headersOnce.Do(func() {
		headersErr = createHeaders()
	})
	if headersErr != nil {
		t.Helper()
		t.Fatal(headersErr)
	}
}

// test0: exported symbols in shared lib are accessible.
func TestExportedSymbols(t *testing.T) {
	globalSkip(t)
	testenv.MustHaveCGO(t)
	testenv.MustHaveExec(t)

	t.Parallel()

	cmd := "testp0"
	bin := cmdToRun(cmd)

	createHeadersOnce(t)