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 {

			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() {

// 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":