// a go.mod file in the current directory or any parent. If none is found,
	// modules may be disabled (GO111MODULE=auto) or commands may run in a
	// limited module mode.
	AutoRoot Root = iota

	// NoRoot is used for commands that run in module mode and ignore any go.mod
	// file the current directory or in parent directories.
	NoRoot

}

// gcState is a trinary variable for the current state of the GC.
//
// The third state besides "enabled" and "disabled" is "undetermined."
type gcState uint8

const (
	gcUndetermined gcState = iota
	gcNotRunning
	gcRunning
)

// String returns a human-readable string for the GC state.
func (s gcState) String() string {
	switch s {
	case gcUndetermined:
		return "Undetermined"

	// file. The reason we say "HasFree" here is so the zero value is
	// correct for a newly-grown chunk. (New memory is scavenged.)
	scavChunkHasFree scavChunkFlags = 1 << iota

	// scavChunkMaxFlags is the maximum number of flags we can have, given how
	// a scavChunkData is packed into 8 bytes.
	scavChunkMaxFlags  = 6
	scavChunkFlagsMask = (1 << scavChunkMaxFlags) - 1

	a2     uint8
	a3     uint8
	type_  int8
	size   int8
	param  int16
	family sys.ArchFamily // 0 means both sys.MIPS and sys.MIPS64
	flag   uint8
}

const (
	// Optab.flag
	NOTUSETMP = 1 << iota // p expands to multiple instructions, but does NOT use REGTMP
)

var optab = []Optab{
	{obj.ATEXT, C_LEXT, C_NONE, C_TEXTSIZE, 0, 0, 0, sys.MIPS64, 0},
	{obj.ATEXT, C_ADDR, C_NONE, C_TEXTSIZE, 0, 0, 0, 0, 0},

	// lookup per module, and we don't want to load information that's neither
	// relevant nor actionable.
	type modFlags int
	const (
		resolved modFlags = 1 << iota // version resolved by 'go get'
		named                         // explicitly named on command line or provides a named package
		hasPkg                        // needed to build named packages

// to safely deal with potentially invalid pointers, since resolving
// such pointers may race with a span being allocated.
type mSpanState uint8

const (
	mSpanDead   mSpanState = iota
	mSpanInUse             // allocated for garbage collected heap
	mSpanManual            // allocated for manual management (e.g., stack allocator)
)

// mSpanStateNames are the names of the span states, indexed by

		c.Cleanup(func() {
			os.Unsetenv(key)
		})
	}
}

// panicHandling controls the panic handling used by runCleanup.
type panicHandling int

const (
	normalPanic panicHandling = iota
	recoverAndReturnPanic
)

// runCleanup is called at the end of the test.
// If ph is recoverAndReturnPanic, it will catch panics, and return the
// recovered value if any.

	// imports to be in "all" (such as when the test is itself within the main
	// module, or when ld.allClosesOverTests is true).
	pkgInAll loadPkgFlags = 1 << iota

	// pkgIsRoot indicates that the package matches one of the root package
	// patterns requested by the caller.
	//
	// If LoadTests is set, then when pkgIsRoot and pkgImportsLoaded are both set,

	}
	if stderr == "" {
		fatalf("%s produced no output\non input:\n%s", gccBaseCmd[0], b.Bytes())
	}

	completed := false
	sniff := make([]int, len(names))
	const (
		notType = 1 << iota
		notIntConst
		notNumConst
		notStrLiteral
		notDeclared
	)
	sawUnmatchedErrors := false
	for _, line := range strings.Split(stderr, "\n") {
		// Ignore warnings and random comments, with one

		if err != io.EOF {
			log.Fatalf("reading input: %v", err)
		}
		return -1
	}
	return int(c)
}

type markKind uint8 // for postorder traversal
const (
	_ markKind = iota
	visiting
	visited
)

func postorder(libs []*sym.Library) []*sym.Library {
	order := make([]*sym.Library, 0, len(libs)) // hold the result
	mark := make(map[*sym.Library]markKind, len(libs))