t.Fatalf("Program built with internal linking failed to run with err %v, output: %s", err, out)
	}

	// Build and run with external linking
	cmd = testenv.Command(t, testenv.GoToolPath(t), "build", "-o", "bigtext", "-ldflags", "-linkmode=external")
	cmd.Dir = tmpdir
	out, err = cmd.CombinedOutput()
	if err != nil {
		t.Fatalf("Build failed for big text program with external linking: %v, output: %s", err, out)
	}

	if id != buildID {
		t.Fatalf("buildID in hello binary = %q, want %q", id, buildID)
	}

	switch {
	case !testenv.HasCGO():
		t.Skipf("skipping - no cgo, so assuming external linking not available")
	case runtime.GOOS == "plan9":
		t.Skipf("skipping - external linking not supported")
	}

	tg.run("build", "-ldflags", "-buildid="+buildID+" -linkmode=external", "-o", tg.path("hello2.exe"), tg.path("hello.go"))

#include "textflag.h"
#include "cgo/abi_arm64.h"

TEXT _rt0_arm64_darwin(SB),NOSPLIT|NOFRAME,$0
	MOVD	$runtime·rt0_go(SB), R2
	BL	(R2)
exit:
	MOVD	$0, R0
	MOVD	$1, R16	// sys_exit
	SVC	$0x80
	B	exit

// When linking with -buildmode=c-archive or -buildmode=c-shared,
// this symbol is called from a global initialization function.
//
// Note that all currently shipping darwin/arm64 platforms require
// cgo and do not support c-shared.

	default:
		return false
	}
}

// MustLinkExternal reports whether goos/goarch requires external linking
// with or without cgo dependencies.
func MustLinkExternal(goos, goarch string, withCgo bool) bool {
	if withCgo {
		switch goarch {
		case "loong64", "mips", "mipsle", "mips64", "mips64le":
			// Internally linking cgo is incomplete on some architectures.
			// https://go.dev/issue/14449
			return true
		case "arm64":

[!buildmode:plugin] skip
[short] skip
[!cgo] skip '-buildmode=plugin requires external linking'

go build -trimpath -buildvcs=false -buildmode=plugin -o a.so main.go
go build -trimpath -buildvcs=false -buildmode=plugin -o b.so main.go
cmp -q a.so b.so

-- main.go --
package main

# This test checks that external linking with --gc-sections does not strip version information.

[short] skip
[!cgo] skip
[GOOS:aix] skip  # no --gc-sections
[GOOS:darwin] skip  # no --gc-sections

go build -ldflags='-linkmode=external -extldflags=-Wl,--gc-sections'
go version hello$GOEXE
! stdout 'not a Go executable'
! stderr 'not a Go executable'

-- go.mod --
module hello
-- hello.go --
package main

/*
*/
import "C"

        1 * buildOperationExecutor.runAll(commandLineTool, _) >> { worker, action -> action.execute(queue) }
        1 * invocationContext.getArgAction() >> Actions.doNothing()
        1 * invocationContext.createInvocation("linking lib", expectedArgs, operationLogger) >> invocation
        1 * queue.add(invocation)
        1 * queue.setLogLocation(LOG_LOCATION)
        0 * _
    }

    List<String> getSoNameProp(def value) {

[short] skip
[!cgo] skip '-buildmode=c-shared requires external linking'
[!buildmode:c-shared] stop

env GO111MODULE=on

go get rsc.io/fortune
go build -buildmode=c-shared -o external.so rsc.io/fortune
go version external.so
stdout '^external.so: .+'
go version -m external.so
stdout '^\tpath\trsc.io/fortune'
stdout '^\tmod\trsc.io/fortune\tv1.0.0'

-- go.mod --
module m

-- empty.go --
package main

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Test that a -B option is passed through when using both internal
// and external linking mode.

package main

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
)

func main() {
	test("internal")

		If not set, default value comes from running the compiler,
		which may be set by the -extld option.
		Set to "none" to use no support library.
	-linkmode mode
		Set link mode (internal, external, auto).
		This sets the linking mode as described in cmd/cgo/doc.go.
	-linkshared
		Link against installed Go shared libraries (experimental).
	-memprofile file
		Write memory profile to file.
	-memprofilerate rate