x/sys: SYS___SYSCTL is not defined on darwin/arm

[steeve]

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

go version go1.9.1 darwin/amd64

Does this issue reproduce with the latest release?

Yes

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

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/steeve/go"
GORACE=""
GOROOT="/usr/local/Cellar/go/1.9.1/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.9.1/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/bs/51dlb_nn5k35xq9qfsxv9wc00000gr/T/go-build313305023=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"

What did you do?

Try and build a package using golang.org/x/syscall.SYS___SYSCTL on darwin/arm

What did you expect to see?

A successful build.

What did you see instead?

Build fails with error:

vendor/golang.org/x/sys/unix/zsyscall_darwin_arm.go:224:23: undefined: SYS___SYSCTL

[bradfitz]

/cc @tklauser

[gopherbot]

Change https://golang.org/cl/79155 mentions this issue: unix: add SYS___SYSCTL on darwin/arm