1// Copyright 2015 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
5package objabi
6
7import (
8	"fmt"
9	"strings"
10
11	"internal/buildcfg"
12)
13
14const (
15	ElfRelocOffset   = 256
16	MachoRelocOffset = 2048    // reserve enough space for ELF relocations
17	GlobalDictPrefix = ".dict" // prefix for names of global dictionaries
18)
19
20// HeaderString returns the toolchain configuration string written in
21// Go object headers. This string ensures we don't attempt to import
22// or link object files that are incompatible with each other. This
23// string always starts with "go object ".
24func HeaderString() string {
25	archExtra := ""
26	if k, v := buildcfg.GOGOARCH(); k != "" && v != "" {
27		archExtra = " " + k + "=" + v
28	}
29	return fmt.Sprintf("go object %s %s %s%s X:%s\n",
30		buildcfg.GOOS, buildcfg.GOARCH,
31		buildcfg.Version, archExtra,
32		strings.Join(buildcfg.Experiment.Enabled(), ","))
33}
34