1 // Copyright 2017 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package gc_test 6 7 import ( 8 "bytes" 9 "internal/testenv" 10 "io/ioutil" 11 "os" 12 "os/exec" 13 "path/filepath" 14 "testing" 15 ) 16 17 func TestReproducibleBuilds(t *testing.T) { 18 testenv.MustHaveGoBuild(t) 19 iters := 10 20 if testing.Short() { 21 iters = 4 22 } 23 t.Parallel() 24 var want []byte 25 tmp, err := ioutil.TempFile("", "") 26 if err != nil { 27 t.Fatalf("temp file creation failed: %v", err) 28 } 29 defer os.Remove(tmp.Name()) 30 defer tmp.Close() 31 for i := 0; i < iters; i++ { 32 out, err := exec.Command(testenv.GoToolPath(t), "tool", "compile", "-o", tmp.Name(), filepath.Join("testdata", "reproducible", "issue20272.go")).CombinedOutput() 33 if err != nil { 34 t.Fatalf("failed to compile: %v\n%s", err, out) 35 } 36 obj, err := ioutil.ReadFile(tmp.Name()) 37 if err != nil { 38 t.Fatalf("failed to read object file: %v", err) 39 } 40 if i == 0 { 41 want = obj 42 } else { 43 if !bytes.Equal(want, obj) { 44 t.Fatalf("builds produced different output after %d iters (%d bytes vs %d bytes)", i, len(want), len(obj)) 45 } 46 } 47 } 48 } 49
