Build failed for ios/amd64 and ios/arm64

[enty8080]

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

$ go version
go version go1.16beta1 darwin/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=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/enty8080/Library/Caches/go-build"
GOENV="/Users/enty8080/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/enty8080/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="ios"
GOPATH="/Users/enty8080/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_arm64"
GOVCS=""
GOVERSION="go1.16beta1"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="0"
GOMOD="/dev/null"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/mp/l216mspj1r793n3f2zhh8vg40000gn/T/go-build1094833471=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

$ export GOOS=ios
$ export GOARCH=arm64
$ go build main.go
# command-line-arguments
loadinternal: cannot find runtime/cgo
$ export GOARCH=amd64
$ go build main.go
# command-line-arguments
loadinternal: cannot find runtime/cgo
/usr/local/go/pkg/tool/darwin_arm64/link: running clang failed: exit status 1
ld: warning: ignoring file /tmp/go-link-478913935/go.o, building for macOS-arm64 but attempting to link with file built for unknown-x86_64
Undefined symbols for architecture arm64:
  "_main", referenced from:
     implicit entry/start for main executable
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[eliasnaur]

Duplicate of #43343?

[enty8080]

@eliasnaur Sorry