# Determine the host compiler toolchain.
eval `{grep '^(CC|LD|O)=' /$objtype/mkfile}

vflag=()
if(~ $1 -v) {
	vflag=(-v)
	shift
}

fn bootstrapenv {
	GOROOT=$GOROOT_BOOTSTRAP GO111MODULE=off GOENV=off GOOS=() GOARCH=() GOEXPERIMENT=() GOFLAGS=() $*
}

bootgo = 1.20.6
GOROOT = `{cd .. && pwd}
goroot_bootstrap_set = 'true'
if(! ~ $#GOROOT_BOOTSTRAP 1){
	goroot_bootstrap_set = 'false'

in three different shell languages
L162::: (make.bash, make.bat, make.rc).
L163:
L164::copydist
L165:mkdir "%GOTOOLDIR%" 2>NUL
L166:copy cmd\dist\dist.exe "%GOTOOLDIR%\"
L167:goto :eof
L168:
L169::nogoenv
L170:set GO111MODULE=off
L171:set GOENV=off
L172:set GOOS=
L173:set GOARCH=
L174:set GOEXPERIMENT=
L175:set GOFLAGS=
L176:goto :eof
L177:
L178::bootstrapfail
L179:echo ERROR: Cannot find %GOROOT_BOOTSTRAP%\bin\go.exe
L180:echo Set GOROOT_BOOTSTRAP to a working Go tree ^>= Go %bootgo%.
...

// and reports whether the effective value differs from the default.
func EnvFile() (string, bool, error) {
	if file := os.Getenv("GOENV"); file != "" {
		if file == "off" {
			return "", false, fmt.Errorf("GOENV=off")
		}
		return file, true, nil
	}
	dir, err := os.UserConfigDir()
	if err != nil {
		return "", false, err
	}
	if dir == "" {

	for d in sdk/go$bootgo go$bootgo; do
		if [[ -d "$HOME/$d" ]]; then
			GOROOT_BOOTSTRAP="$HOME/$d"
		fi
	done
fi
export GOROOT_BOOTSTRAP

bootstrapenv() {
	GOROOT="$GOROOT_BOOTSTRAP" GO111MODULE=off GOENV=off GOOS= GOARCH= GOEXPERIMENT= GOFLAGS= "$@"
}

export GOROOT="$(cd .. && pwd)"
IFS=$'\n'; for go_exe in $(type -ap go); do
	if [[ ! -x "$GOROOT_BOOTSTRAP/bin/go" ]]; then
		goroot_bootstrap=$GOROOT_BOOTSTRAP

	env := []cfg.EnvVar{
		{Name: "GO111MODULE", Value: cfg.Getenv("GO111MODULE")},
		{Name: "GOARCH", Value: cfg.Goarch, Changed: cfg.Goarch != runtime.GOARCH},
		{Name: "GOBIN", Value: cfg.GOBIN},
		{Name: "GOCACHE"},
		{Name: "GOENV", Value: envFile, Changed: envFileChanged},
		{Name: "GOEXE", Value: cfg.ExeSuffix},

		// List the raw value of GOEXPERIMENT, not the cleaned one.
		// The set of default experiments may change from one release

are recorded in a Go environment configuration file stored in the
per-user configuration directory, as reported by os.UserConfigDir.
The location of the configuration file can be changed by setting
the environment variable GOENV, and 'go env GOENV' prints the
effective location, but 'go env -w' cannot change the default location.
See 'go help env' for details.

General-purpose environment variables:

	GO111MODULE

# Target: environment and tools
#-----------------------------------------------------------------------------
.PHONY: show.env show.goenv

show.env: ; $(info $(H) environment variables...)
	$(Q) printenv

show.goenv: ; $(info $(H) go environment...)
	$(Q) $(GO) version
	$(Q) $(GO) env

# show makefile variables. Usage: make show.<variable-name>
show.%: ; $(info $* $(H) $($*))

		// tests to attempt to overwrite the installed standard library.
		// Bail out entirely in this case.
		goHostOS = goEnv("GOHOSTOS")
		os.Setenv("TESTGO_GOHOSTOS", goHostOS)
		goHostArch = goEnv("GOHOSTARCH")
		os.Setenv("TESTGO_GOHOSTARCH", goHostArch)

		cgoEnabled = goEnv("CGO_ENABLED")

		// Duplicate the test executable into the path at testGo, for $PATH.

	// always go to GOROOT/bin anyway.
	os.Setenv("GOBIN", gorootBin)

	// Make the environment more predictable.
	os.Setenv("LANG", "C")
	os.Setenv("LANGUAGE", "en_US.UTF8")
	os.Unsetenv("GO111MODULE")
	os.Setenv("GOENV", "off")
	os.Unsetenv("GOFLAGS")
	os.Setenv("GOWORK", "off")

	workdir = xworkdir()
	if err := os.WriteFile(pathf("%s/go.mod", workdir), []byte("module bootstrap"), 0666); err != nil {

// per-user configuration directory, as reported by os.UserConfigDir.
// The location of the configuration file can be changed by setting
// the environment variable GOENV, and 'go env GOENV' prints the
// effective location, but 'go env -w' cannot change the default location.
// See 'go help env' for details.
//
// General-purpose environment variables:
//
//	GO111MODULE