// is arbitrary; we just need something sufficiently large that uses
	// external linking.
	exe := filepath.Join(dir, "go.exe")
	out, err := testenv.Command(t, testenv.GoToolPath(t), "build", "-o", exe, "-ldflags=-linkmode=external -debugtextsize=1048576", "cmd/go").CombinedOutput()
	if err != nil {
		t.Fatalf("build failure: %s\n%s\n", err, string(out))
	}

	// Check that we did split text sections.

		This is only used in internal link mode.
		If not set, default value comes from running the compiler,
		which may be set by the -extld option.
		Set to "none" to use no support library.
	-linkmode mode
		Set link mode (internal, external, auto).
		This sets the linking mode as described in cmd/cgo/doc.go.
	-linkshared
		Link against installed Go shared libraries (experimental).
	-memprofile file

	default:
		ctxt.Errorf(s, "trampoline called with non-jump reloc: %d (%s)", r.Type(), sym.RelocName(ctxt.Arch, r.Type()))
	}
}

// generate a trampoline to target+offset.
func gentramp(arch *sys.Arch, linkmode ld.LinkMode, ldr *loader.Loader, tramp *loader.SymbolBuilder, target loader.Sym, offset int64) {
	tramp.SetSize(12) // 3 instructions
	P := make([]byte, tramp.Size())
	t := ldr.SymValue(target) + offset

		Xoffset:  uint32(f.stringTable.add(name)),
		Xftype:   XFT_FN,
		Xauxtype: _AUX_FILE,
	}
	f.addSymbol(auxf)

	/* Dwarf */
	for _, sect := range Segdwarf.Sections {
		var dwsize uint64
		if ctxt.LinkMode == LinkInternal {
			// Find the size of this corresponding package DWARF compilation unit.
			// This size is set during DWARF generation (see dwarf.go).
			dwsize = getDwsectCUSize(sect.Name, name)

	// We now have enough information to determine the link mode.
	determineLinkMode(ctxt)

	if ctxt.LinkMode == LinkExternal && !iscgo && !(buildcfg.GOOS == "darwin" && ctxt.BuildMode != BuildModePlugin && ctxt.Arch.Family == sys.AMD64) {
		// This indicates a user requested -linkmode=external.
		// The startup code uses an import of runtime/cgo to decide
		// whether to initialize the TLS.  So give it one. This could

	}
	flagHeadType := flag.String("H", "", "set header `type`")
	flag.BoolVar(&ctxt.linkShared, "linkshared", false, "link against installed Go shared libraries")
	flag.Var(&ctxt.LinkMode, "linkmode", "set link `mode`")
	flag.Var(&ctxt.BuildMode, "buildmode", "set build `mode`")
	flag.BoolVar(&ctxt.compressDWARF, "compressdwarf", true, "compress DWARF if possible")

func TestDisasmExtld(t *testing.T) {
	testenv.MustHaveCGO(t)
	switch runtime.GOOS {
	case "plan9":
		t.Skipf("skipping on %s", runtime.GOOS)
	}
	t.Parallel()
	testDisasm(t, "fmthello.go", false, false, "-ldflags=-linkmode=external")
}

func TestDisasmPIE(t *testing.T) {
	if !platform.BuildModeSupported("gc", "pie", runtime.GOOS, runtime.GOARCH) {
		t.Skipf("skipping on %s/%s, PIE buildmode not supported", runtime.GOOS, runtime.GOARCH)

#
# GO_EXTLINK_ENABLED: Set to 1 to invoke the host linker when building
# packages that use cgo.  Set to 0 to do all linking internally.  This
# controls the default behavior of the linker's -linkmode option.  The
# default value depends on the system.
#
# GO_LDSO: Sets the default dynamic linker/loader (ld.so) to be used
# by the internal linker.
#
# CC: Command line to run to compile C code for GOHOSTARCH.

	args := []string{"build", "-o", exe}
	switch linktype {
	case linkNoCgo:
	case linkCgoDefault:
	case linkCgoInternal:
		args = append(args, "-ldflags", "-linkmode=internal")
	case linkCgoExternal:
		args = append(args, "-ldflags", "-linkmode=external")
	default:
		t.Fatalf("invalid linktype parameter of %v", linktype)
	}
	args = append(args, src)

		r := relocs.At(ri)
		if r.IsMarker() {
			continue // skip marker relocations
		}
		rSym := r.Sym()
		if r.Weak() && !ldr.AttrReachable(rSym) {
			continue
		}
		if ctxt.BuildMode == BuildModePIE && ctxt.LinkMode == LinkInternal {
			// It's expected that some relocations will be done
			// later by relocsym (R_TLS_LE, R_ADDROFF), so
			// don't worry if Adddynrel returns false.
			thearch.Adddynrel(target, ldr, syms, s, r, ri)