
            ]
          }
        ]
      , [ "ENV"
        , { "type": "map_union"
          , "$1":
            { "type": "++"
            , "$1":
              [ {"type": "CALL_EXPRESSION", "name": "default-ENV"}
              , [ { "type": "var"
                  , "name": "ENV"
                  , "default": {"type": "empty_map"}
                  }
                ]
              ]
            }
          }
        ]
      , [ "c.flags"
        , { "type": "BLOB"
          , "data":
            { "type": "join"
            , "separator": "\n"
            , "$1": {"type": "var", "name": "CFLAGS"}
            }
          }
        ]
      , [ "cxx.flags"
        , { "type": "BLOB"
          , "data":
            { "type": "join"
            , "separator": "\n"
            , "$1": {"type": "var", "name": "CXXFLAGS"}
            }
          }
        ]
      , [ "file_check.sh"
        , { "type": "BLOB"
          , "data":
            { "type": "join"
            , "separator": "\n"
            , "$1":
              [ "set -eu"
              , "[ $# -ge 4 ]"
              , "CC=$1"
              , "LANG=$2"
              , "DEF=$3"
              , "HDR=$4"
              , "DEFINE=\"/* #undef $DEF */\""
              , "echo \"#include \\\"$HDR\\\"\" > test.$LANG"
              , "if $CC @$LANG.flags -c test.$LANG -I ./include 2>/dev/null; then DEFINE=\"#define $DEF 1\"; fi"
              , "if [ -f in/${LANG}files.def ]; then cat in/${LANG}files.def > ${LANG}files.def; fi"
              , "echo \"$DEFINE\n\" >> ${LANG}files.def"
              ]
            }
          }
        ]
      , [ "type_check.sh"
        , { "type": "BLOB"
          , "data":
            { "type": "join"
            , "separator": "\n"
            , "$1":
              [ "set -eu"
              , "[ $# -ge 4 ]"
              , "CC=$1"
              , "LANG=$2"
              , "DEF=$3"
              , "TYPE=$4"
              , "INC=\"\""
              , "DEFINE=\"/* #undef $DEF */\""
              , "for HDR in \"\" \"sys/types.h\" \"stdint.h\" \"stddef.h\"; do"
              , "  if [ -n \"$HDR\" ]; then INC=\"#include \\\"$HDR\\\"\"; fi"
              , "  cat > test.$LANG << EOF"
              , "$INC"
              , "$TYPE* __test;"
              , "EOF"
              , "  if $CC @$LANG.flags -c test.$LANG -I ./include 2>/dev/null; then"
              , "    DEFINE=\"#define $DEF 1\""
              , "    break"
              , "  fi"
              , "done"
              , "if [ -f in/${LANG}types.def ]; then cat in/${LANG}types.def > ${LANG}types.def; fi"
              , "echo \"$DEFINE\n\" >> ${LANG}types.def"
              ]
            }
          }
        ]
      , [ "symbol_check.sh"
        , { "type": "BLOB"
          , "data":
            { "type": "join"
            , "separator": "\n"
            , "$1":
              [ "set -eu"
              , "[ $# -ge 4 ]"
              , "CC=$1"
              , "shift"
              , "LANG=$1"
              , "shift"
              , "DEF=$1"
              , "shift"
              , "SYMBOL=$1"
              , "shift"
              , "DEFINE=\"/* #undef $DEF */\""
              , "for INC in \"$@\"; do"
              , "  cat > test.$LANG << EOF"
              , "#include \"$INC\""
              , "#ifndef $SYMBOL"
              , "void* __test = &$SYMBOL;"
              , "#endif"
              , "EOF"
              , "  if $CC @$LANG.flags -c test.$LANG -I ./include 2>/dev/null; then"
              , "    DEFINE=\"#define $DEF 1\""
              , "    break"
              , "  fi"
              , "done"
              , "if [ -f in/${LANG}symbols.def ]; then cat in/${LANG}symbols.def > ${LANG}symbols.def; fi"
              , "echo \"$DEFINE\n\" >> ${LANG}symbols.def"
              ]
            }
          }
        ]
      , [ "guard.def"
        , { "type": "singleton_map"
          , "key": "guard.def"
          , "value":
            { "type": "BLOB"
            , "data":
              { "type": "join"
              , "separator": "\n"
              , "$1":
                [ { "type": "join"
                  , "separator": " "
                  , "$1": ["#ifndef", {"type": "var", "name": "guard"}]
                  }
                , { "type": "join"
                  , "separator": " "
                  , "$1": ["#define", {"type": "var", "name": "guard"}]
                  }
                , "\n\n"
                ]
              }
            }
          }
        ]
      , [ "plain.def"
        , { "type": "singleton_map"
          , "key": "plain.def"
          , "value":
            { "type": "BLOB"
            , "data":
              { "type": "join"
              , "$1":
                { "type": "foreach"
                , "range": {"type": "var", "name": "defines", "default": []}
                , "var": "pair"
                , "body":
                  { "type": "let*"
                  , "bindings":
                    [ ["list", {"type": "var", "name": "pair"}]
                    , [ "def"
                      , { "type": "assert_non_empty"
                        , "msg": "Define name in 'defines' may not be empty"
                        , "$1": {"type": "CALL_EXPRESSION", "name": "first"}
                        }
                      ]
                    , ["val", {"type": "CALL_EXPRESSION", "name": "last"}]
                    ]
                  , "body":
                    { "type": "join"
                    , "separator": " "
                    , "$1":
                      { "type": "case*"
                      , "expr": {"type": "var", "name": "val"}
                      , "case":
                        [ [ null
                          , [ "/* #undef"
                            , {"type": "var", "name": "def"}
                            , "*/\n\n"
                            ]
                          ]
                        ]
                      , "default":
                        [ "#define"
                        , {"type": "var", "name": "def"}
                        , { "type": "join"
                          , "$1": [{"type": "var", "name": "val"}, "\n\n"]
                          }
                        ]
                      }
                    }
                  }
                }
              }
            }
          }
        ]
      , [ "int1.def"
        , { "type": "singleton_map"
          , "key": "int1.def"
          , "value":
            { "type": "BLOB"
            , "data":
              { "type": "join"
              , "$1":
                { "type": "foreach"
                , "range": {"type": "var", "name": "defines1", "default": []}
                , "var": "pair"
                , "body":
                  { "type": "let*"
                  , "bindings":
                    [ ["list", {"type": "var", "name": "pair"}]
                    , [ "def"
                      , { "type": "assert_non_empty"
                        , "msg": "Define name in 'defines1' may not be empty"
                        , "$1": {"type": "CALL_EXPRESSION", "name": "first"}
                        }
                      ]
                    , ["val", {"type": "CALL_EXPRESSION", "name": "last"}]
                    ]
                  , "body":
                    { "type": "join"
                    , "separator": " "
                    , "$1":
                      { "type": "if"
                      , "cond": {"type": "var", "name": "val"}
                      , "then":
                        ["#define", {"type": "var", "name": "def"}, "1\n\n"]
                      , "else":
                        ["/* #undef", {"type": "var", "name": "def"}, "*/\n\n"]
                      }
                    }
                  }
                }
              }
            }
          }
        ]
      , [ "int01.def"
        , { "type": "singleton_map"
          , "key": "int01.def"
          , "value":
            { "type": "BLOB"
            , "data":
              { "type": "join"
              , "$1":
                { "type": "foreach"
                , "range": {"type": "var", "name": "defines01", "default": []}
                , "var": "pair"
                , "body":
                  { "type": "let*"
                  , "bindings":
                    [ ["list", {"type": "var", "name": "pair"}]
                    , [ "def"
                      , { "type": "assert_non_empty"
                        , "msg": "Define name in 'defines01' may not be empty"
                        , "$1": {"type": "CALL_EXPRESSION", "name": "first"}
                        }
                      ]
                    , ["val", {"type": "CALL_EXPRESSION", "name": "last"}]
                    ]
                  , "body":
                    { "type": "join"
                    , "separator": " "
                    , "$1":
                      [ "#define"
                      , {"type": "var", "name": "def"}
                      , { "type": "if"
                        , "cond": {"type": "var", "name": "val"}
                        , "then": "1\n\n"
                        , "else": "0\n\n"
                        }
                      ]
                    }
                  }
                }
              }
            }
          }
        ]
      , [ "cfiles.def"
        , { "type": "foldl"
          , "range": {"type": "var", "name": "have_cfile", "default": []}
          , "start":
            { "type": "singleton_map"
            , "key": "cfiles.def"
            , "value": {"type": "BLOB", "data": ""}
            }
          , "accum_var": "cfiles.def"
          , "var": "pair"
          , "body":
            { "type": "let*"
            , "bindings":
              [ ["list", {"type": "var", "name": "pair"}]
              , [ "def"
                , { "type": "assert_non_empty"
                  , "msg": "Define name in 'have_cfile' may not be empty"
                  , "$1": {"type": "CALL_EXPRESSION", "name": "first"}
                  }
                ]
              , ["val", {"type": "CALL_EXPRESSION", "name": "last"}]
              ]
            , "body":
              { "type": "ACTION"
              , "inputs":
                { "type": "map_union"
                , "$1":
                  [ { "type": "to_subdir"
                    , "subdir": "in"
                    , "$1": {"type": "var", "name": "cfiles.def"}
                    }
                  , {"type": "env", "vars": ["file_check.sh", "c.flags"]}
                  , {"type": "var", "name": "includes"}
                  ]
                }
              , "cmd":
                [ "sh"
                , "./file_check.sh"
                , {"type": "var", "name": "CC"}
                , "c"
                , {"type": "var", "name": "def"}
                , {"type": "var", "name": "val"}
                ]
              , "env": {"type": "var", "name": "ENV"}
              , "outs": ["cfiles.def"]
              }
            }
          }
        ]
      , [ "cxxfiles.def"
        , { "type": "foldl"
          , "range": {"type": "var", "name": "have_cxxfile", "default": []}
          , "start":
            { "type": "singleton_map"
            , "key": "cxxfiles.def"
            , "value": {"type": "BLOB", "data": ""}
            }
          , "accum_var": "cxxfiles.def"
          , "var": "pair"
          , "body":
            { "type": "let*"
            , "bindings":
              [ ["list", {"type": "var", "name": "pair"}]
              , [ "def"
                , { "type": "assert_non_empty"
                  , "msg": "Define name in 'have_cxxfile' may not be empty"
                  , "$1": {"type": "CALL_EXPRESSION", "name": "first"}
                  }
                ]
              , ["val", {"type": "CALL_EXPRESSION", "name": "last"}]
              ]
            , "body":
              { "type": "ACTION"
              , "inputs":
                { "type": "map_union"
                , "$1":
                  [ { "type": "to_subdir"
                    , "subdir": "in"
                    , "$1": {"type": "var", "name": "cxxfiles.def"}
                    }
                  , {"type": "env", "vars": ["file_check.sh", "cxx.flags"]}
                  , {"type": "var", "name": "includes"}
                  ]
                }
              , "cmd":
                [ "sh"
                , "./file_check.sh"
                , {"type": "var", "name": "CXX"}
                , "cxx"
                , {"type": "var", "name": "def"}
                , {"type": "var", "name": "val"}
                ]
              , "env": {"type": "var", "name": "ENV"}
              , "outs": ["cxxfiles.def"]
              }
            }
          }
        ]
      , [ "ctypes.def"
        , { "type": "foldl"
          , "range": {"type": "var", "name": "have_ctype", "default": []}
          , "start":
            { "type": "singleton_map"
            , "key": "ctypes.def"
            , "value": {"type": "BLOB", "data": ""}
            }
          , "accum_var": "ctypes.def"
          , "var": "pair"
          , "body":
            { "type": "let*"
            , "bindings":
              [ ["list", {"type": "var", "name": "pair"}]
              , [ "def"
                , { "type": "assert_non_empty"
                  , "msg": "Define name in 'have_ctype' may not be empty"
                  , "$1": {"type": "CALL_EXPRESSION", "name": "first"}
                  }
                ]
              , ["type", {"type": "CALL_EXPRESSION", "name": "last"}]
              ]
            , "body":
              { "type": "ACTION"
              , "inputs":
                { "type": "map_union"
                , "$1":
                  [ { "type": "to_subdir"
                    , "subdir": "in"
                    , "$1": {"type": "var", "name": "ctypes.def"}
                    }
                  , {"type": "env", "vars": ["type_check.sh", "c.flags"]}
                  , {"type": "var", "name": "includes"}
                  ]
                }
              , "cmd":
                [ "sh"
                , "./type_check.sh"
                , {"type": "var", "name": "CC"}
                , "c"
                , {"type": "var", "name": "def"}
                , {"type": "var", "name": "type"}
                ]
              , "env": {"type": "var", "name": "ENV"}
              , "outs": ["ctypes.def"]
              }
            }
          }
        ]
      , [ "cxxtypes.def"
        , { "type": "foldl"
          , "range": {"type": "var", "name": "have_cxxtype", "default": []}
          , "start":
            { "type": "singleton_map"
            , "key": "cxxtypes.def"
            , "value": {"type": "BLOB", "data": ""}
            }
          , "accum_var": "cxxtypes.def"
          , "var": "pair"
          , "body":
            { "type": "let*"
            , "bindings":
              [ ["list", {"type": "var", "name": "pair"}]
              , [ "def"
                , { "type": "assert_non_empty"
                  , "msg": "Define name in 'have_cxxtype' may not be empty"
                  , "$1": {"type": "CALL_EXPRESSION", "name": "first"}
                  }
                ]
              , ["type", {"type": "CALL_EXPRESSION", "name": "last"}]
              ]
            , "body":
              { "type": "ACTION"
              , "inputs":
                { "type": "map_union"
                , "$1":
                  [ { "type": "to_subdir"
                    , "subdir": "in"
                    , "$1": {"type": "var", "name": "cxxtypes.def"}
                    }
                  , {"type": "env", "vars": ["type_check.sh", "cxx.flags"]}
                  , {"type": "var", "name": "includes"}
                  ]
                }
              , "cmd":
                [ "sh"
                , "./type_check.sh"
                , {"type": "var", "name": "CXX"}
                , "cxx"
                , {"type": "var", "name": "def"}
                , {"type": "var", "name": "type"}
                ]
              , "env": {"type": "var", "name": "ENV"}
              , "outs": ["cxxtypes.def"]
              }
            }
          }
        ]
      , [ "csymbols.def"
        , { "type": "foldl"
          , "range": {"type": "var", "name": "have_csymbol", "default": []}
          , "start":
            { "type": "singleton_map"
            , "key": "csymbols.def"
            , "value": {"type": "BLOB", "data": ""}
            }
          , "accum_var": "csymbols.def"
          , "var": "pair"
          , "body":
            { "type": "let*"
            , "bindings":
              [ ["list", {"type": "var", "name": "pair"}]
              , [ "def"
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                  , "msg": "Define name in 'have_csymbol' may not be empty"
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}