cmd/link: fatal error: cannot find 'ld' without binutils-gold on alpine linux/arm64

[yakkle]

What version of Go are you using (go version)?

$ go version
go version go1.18 linux/arm64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE="on"
GOARCH="arm64"
GOBIN=""
GOCACHE="/root/.cache/go-build"
GOENV="/root/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_arm64"
GOVCS=""
GOVERSION="go1.18"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build1126837739=/tmp/go-build -gno-record-gcc-switches"

What did you do?

go build -ldflags "-v" reproduce.go with below code in alpine linux/arm64

package main

import (
	"fmt"
	"plugin"
)

type pluginWallet struct {
	plugin *plugin.Plugin
}

func main() {
	fmt.Println("hello")
}

What did you expect to see?

successful build without error or show detail log why build failed.

What did you see instead?

~/src/gold # go build -ldflags "-v" reproduce.go
# command-line-arguments
HEADER = -H5 -T0x11000 -R0x10000
host link: "gcc" "-Wl,-znow" "-Wl,-znocopyreloc" "-fuse-ld=gold" "-o" "/tmp/go-build518924850/b001/exe/a.out" "-rdynamic" "/tmp/go-link-2349840200/go.o" "/tmp/go-link-2349840200/000000.o" "/tmp/go-link-2349840200/000001.o" "/tmp/go-link-2349840200/000002.o" "/tmp/go-link-2349840200/000003.o" "/tmp/go-link-2349840200/000004.o" "/tmp/go-link-2349840200/000005.o" "/tmp/go-link-2349840200/000006.o" "/tmp/go-link-2349840200/000007.o" "/tmp/go-link-2349840200/000008.o" "/tmp/go-link-2349840200/000009.o" "/tmp/go-link-2349840200/000010.o" "/tmp/go-link-2349840200/000011.o" "/tmp/go-link-2349840200/000012.o" "/tmp/go-link-2349840200/000013.o" "/tmp/go-link-2349840200/000014.o" "-g" "-O2" "-ldl" "-g" "-O2" "-lpthread"
/usr/local/go/pkg/tool/linux_arm64/link: running gcc failed: exit status 1
collect2: fatal error: cannot find 'ld'
compilation terminated.

---

related issue : #15696

https://github.com/golang/go/blob/go1.18/src/cmd/link/internal/ld/lib.go#L1406-L1416

	if out, err := cmd.CombinedOutput(); err == nil {
		if !bytes.Contains(out, []byte("GNU gold")) {
			log.Fatalf("ARM external linker must be gold (issue #15696), but is not: %s", out)
		}
	}

First, in this ld/lib.go source code, the fatal logs are not printed because of err is not nil.

	// If gold is not installed, gcc will silently switch
	// back to ld.bfd. So we parse the version information
	// and provide a useful error if gold is missing.

Second, following above comments, I expect successful build using ld.bfd. but failed. why?

Third, origin relocation bug fixed binutils 2.36+. https://sourceware.org/bugzilla/show_bug.cgi?id=19962
but, still using gold linker because of above code.

[yakkle]

This issue duplicated and already patched. See #22040