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// Copyright 2021 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 buildcfg provides access to the build configuration
// described by the current environment. It is for use by build tools
// such as cmd/go or cmd/compile and for setting up go/build's Default context.
//
// Note that it does NOT provide access to the build configuration used to
// build the currently-running binary. For that, use runtime.GOOS etc
// as well as internal/goexperiment.
package buildcfg
import (
"fmt"
"os"
"path/filepath"
"runtime"
"strings"
)
var (
GOROOT = runtime.GOROOT() // cached for efficiency
GOARCH = envOr("GOARCH", defaultGOARCH)
GOOS = envOr("GOOS", defaultGOOS)
GO386 = envOr("GO386", defaultGO386)
GOAMD64 = goamd64()
GOARM = goarm()
GOMIPS = gomips()
GOMIPS64 = gomips64()
GOPPC64 = goppc64()
GOWASM = gowasm()
ToolTags = toolTags()
GO_LDSO = defaultGO_LDSO
Version = version
)
// Error is one of the errors found (if any) in the build configuration.
var Error error
// Check exits the program with a fatal error if Error is non-nil.
func Check() {
if Error != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", filepath.Base(os.Args[0]), Error)
os.Exit(2)
}
}
func envOr(key, value string) string {
if x := os.Getenv(key); x != "" {
return x
}
return value
}
func goamd64() int {
switch v := envOr("GOAMD64", defaultGOAMD64); v {
case "v1":
return 1
case "v2":
return 2
case "v3":
return 3
case "v4":
return 4
}
Error = fmt.Errorf("invalid GOAMD64: must be v1, v2, v3, v4")
return int(defaultGOAMD64[len("v")] - '0')
}
func goarm() int {
def := defaultGOARM
if GOOS == "android" && GOARCH == "arm" {
// Android arm devices always support GOARM=7.
def = "7"
}
switch v := envOr("GOARM", def); v {
case "5":
return 5
case "6":
return 6
case "7":
return 7
}
Error = fmt.Errorf("invalid GOARM: must be 5, 6, 7")
return int(def[0] - '0')
}
func gomips() string {
switch v := envOr("GOMIPS", defaultGOMIPS); v {
case "hardfloat", "softfloat":
return v
}
Error = fmt.Errorf("invalid GOMIPS: must be hardfloat, softfloat")
return defaultGOMIPS
}
func gomips64() string {
switch v := envOr("GOMIPS64", defaultGOMIPS64); v {
case "hardfloat", "softfloat":
return v
}
Error = fmt.Errorf("invalid GOMIPS64: must be hardfloat, softfloat")
return defaultGOMIPS64
}
func goppc64() int {
switch v := envOr("GOPPC64", defaultGOPPC64); v {
case "power8":
return 8
case "power9":
return 9
case "power10":
return 10
}
Error = fmt.Errorf("invalid GOPPC64: must be power8, power9, power10")
return int(defaultGOPPC64[len("power")] - '0')
}
type gowasmFeatures struct {
SatConv bool
SignExt bool
}
func (f gowasmFeatures) String() string {
var flags []string
if f.SatConv {
flags = append(flags, "satconv")
}
if f.SignExt {
flags = append(flags, "signext")
}
return strings.Join(flags, ",")
}
func gowasm() (f gowasmFeatures) {
for _, opt := range strings.Split(envOr("GOWASM", ""), ",") {
switch opt {
case "satconv":
f.SatConv = true
case "signext":
f.SignExt = true
case "":
// ignore
default:
Error = fmt.Errorf("invalid GOWASM: no such feature %q", opt)
}
}
return
}
func Getgoextlinkenabled() string {
return envOr("GO_EXTLINK_ENABLED", defaultGO_EXTLINK_ENABLED)
}
func toolTags() []string {
tags := experimentTags()
tags = append(tags, gogoarchTags()...)
return tags
}
func experimentTags() []string {
var list []string
// For each experiment that has been enabled in the toolchain, define a
// build tag with the same name but prefixed by "goexperiment." which can be
// used for compiling alternative files for the experiment. This allows
// changes for the experiment, like extra struct fields in the runtime,
// without affecting the base non-experiment code at all.
for _, exp := range Experiment.Enabled() {
list = append(list, "goexperiment."+exp)
}
return list
}
// GOGOARCH returns the name and value of the GO$GOARCH setting.
// For example, if GOARCH is "amd64" it might return "GOAMD64", "v2".
func GOGOARCH() (name, value string) {
switch GOARCH {
case "386":
return "GO386", GO386
case "amd64":
return "GOAMD64", fmt.Sprintf("v%d", GOAMD64)
case "arm":
return "GOARM", fmt.Sprintf("%d", GOARM)
case "mips", "mipsle":
return "GOMIPS", GOMIPS
case "mips64", "mips64le":
return "GOMIPS64", GOMIPS64
case "ppc64", "ppc64le":
return "GOPPC64", fmt.Sprintf("power%d", GOPPC64)
case "wasm":
return "GOWASM", GOWASM.String()
}
return "", ""
}
func gogoarchTags() []string {
switch GOARCH {
case "386":
return []string{GOARCH + "." + GO386}
case "amd64":
var list []string
for i := 1; i <= GOAMD64; i++ {
list = append(list, fmt.Sprintf("%s.v%d", GOARCH, i))
}
return list
case "arm":
var list []string
for i := 5; i <= GOARM; i++ {
list = append(list, fmt.Sprintf("%s.%d", GOARCH, i))
}
return list
case "mips", "mipsle":
return []string{GOARCH + "." + GOMIPS}
case "mips64", "mips64le":
return []string{GOARCH + "." + GOMIPS64}
case "ppc64", "ppc64le":
var list []string
for i := 8; i <= GOPPC64; i++ {
list = append(list, fmt.Sprintf("%s.power%d", GOARCH, i))
}
return list
case "wasm":
var list []string
if GOWASM.SatConv {
list = append(list, GOARCH+".satconv")
}
if GOWASM.SignExt {
list = append(list, GOARCH+".signext")
}
return list
}
return nil
}
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