}

// GetBuildID returns the GNU build-ID for an ELF binary.
//
// If no build-ID was found but the binary was read without error, it returns
// (nil, nil).
func GetBuildID(f *elf.File) ([]byte, error) {
	findBuildID := func(notes []elfNote) ([]byte, error) {
		var buildID []byte
		for _, note := range notes {
			if note.Name == "GNU" && note.Type == noteTypeGNUBuildID {
				if buildID == nil {
					buildID = note.Desc

	goTool := testenv.GoToolPath(t)

	cmd := testenv.Command(t, goTool, "build", "-o", outFile, "-ldflags", "-buildid 0x1234 -B gobuildid", goFile)
	cmd.Dir = t.TempDir()

	out, err := cmd.CombinedOutput()
	if err != nil {
		t.Logf("%s", out)
		t.Fatal(err)
	}

	expectedGoBuildID := notsha256.Sum256([]byte("0x1234"))

	gnuBuildID, err := buildid.ReadELFNote(outFile, string(ld.ELF_NOTE_BUILDINFO_NAME), ld.ELF_NOTE_BUILDINFO_TAG)

	Name() string

	// ObjAddr returns the objdump address corresponding to a runtime address.
	ObjAddr(addr uint64) (uint64, error)

	// BuildID returns the GNU build ID of the file, or an empty string.
	BuildID() string

	// SourceLine reports the source line information for a given
	// address in the file. Due to inlining, the source line information

// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package buildid

import (
	"bytes"
	"crypto/sha256"
	"debug/elf"
	"encoding/binary"
	"internal/obscuretestdata"
	"os"
	"reflect"
	"strings"
	"testing"
)

const (

    "TMP",
    "TEMP",

    // Seems important on Windows
    "ALLUSERSPROFILE",
    "PUBLIC",
    "windir",

    // Used by performance test to recognize TeamCity buildId
    "BUILD_ID",
    // Used by some tests to be ignored in specific build
    "BUILD_TYPE_ID",
    "JPROFILER_HOME",

    "LANG",
    "LANGUAGE",

	// Compile a small package with and without the concurrent
	// backend, then check to make sure that the resulting archives
	// are identical.  Note: this uses "go tool compile" instead of
	// "go build" since the latter will generate different build IDs
	// if it sees different command line flags.
	scenarios := []struct {
		tag     string
		args    string
		libpath string
	}{
		{tag: "serial", args: "-c=1"},
		{tag: "concurrent", args: "-c=2"}}

### `gradle` value

This value, nested in `createdBy`, must contain an object with the following values:

- `version`: The version of Gradle. A string
- `buildId`: The buildId for the Gradle instance. A string

### `variants` value

This value must contain an array with zero or more elements. Each element must be an object with the following values:

	size = size - (size % mapsizeRounding)
	key := mappingKey{
		size:   size,
		offset: m.Offset,
	}

	switch {
	case m.BuildID != "":
		key.buildIDOrFile = m.BuildID
	case m.File != "":
		key.buildIDOrFile = m.File
	default:
		// A mapping containing neither build ID nor file name is a fake mapping. A
		// key with empty buildIDOrFile is used for fake mappings so that they are

	tg.run("list", "-export", "-f", "{{.BuildID}}", "strings")
	buildID := strings.TrimSpace(tg.stdout.String())
	if buildID == "" {
		t.Fatalf(".BuildID with -export was empty")
	}

	tg.run("tool", "buildid", file)
	toolBuildID := strings.TrimSpace(tg.stdout.String())
	if buildID != toolBuildID {
		t.Fatalf(".BuildID with -export %q disagrees with 'go tool buildid' %q", buildID, toolBuildID)
	}
}

		ldflags = str.StringList("-Wl,-(", ldflags, "-Wl,-)")
	}

	if root.buildID != "" {
		// On systems that normally use gold or the GNU linker,
		// use the --build-id option to write a GNU build ID note.
		switch cfg.Goos {
		case "android", "dragonfly", "linux", "netbsd":
			ldflags = append(ldflags, fmt.Sprintf("-Wl,--build-id=0x%x", root.buildID))
		}
	}

	var rLibPath string
	if cfg.Goos == "aix" {