# Test that we can unset variables, even if initially invalid,
# as long as resulting config is valid.

env GOENV=badenv
env GOOS=
env GOARCH=
env GOEXPERIMENT=

! go env
stderr '^go(\.exe)?: unknown GOEXPERIMENT badexp$'

go env -u GOEXPERIMENT

! go env
stderr '^go: unsupported GOOS/GOARCH pair bados/badarch$'

! go env -u GOOS
stderr '^go: unsupported GOOS/GOARCH pair \w+/badarch$'

! go env -u GOARCH

		globalSkip = func(t *testing.T) { t.Skip("no go build") }
		return m.Run()
	}

	GOOS = goEnv("GOOS")
	GOARCH = goEnv("GOARCH")
	GOROOT = goEnv("GOROOT")

	if _, err := os.Stat(GOROOT); os.IsNotExist(err) {
		log.Fatalf("Unable able to find GOROOT at '%s'", GOROOT)
	}

	cc = []string{goEnv("CC")}

	out := goEnv("GOGCCFLAGS")
	quote := '\000'
	start := 0
	lastSpace := true
	backslash := false

	CGO_FFLAGS_DISALLOW
	CGO_LDFLAGS
	CGO_LDFLAGS_ALLOW
	CGO_LDFLAGS_DISALLOW
	CXX
	FC
	GCCGO
	GO111MODULE
	GO386
	GOAMD64
	GOARCH
	GOARM
	GOARM64
	GOBIN
	GOCACHE
	GOCACHEPROG
	GOENV
	GOEXE
	GOEXPERIMENT
	GOFLAGS
	GOGCCFLAGS
	GOHOSTARCH
	GOHOSTOS
	GOINSECURE
	GOMIPS
	GOMIPS64
	GOMODCACHE
	GONOPROXY
	GONOSUMDB
	GOOS
	GOPATH
	GOPPC64
	GOPRIVATE
	GOPROXY

if...

	testenv.MustHaveCGO(t)

	goEnv := func(arg string) string {
		cmd := testenv.Command(t, testenv.GoToolPath(t), "env", arg)
		cmd.Stderr = new(bytes.Buffer)

		line, err := cmd.Output()
		if err != nil {
			t.Fatalf("%v: %v\n%s", cmd, err, cmd.Stderr)
		}
		out := string(bytes.TrimSpace(line))
		t.Logf("%v: %q", cmd, out)
		return out
	}

	cc := goEnv("CC")
	cgoCflags := goEnv("CGO_CFLAGS")

# Defaults to 1.

set -e

if [ ! -f ../bin/go ]; then
	echo 'run.bash must be run from $GOROOT/src after installing cmd/go' 1>&2
	exit 1
fi

export GOENV=off
eval $(../bin/go tool dist env)

unset CDPATH	# in case user has it set

export GOHOSTOS
export CC

# no core files, please
ulimit -c 0

# Raise soft limits to hard limits for NetBSD/OpenBSD.

# argument contains these characters, the entire argument may be quoted
# with single or double quotes. This is the same as -gcflags and similar
# options.

[short] skip
[!exec:clang] [!exec:gcc] skip
[!cgo] skip

env GOENV=$WORK/go.env
mkdir 'program files'
go build -o 'program files' './which cc/which cc.go'
[exec:clang] env CC='"'$PWD${/}program' 'files${/}which' 'cc"' 'clang
[!exec:clang] env CC='"'$PWD${/}program' 'files${/}which' 'cc"' 'gcc

	}
	if overcommit.value == 2 {
		t.Skip("vm.overcommit_memory=2")
	}
}

var env struct {
	sync.Once
	m   map[string]string
	err error
}

// goEnv returns the output of $(go env) as a map.
func goEnv(key string) (string, error) {
	env.Once.Do(func() {
		var out []byte
		out, env.err = exec.Command("go", "env", "-json").Output()
		if env.err != nil {
			return
		}

      label: "Output of `go env` in your module/workspace:"
      placeholder: |
        GO111MODULE=""
        GOARCH="arm64"
        GOBIN="/Users/gopher/go/bin"
        GOCACHE="/Users/gopher/go/cache"
        GOENV="/Users/gopher/Library/Application Support/go/env"
        GOEXE=""
        GOEXPERIMENT=""
        GOFLAGS=""
        GOHOSTARCH="arm64"
        GOHOSTOS="darwin"
        GOINSECURE=""

	os.Setenv("PWD", modRoot)
	if err := os.WriteFile("go.mod", []byte("module testcarchive\n"), 0666); err != nil {
		log.Panic(err)
	}

	GOOS = goEnv("GOOS")
	GOARCH = goEnv("GOARCH")
	bin = cmdToRun("./testp")

	ccOut := goEnv("CC")
	cc = []string{string(ccOut)}

	out := goEnv("GOGCCFLAGS")
	quote := '\000'
	start := 0
	lastSpace := true
	backslash := false
	s := string(out)
	for i, c := range s {