This is a syntactically valid Go program—it can be parsed with the Go
parser and processed by godoc—but it is not compiled directly by gc.
Instead, a separate tool, cgo, processes it to produce three output
files.  The first two, 6g.go and 6c.c, are a Go source file for 6g and
a C source file for 6c; both compile as part of the named package
(gmp, in this example).  The third, gcc.c, is a C source file for gcc;

		cmd := exec.Command(goCmd(), "list", "-e", "-deps", "-json", "std")
		cmd.Env = listEnv(w.context)
		if w.context.Dir != "" {
			cmd.Dir = w.context.Dir
		}
		cmd.Stderr = os.Stderr
		out, err := cmd.Output()
		if err != nil {
			log.Fatalf("loading imports: %v\n%s", err, out)
		}

		var stdPackages []string
		importMap := make(map[string]map[string]string)
		importDir := make(map[string]string)

pkg syscall (linux-386), const PACKET_MULTICAST = 2
pkg syscall (linux-386), const PACKET_OTHERHOST = 3
pkg syscall (linux-386), const PACKET_OUTGOING = 4
pkg syscall (linux-386), const PACKET_RECV_OUTPUT = 3
pkg syscall (linux-386), const PACKET_RX_RING = 5
pkg syscall (linux-386), const PACKET_STATISTICS = 6
pkg syscall (linux-386), const PARENB = 256
pkg syscall (linux-386), const PARMRK = 8

pkg encoding/xml, type TokenReader interface, Token() (Token, error)
pkg flag, method (*FlagSet) ErrorHandling() ErrorHandling
pkg flag, method (*FlagSet) Name() string
pkg flag, method (*FlagSet) Output() io.Writer
pkg html/template, type Srcset string
pkg math, func Erfcinv(float64) float64
pkg math, func Erfinv(float64) float64
pkg math, func Round(float64) float64
pkg math, func RoundToEven(float64) float64

	"cmd/internal/obj"
	"cmd/internal/obj/ppc64"
	"cmd/internal/obj/riscv"
	"cmd/internal/obj/x86"
	"cmd/internal/sys"
)

// TODO: configure the architecture

var testOut *strings.Builder // Gathers output when testing.

// append adds the Prog to the end of the program-thus-far.
// If doLabel is set, it also defines the labels collect for this Prog.
func (p *Parser) append(prog *obj.Prog, cond string, doLabel bool) {

pkg syscall (linux-arm-cgo), const PACKET_OTHERHOST ideal-int
pkg syscall (linux-arm-cgo), const PACKET_OUTGOING ideal-int
pkg syscall (linux-arm-cgo), const PACKET_RECV_OUTPUT ideal-int
pkg syscall (linux-arm-cgo), const PACKET_RX_RING ideal-int
pkg syscall (linux-arm-cgo), const PACKET_STATISTICS ideal-int
pkg syscall (linux-arm-cgo), const PARENB ideal-int