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6851a55f28
New test case for issue 38068, which deals with build reproducibility: do a pair of compilations, the first with the concurrent back end turned on, and the second with -c=1, then check to make sure we get the same output (using a test case that triggers late inlining into wrapper methods). Updates #38068. Change-Id: I4afaf78898706a66985f09d18f6f6f29876c9017 Reviewed-on: https://go-review.googlesource.com/c/go/+/234417 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com> Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
112 lines
2.9 KiB
Go
112 lines
2.9 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package gc_test
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import (
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"bytes"
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"internal/testenv"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"testing"
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)
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func TestReproducibleBuilds(t *testing.T) {
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tests := []string{
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"issue20272.go",
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"issue27013.go",
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"issue30202.go",
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}
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testenv.MustHaveGoBuild(t)
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iters := 10
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if testing.Short() {
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iters = 4
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}
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t.Parallel()
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for _, test := range tests {
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test := test
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t.Run(test, func(t *testing.T) {
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t.Parallel()
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var want []byte
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tmp, err := ioutil.TempFile("", "")
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if err != nil {
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t.Fatalf("temp file creation failed: %v", err)
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}
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defer os.Remove(tmp.Name())
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defer tmp.Close()
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for i := 0; i < iters; i++ {
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// Note: use -c 2 to expose any nondeterminism which is the result
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// of the runtime scheduler.
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out, err := exec.Command(testenv.GoToolPath(t), "tool", "compile", "-c", "2", "-o", tmp.Name(), filepath.Join("testdata", "reproducible", test)).CombinedOutput()
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if err != nil {
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t.Fatalf("failed to compile: %v\n%s", err, out)
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}
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obj, err := ioutil.ReadFile(tmp.Name())
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if err != nil {
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t.Fatalf("failed to read object file: %v", err)
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}
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if i == 0 {
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want = obj
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} else {
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if !bytes.Equal(want, obj) {
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t.Fatalf("builds produced different output after %d iters (%d bytes vs %d bytes)", i, len(want), len(obj))
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}
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}
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}
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})
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}
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}
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func TestIssue38068(t *testing.T) {
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testenv.MustHaveGoBuild(t)
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t.Parallel()
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// Compile a small package with and without the concurrent
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// backend, then check to make sure that the resulting archives
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// are identical. Note: this uses "go tool compile" instead of
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// "go build" since the latter will generate differnent build IDs
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// if it sees different command line flags.
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scenarios := []struct {
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tag string
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args string
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libpath string
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}{
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{tag: "serial", args: "-c=1"},
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{tag: "concurrent", args: "-c=2"}}
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tmpdir, err := ioutil.TempDir("", "TestIssue38068")
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if err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(tmpdir)
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src := filepath.Join("testdata", "reproducible", "issue38068.go")
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for i := range scenarios {
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s := &scenarios[i]
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s.libpath = filepath.Join(tmpdir, s.tag+".a")
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// Note: use of "-p" required in order for DWARF to be generated.
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cmd := exec.Command(testenv.GoToolPath(t), "tool", "compile", "-trimpath", "-p=issue38068", "-buildid=", s.args, "-o", s.libpath, src)
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out, err := cmd.CombinedOutput()
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if err != nil {
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t.Fatalf("%v: %v:\n%s", cmd.Args, err, out)
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}
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}
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readBytes := func(fn string) []byte {
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payload, err := ioutil.ReadFile(fn)
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if err != nil {
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t.Fatalf("failed to read executable '%s': %v", fn, err)
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}
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return payload
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}
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b1 := readBytes(scenarios[0].libpath)
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b2 := readBytes(scenarios[1].libpath)
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if !bytes.Equal(b1, b2) {
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t.Fatalf("concurrent and serial builds produced different output")
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}
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}
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