case strings.Contains(out, "s390x"):
			gohostarch = "s390x"
		case gohostos == "darwin", gohostos == "ios":
			if strings.Contains(run("", CheckExit, "uname", "-v"), "RELEASE_ARM64_") {
				gohostarch = "arm64"
			}
		case gohostos == "freebsd":
			if strings.Contains(run("", CheckExit, "uname", "-p"), "riscv64") {
				gohostarch = "riscv64"
			}
		case gohostos == "openbsd" && strings.Contains(out, "powerpc64"):
			gohostarch = "ppc64"

// $CC, if set, applies to all goos/goarch but is overridden by the following.
// $CC_FOR_TARGET, if set, applies to all goos/goarch except gohostos/gohostarch,
// but is overridden by the following.
// If gohostos=goos and gohostarch=goarch, then $CC_FOR_TARGET applies even for gohostos/gohostarch.
// $CC_FOR_goos_goarch, if set, applies only to goos/goarch.
func compilerEnv(envName, def string) map[string]string {

	// GOBIN is empty, so that binaries are installed to GOPATH/bin,
	// and GOOS, GOHOSTOS, GOARCH, and GOHOSTOS are empty,
	// so that Go bootstrap toolchain builds whatever kind of binary it knows how to build.
	// Restore GOROOT, GOPATH, and GOBIN when done.
	// Don't bother with GOOS, GOHOSTOS, GOARCH, and GOHOSTARCH,
	// because setup will take care of those when bootstrapBuildTools returns.

	add("cgo", script.BoolCondition("host CGO_ENABLED", testenv.HasCGO()))
	add("cgolinkext", script.Condition("platform requires external linking for cgo", cgoLinkExt))
	add("cross", script.BoolCondition("cmd/go GOOS/GOARCH != GOHOSTOS/GOHOSTARCH", goHostOS != runtime.GOOS || goHostArch != runtime.GOARCH))
	add("fuzz", sysCondition("-fuzz", platform.FuzzSupported, false))
	add("fuzz-instrumented", sysCondition("-fuzz with instrumentation", platform.FuzzInstrumented, false))

	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
	GORISCV64
	GOROOT
	GOSUMDB
	GOTMPDIR
	GOTOOLCHAIN
	GOTOOLDIR

	if flag.NArg() != 0 {
		usage()
	}

	// Load context.
	goroot = runtime.GOROOT()
	if goroot == "" {
		log.Fatalf("missing $GOROOT")
	}
	gohostos = runtime.GOOS
	gohostarch = runtime.GOARCH
	goos = os.Getenv("GOOS")
	if goos == "" {
		goos = gohostos
	}
	goarch = os.Getenv("GOARCH")
	if goarch == "" {
		goarch = gohostarch
	}
	goosUnderGoarch := goos + "_" + goarch
	goosDashGoarch := goos + "-" + goarch

        GOCACHE="/Users/gopher/go/cache"
        GOENV="/Users/gopher/Library/Application Support/go/env"
        GOEXE=""
        GOEXPERIMENT=""
        GOFLAGS=""
        GOHOSTARCH="arm64"
        GOHOSTOS="darwin"
        GOINSECURE=""
        GOMODCACHE="/Users/gopher/go/pkg/mod"
        GONOPROXY=""
        GONOSUMDB=""
        GOOS="darwin"
        GOPATH="/Users/gopher/go"
        GOPRIVATE=""

	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.
# We need at least ~300 MB of bss.
[ "$(ulimit -H -d)" = "unlimited" ] || ulimit -S -d $(ulimit -H -d)

# Regression test for https://go.dev/issue/62119:
# A 'go' command cross-compiled with a different GOHOSTOS
# should be able to locate its GOROOT using os.Executable.
#
# (This also tests a 'go' command built with -trimpath
# that is not cross-compiled, since we need to build that
# configuration for the test anyway.)

[short] skip 'builds and links another cmd/go'

mkdir $WORK/new/bin
mkdir $WORK/new/bin/${GOOS}_${GOARCH}

		"GOCOVERDIR=" + os.Getenv("GOCOVERDIR"),
		"GODEBUG=" + os.Getenv("GODEBUG"),
		"GOEXE=" + cfg.ExeSuffix,
		"GOEXPERIMENT=" + os.Getenv("GOEXPERIMENT"),
		"GOOS=" + runtime.GOOS,
		"TESTGO_GOHOSTOS=" + goHostOS,
		"GOPROXY=" + proxyURL,
		"GOPRIVATE=",
		"GOROOT=" + testGOROOT,
		"GOTRACEBACK=system",
		"TESTGONETWORK=panic", // allow only local connections by default; the [net] condition resets this