"testing"
)

// TestMustLinkExternal verifies that the mustLinkExternal helper
// function matches internal/platform.MustLinkExternal.
func TestMustLinkExternal(t *testing.T) {
	for _, goos := range okgoos {
		for _, goarch := range okgoarch {
			for _, cgoEnabled := range []bool{true, false} {
				got := mustLinkExternal(goos, goarch, cgoEnabled)
				want := platform.MustLinkExternal(goos, goarch, cgoEnabled)
				if got != want {

}

// mustLinkExternal reports whether the program being linked requires
// the external linker be used to complete the link.
func mustLinkExternal(ctxt *Link) (res bool, reason string) {
	if ctxt.Debugvlog > 1 {
		defer func() {
			if res {
				ctxt.Logf("external linking is forced by: %s\n", reason)
			}
		}()
	}

	if platform.MustLinkExternal(buildcfg.GOOS, buildcfg.GOARCH, false) {

	GOOS, _ := s.LookupEnv("GOOS")
	GOARCH, _ := s.LookupEnv("GOARCH")
	return platform.MustLinkExternal(GOOS, GOARCH, true), nil
}

func mustLinkExt(s *script.State) (bool, error) {
	GOOS, _ := s.LookupEnv("GOOS")
	GOARCH, _ := s.LookupEnv("GOARCH")
	return platform.MustLinkExternal(GOOS, GOARCH, false), nil
}

func pieLinkExt(s *script.State) (bool, error) {
	GOOS, _ := s.LookupEnv("GOOS")

	case "amd64", "arm64":
		// TODO(#14565): support more architectures.
		return FuzzSupported(goos, goarch)
	default:
		return false
	}
}

// MustLinkExternal reports whether goos/goarch requires external linking
// with or without cgo dependencies.
func MustLinkExternal(goos, goarch string, withCgo bool) bool {
	if withCgo {
		switch goarch {
		case "loong64", "mips", "mipsle", "mips64", "mips64le":

				fatalf("%s should not exist in release build", p)
			}
		}
	}
}

/*
 * Tool building
 */

// mustLinkExternal is a copy of internal/platform.MustLinkExternal,
// duplicated here to avoid version skew in the MustLinkExternal function
// during bootstrapping.
func mustLinkExternal(goos, goarch string, cgoEnabled bool) bool {
	if cgoEnabled {
		switch goarch {

				// will not be able to exec, so we may as well allow that now.
				t.Logf("HasGoBuild is false on %s", b)
				return
			}
		case "android":
			if isEmulatedBuilder(b) && platform.MustLinkExternal(runtime.GOOS, runtime.GOARCH, false) {
				// As of 2023-05-02, the test environment on the emulated builders is
				// missing a C linker.
				t.Logf("HasGoBuild is false on %s", b)
				return
			}
		}

		if len(out) == 0 {
			goBuildErr = fmt.Errorf("%v: no tool reported", cmd)
			return
		}
		if _, err := exec.LookPath(string(out)); err != nil {
			goBuildErr = err
			return
		}

		if platform.MustLinkExternal(runtime.GOOS, runtime.GOARCH, false) {
			// We can assume that we always have a complete Go toolchain available.
			// However, this platform requires a C linker to build even pure Go

			os.Exit(2)
		}
		os.Exit(0)
	}

	d := t.TempDir()

	// Since we are doing a chroot, we need the binary there,
	// and it must be statically linked.
	testenv.MustHaveGoBuild(t)
	if platform.MustLinkExternal(runtime.GOOS, runtime.GOARCH, false) {
		t.Skipf("skipping: can't build static binary because %s/%s requires external linking", runtime.GOOS, runtime.GOARCH)
	}
	x := filepath.Join(d, "syscall.test")
	t.Cleanup(func() {

		// linker's build id, which will cause our build id to not
		// match the next time the tool is built.
		// Rely on the external build id instead.
		if !platform.MustLinkExternal(cfg.Goos, cfg.Goarch, false) {
			ldflags = append(ldflags, "-X=cmd/internal/objabi.buildID="+root.buildID)
		}
	}

	// Store default GODEBUG in binaries.
	if root.Package.DefaultGODEBUG != "" {

// linking is not required.
func externalLinkingReason(p *Package) (what string) {
	// Some targets must use external linking even inside GOROOT.
	if platform.MustLinkExternal(cfg.Goos, cfg.Goarch, false) {
		return cfg.Goos + "/" + cfg.Goarch
	}

	// Some build modes always require external linking.
	switch cfg.BuildBuildmode {
	case "c-shared", "plugin":