152 lines
3.3 KiB
Go
152 lines
3.3 KiB
Go
// 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"
|
|
"strings"
|
|
)
|
|
|
|
var (
|
|
defaultGOROOT = defaultGOROOTValue()
|
|
|
|
GOROOT = envOr("GOROOT", defaultGOROOT)
|
|
GOARCH = envOr("GOARCH", defaultGOARCH)
|
|
GOOS = envOr("GOOS", defaultGOOS)
|
|
GO386 = envOr("GO386", defaultGO386)
|
|
GOAMD64 = goamd64()
|
|
GOARM = goarm()
|
|
GOMIPS = gomips()
|
|
GOMIPS64 = gomips64()
|
|
GOPPC64 = goppc64()
|
|
GOWASM = gowasm()
|
|
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
|
|
}
|
|
Error = fmt.Errorf("invalid GOPPC64: must be power8, power9")
|
|
return int(defaultGOPPC64[len("power")] - '0')
|
|
}
|
|
|
|
type gowasmFeatures struct {
|
|
SignExt bool
|
|
SatConv 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)
|
|
}
|