// This isn't actually a Go buildmode, just a convenient way to tell
			// cgoTest we want static linking.
			gt.buildmode = ""
			if linkmode == "external" {
				ldflags = append(ldflags, `-extldflags "-static -pthread"`)
			} else if linkmode == "auto" {
				gt.env = append(gt.env, "CGO_LDFLAGS=-static -pthread")
			} else {
				panic("unknown linkmode with static build: " + linkmode)
			}

	// even when linking with -static, causing a linker
	// error when using GNU ld. So take out -rdynamic if
	// we added it. We do it in this order, rather than
	// only adding -rdynamic later, so that -extldflags
	// can override -rdynamic without using -static.
	// Similarly for -Wl,--dynamic-linker.
	checkStatic := func(arg string) {
		if ctxt.IsELF && arg == "-static" {
			for i := range argv {