github.com/zxy12/go_duplicate_112_new@v0.0.0-20200807091221-747231827200/src/cmd/dist/build_var.go

package main

import (
	"os"
	"sync"
	"time"
)

// Initialization for any invocation.

// The usual variables.
var (
	goarch           string
	gobin            string
	gohostarch       string
	gohostos         string
	goos             string
	goarm            string
	go386            string
	gomips           string
	gomips64         string
	goroot           string
	goroot_final     string
	goextlinkenabled string
	gogcflags        string // For running built compiler
	goldflags        string
	workdir          string
	tooldir          string
	oldgoos          string
	oldgoarch        string
	exe              string
	defaultcc        map[string]string
	defaultcxx       map[string]string
	defaultcflags    string
	defaultldflags   string
	defaultpkgconfig string

	rebuildall   bool
	defaultclang bool

	vflag int // verbosity
)

// The known architectures.
var okgoarch = []string{
	"386",
	"amd64",
	"amd64p32",
	"arm",
	"arm64",
	"mips",
	"mipsle",
	"mips64",
	"mips64le",
	"ppc64",
	"ppc64le",
	"riscv64",
	"s390x",
	"sparc64",
	"wasm",
}

// The known operating systems.
var okgoos = []string{
	"darwin",
	"dragonfly",
	"js",
	"linux",
	"android",
	"solaris",
	"freebsd",
	"nacl",
	"netbsd",
	"openbsd",
	"plan9",
	"windows",
	"aix",
}

// cleanlist is a list of packages with generated files and commands.
var cleanlist = []string{
	"runtime/internal/sys",
	"cmd/cgo",
	"cmd/go/internal/cfg",
	"go/build",
}

var runtimegen = []string{
	"zaexperiment.h",
	"zversion.go",
}

// gentab records how to generate some trivial files.
var gentab = []struct {
	nameprefix string
	gen        func(string, string)
}{
	{"zdefaultcc.go", mkzdefaultcc},
	{"zosarch.go", mkzosarch},
	{"zversion.go", mkzversion},
	{"zcgo.go", mkzcgo},

	// not generated anymore, but delete the file if we see it
	{"enam.c", nil},
	{"anames5.c", nil},
	{"anames6.c", nil},
	{"anames8.c", nil},
	{"anames9.c", nil},
}

// Cannot use go/build directly because cmd/dist for a new release
// builds against an old release's go/build, which may be out of sync.
// To reduce duplication, we generate the list for go/build from this.
//
// We list all supported platforms in this list, so that this is the
// single point of truth for supported platforms. This list is used
// by 'go tool dist list'.
var cgoEnabled = map[string]bool{
	"aix/ppc64":       false,
	"darwin/386":      true,
	"darwin/amd64":    true,
	"darwin/arm":      true,
	"darwin/arm64":    true,
	"dragonfly/amd64": true,
	"freebsd/386":     true,
	"freebsd/amd64":   true,
	"freebsd/arm":     false,
	"linux/386":       true,
	"linux/amd64":     true,
	"linux/arm":       true,
	"linux/arm64":     true,
	"linux/ppc64":     false,
	"linux/ppc64le":   true,
	"linux/mips":      true,
	"linux/mipsle":    true,
	"linux/mips64":    true,
	"linux/mips64le":  true,
	"linux/riscv64":   true,
	"linux/s390x":     true,
	"linux/sparc64":   true,
	"android/386":     true,
	"android/amd64":   true,
	"android/arm":     true,
	"android/arm64":   true,
	"js/wasm":         false,
	"nacl/386":        false,
	"nacl/amd64p32":   false,
	"nacl/arm":        false,
	"netbsd/386":      true,
	"netbsd/amd64":    true,
	"netbsd/arm":      true,
	"openbsd/386":     true,
	"openbsd/amd64":   true,
	"openbsd/arm":     true,
	"plan9/386":       false,
	"plan9/amd64":     false,
	"plan9/arm":       false,
	"solaris/amd64":   true,
	"windows/386":     true,
	"windows/amd64":   true,
	"windows/arm":     false,
}

// List of platforms which are supported but not complete yet. These get
// filtered out of cgoEnabled for 'dist list'. See golang.org/issue/28944
var incomplete = map[string]bool{
	"linux/riscv64": true,
	"linux/sparc64": true,
}

var (
	timeLogEnabled = os.Getenv("GOBUILDTIMELOGFILE") != ""
	timeLogMu      sync.Mutex
	timeLogFile    *os.File
	timeLogStart   time.Time
)

var toolchain = []string{"cmd/asm", "cmd/cgo", "cmd/compile", "cmd/link"}

// installed maps from a dir name (as given to install) to a chan
// closed when the dir's package is installed.
var installed = make(map[string]chan struct{})
var installedMu sync.Mutex

/*
 * Tool building
 */

// deptab lists changes to the default dependencies for a given prefix.
// deps ending in /* read the whole directory; deps beginning with -
// exclude files with that prefix.
// Note that this table applies only to the build of cmd/go,
// after the main compiler bootstrap.
var deptab = []struct {
	prefix string   // prefix of target
	dep    []string // dependency tweaks for targets with that prefix
}{
	{"cmd/go/internal/cfg", []string{
		"zdefaultcc.go",
		"zosarch.go",
	}},
	{"runtime/internal/sys", []string{
		"zversion.go",
	}},
	{"go/build", []string{
		"zcgo.go",
	}},
}

// depsuffix records the allowed suffixes for source files.
var depsuffix = []string{
	".s",
	".go",
}

// The old tools that no longer live in $GOBIN or $GOROOT/bin.
var oldtool = []string{
	"5a", "5c", "5g", "5l",
	"6a", "6c", "6g", "6l",
	"8a", "8c", "8g", "8l",
	"9a", "9c", "9g", "9l",
	"6cov",
	"6nm",
	"6prof",
	"cgo",
	"ebnflint",
	"goapi",
	"gofix",
	"goinstall",
	"gomake",
	"gopack",
	"gopprof",
	"gotest",
	"gotype",
	"govet",
	"goyacc",
	"quietgcc",
}

// Unreleased directories (relative to $GOROOT) that should
// not be in release branches.
var unreleased = []string{
	"src/cmd/newlink",
	"src/cmd/objwriter",
	"src/debug/goobj",
	"src/old",
}