1// run 2 3//go:build !nacl && !js && !wasip1 && !android && !gccgo 4 5// Copyright 2016 The Go Authors. All rights reserved. 6// Use of this source code is governed by a BSD-style 7// license that can be found in the LICENSE file. 8 9package main 10 11import ( 12 "bytes" 13 "fmt" 14 "html/template" 15 "io/ioutil" 16 "log" 17 "os" 18 "os/exec" 19 "path/filepath" 20) 21 22var tmpl = template.Must(template.New("main").Parse(` 23package main 24 25type T struct { 26 {{range .Names}} 27 {{.Name}} *string 28 {{end}} 29} 30 31{{range .Names}} 32func (t *T) Get{{.Name}}() string { 33 if t.{{.Name}} == nil { 34 return "" 35 } 36 return *t.{{.Name}} 37} 38{{end}} 39 40func main() {} 41`)) 42 43func main() { 44 const n = 5000 45 46 type Name struct{ Name string } 47 var t struct{ Names []Name } 48 for i := 0; i < n; i++ { 49 t.Names = append(t.Names, Name{Name: fmt.Sprintf("H%06X", i)}) 50 } 51 52 buf := new(bytes.Buffer) 53 if err := tmpl.Execute(buf, t); err != nil { 54 log.Fatal(err) 55 } 56 57 dir, err := ioutil.TempDir("", "issue16037-") 58 if err != nil { 59 log.Fatal(err) 60 } 61 defer os.RemoveAll(dir) 62 path := filepath.Join(dir, "ridiculous_number_of_fields.go") 63 if err := ioutil.WriteFile(path, buf.Bytes(), 0664); err != nil { 64 log.Fatal(err) 65 } 66 67 out, err := exec.Command("go", "build", "-o="+filepath.Join(dir, "out"), path).CombinedOutput() 68 if err != nil { 69 log.Fatalf("build failed: %v\n%s", err, out) 70 } 71} 72