{ "toolchain":
  { "type": "configure"
  , "arguments_config": ["ARCH", "BUILD_ARCH"]
  , "config":
    { "type": "singleton_map"
    , "key": "BUILD_ARCH"
    , "value":
      { "type": "var"
      , "name": "BUILD_ARCH"
      , "default":
        { "type": "var"
        , "name": "ARCH"
        , "default":
          {"type": "fail", "msg": "ARCH is required for cross-compiler."}
        }
      }
    }
  , "target": "toolchain_cross"
  }
, "toolchain_cross":
  { "type": "export"
  , "flexible_config":
    ["ARCH", "TARGET_ARCH", "BUILD_ARCH", "TOOLCHAIN_CONFIG", "ENV"]
  , "target": "gcc-musl"
  }
, "runlibs":
  { "type": "export"
  , "flexible_config": ["ARCH", "TARGET_ARCH", "TOOLCHAIN_CONFIG", "ENV"]
  , "target": "libstdc++"
  }
, "separate_patched_sources":
  { "type": "install"
  , "dirs":
    [ [["@", "musl-cross-make", "", "combined_sources_and_patches"], "src"]
    , [["@", "binutils", "", "files"], "binutils"]
    , [["@", "musl", "", "files"], "musl"]
    , [["@", "gmp", "", "files"], "gmp"]
    , [["@", "mpc", "", "files"], "mpc"]
    , [["@", "mpfr", "", "files"], "mpfr"]
    , [["@", "gcc", "", "patched_sources"], "gcc"]
    ]
  }
, "combined_patched_sources":
  { "type": ["@", "rules", "CC/foreign/shell", "data"]
  , "project": ["separate_patched_sources"]
  , "cmds":
    [ "cp -r src/. ${DESTDIR}"
    , "mv binutils ${DESTDIR}/binutils-latest.orig"
    , "mv musl ${DESTDIR}/musl-latest.orig"
    , "mv gmp ${DESTDIR}/gmp-latest.orig"
    , "mv mpc ${DESTDIR}/mpc-latest.orig"
    , "mv mpfr ${DESTDIR}/mpfr-latest.orig"
    , "mv gcc ${DESTDIR}/gcc-13.orig"
    , "chmod +w ${DESTDIR}/config.mak"
    , "printf 'GCC_VER = 13\n' >> ${DESTDIR}/config.mak"
    ]
  , "out_dirs": ["."]
  }
, "strip_for_host":
  { "type": "configure"
  , "arguments_config": ["ARCH"]
  , "config":
    { "type": "singleton_map"
    , "key": "TARGET_ARCH"
    , "value": {"type": "var", "name": "ARCH"}
    }
  , "target": ["@", "binutils", "", "multi-target strip"]
  }
, "gcc-musl":
  { "type": ["@", "rules", "CC/foreign/shell", "data"]
  , "project": ["combined_patched_sources"]
  , "localbase": ["strip_for_host"]
  , "arguments_config": ["BUILD_ARCH"]
  , "cmds":
    { "type": "let*"
    , "bindings":
      [ [ "TARGET"
        , { "type": "case"
          , "expr":
            { "type": "var"
            , "name": "BUILD_ARCH"
            , "default": {"type": "fail", "msg": "BUILD_ARCH is missing."}
            }
          , "case":
            { "x86": "i686"
            , "x86_64": "x86_64"
            , "arm": "arm"
            , "arm64": "aarch64"
            }
          , "default":
            { "type": "fail"
            , "msg":
              ["Unsupported BUILD_ARCH", {"type": "var", "name": "BUILD_ARCH"}]
            }
          }
        ]
      ]
    , "body":
      [ { "type": "join"
        , "$1": ["TARGET=", {"type": "var", "name": "TARGET"}, "-linux-musl"]
        }
      , "export NJOBS=$(nproc --all 2>/dev/null || echo 1)"
      , "export MAKEINFO=missing"
      , "export BUILD_ROOT_DIR=${ACTION_DIR}"
      , "unset CFLAGS CXXFLAGS LDFLAGS"
      , "mv musl-latest.orig musl.readonly"
      , "cp -r musl.readonly musl-latest.orig && chmod -R +w musl-latest.orig"
      , "export check_msgfmt=no   # do not use system's msgfmt, if available"
      , "${MAKE} -j${NJOBS} TARGET=${TARGET} >build.log 2>&1 || (cat build.log && exit 1)"
      , "${MAKE} -j${NJOBS} TARGET=${TARGET} OUTPUT= DESTDIR=${DESTDIR} install >>build.log 2>&1 || (cat build.log && exit 1)"
      , "cd ${DESTDIR}"
      , "STRIP=${LOCALBASE}/bin/strip"
      , "find ./bin/ ./${TARGET}/bin/ ./libexec/gcc/ -type f -exec sh -c \"${STRIP} {} 2>/dev/null\" \\;"
      , "find . -type f -name '*.so*' -exec sh -c \"${STRIP} {} 2>/dev/null\" \\;"
      , "find . -type f -name '*.a' -exec sh -c \"${STRIP} -g {} 2>/dev/null\" \\;"
      , "find . -type f -name '*.o' -exec sh -c \"${STRIP} -g {} 2>/dev/null\" \\;"
      , "for f in $(ls ./bin/${TARGET}-*); do"
      , "  ln -s $(basename $f) $(echo $f | sed 's|/'${TARGET}-'|/|g')"
      , "done"
      , "find . -type l -exec sh -c 'expr match \"$(readlink {})\" \"/\" >/dev/null' \\; -delete"
      , "GCC_LIBDIR=\"lib/gcc/$(./bin/gcc -dumpmachine)/$(./bin/gcc -dumpfullversion -dumpversion)\""
      , "mv ${GCC_LIBDIR}/include-fixed ${TMPDIR}/"
      , "cp -rL ${TMPDIR}/include-fixed ${GCC_LIBDIR}/.   # resolve symlinks"
      ]
    }
  , "out_dirs": ["."]
  }
, "toolchain_for_target":
  { "type": "configure"
  , "arguments_config": ["ARCH", "TARGET_ARCH"]
  , "config":
    { "type": "singleton_map"
    , "key": "BUILD_ARCH"
    , "value":
      { "type": "var"
      , "name": "TARGET_ARCH"
      , "default":
        { "type": "var"
        , "name": "ARCH"
        , "default":
          {"type": "fail", "msg": "ARCH is required for cross-compiler."}
        }
      }
    }
  , "target": "toolchain_cross"
  }
, "libstdc++":
  { "type": ["@", "rules", "CC/prebuilt", "library"]
  , "name": ["libstdc++"]
  , "lib": ["libstdc++_files"]
  , "deps": ["libgcc_s"]
  }
, "libgcc_s":
  { "type": ["@", "rules", "CC/prebuilt", "library"]
  , "name": ["libgcc_s"]
  , "lib": ["libgcc_s_files"]
  }
, "libstdc++_files":
  { "type": "generic"
  , "arguments_config": ["ENV"]
  , "deps": ["toolchain_for_target"]
  , "cmds": ["cp -L $(./bin/gcc -dumpmachine)/lib/libstdc++.so.6 ."]
  , "outs": ["libstdc++.so.6"]
  , "env": {"type": "var", "name": "ENV", "default": {"type": "empty_map"}}
  }
, "libgcc_s_files":
  { "type": "generic"
  , "arguments_config": ["ENV"]
  , "deps": ["toolchain_for_target"]
  , "cmds": ["cp -L $(./bin/gcc -dumpmachine)/lib/libgcc_s.so.1 ."]
  , "outs": ["libgcc_s.so.1"]
  , "env": {"type": "var", "name": "ENV", "default": {"type": "empty_map"}}
  }
}