go: cmd/go, x/vgo: compilation errors upon building

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

go version go1.11beta2 darwin/amd64

Does this issue reproduce with the latest release?

This is happening with the latest release.

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

GOARCH=“amd64” GOBIN=“” GOCACHE=“/Users/myusername/Library/Caches/go-build” GOEXE=“” GOHOSTARCH=“amd64” GOHOSTOS=“darwin” GOOS=“darwin” GOPATH=“/Users/myusername/OneDrive/gocode” GOPROXY=“” GORACE=“” GOROOT=“/usr/local/go” GOTMPDIR=“” GOTOOLDIR=“/usr/local/go/pkg/tool/darwin_amd64” GCCGO=“gccgo” CC=“clang” CXX=“clang++” CGO_ENABLED=“1” GOMOD=“” 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 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/9x/xp9y18vx58q815_7fp24cf5c0000gn/T/go-build936526924=/tmp/go-build -gno-record-gcc-switches -fno-common”

What did you do?

I just now upgraded from version go1.11beta1 to go1.11beta2.

I’m trying to build a program using the vgo build command, and I’m getting a bunch of errors and failures after the “go.mod” file is built. It doesn’t look like it’s something particularly due to the packages being included, since this issue occurs with a couple other packages I tried to build.

What did you expect to see?

A successful build.

What did you see instead?

It looks like a few internal packages are not being compiled correctly. There are a lot of “redeclared in this block” errors.

Here’s a copy of the complete output by the vgo build command:

$ vgo build
vgo: creating new go.mod: module github.com/dchenk/go-graph-fb
# runtime/internal/sys
/usr/local/go/src/runtime/internal/sys/arch_wasm.go:8:2: ArchFamily redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/sys/arch_amd64.go:8:24
/usr/local/go/src/runtime/internal/sys/arch_wasm.go:9:2: BigEndian redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/sys/arch_amd64.go:9:24
/usr/local/go/src/runtime/internal/sys/arch_wasm.go:10:2: CacheLineSize redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/sys/arch_amd64.go:10:24
/usr/local/go/src/runtime/internal/sys/arch_wasm.go:11:2: DefaultPhysPageSize redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/sys/arch_amd64.go:11:24
/usr/local/go/src/runtime/internal/sys/arch_wasm.go:12:2: PCQuantum redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/sys/arch_amd64.go:12:24
/usr/local/go/src/runtime/internal/sys/arch_wasm.go:13:2: Int64Align redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/sys/arch_amd64.go:13:24
/usr/local/go/src/runtime/internal/sys/arch_wasm.go:14:2: HugePageSize redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/sys/arch_amd64.go:14:29
/usr/local/go/src/runtime/internal/sys/arch_wasm.go:15:2: MinFrameSize redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/sys/arch_amd64.go:15:24
/usr/local/go/src/runtime/internal/sys/arch_wasm.go:18:6: Uintreg redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/sys/arch_amd64.go:18:6
# internal/cpu
/usr/local/go/src/internal/cpu/cpu_x86.go:9:7: CacheLineSize redeclared in this block
	previous declaration at /usr/local/go/src/internal/cpu/cpu_wasm.go:7:23
# runtime/internal/atomic
/usr/local/go/src/runtime/internal/atomic/atomic_wasm.go:14:6: Load redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/atomic/atomic_amd64x.go:13:24
/usr/local/go/src/runtime/internal/atomic/atomic_wasm.go:20:6: Loadp redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/atomic/atomic_amd64x.go:19:32
/usr/local/go/src/runtime/internal/atomic/atomic_wasm.go:26:6: Load64 redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/atomic/atomic_amd64x.go:25:26
/usr/local/go/src/runtime/internal/atomic/atomic_wasm.go:32:6: Xadd redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/atomic/atomic_amd64x.go:30:37
/usr/local/go/src/runtime/internal/atomic/atomic_wasm.go:40:6: Xadd64 redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/atomic/atomic_amd64x.go:33:39
/usr/local/go/src/runtime/internal/atomic/atomic_wasm.go:48:6: Xadduintptr redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/atomic/atomic_amd64x.go:36:47
/usr/local/go/src/runtime/internal/atomic/atomic_wasm.go:56:6: Xchg redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/atomic/atomic_amd64x.go:39:36
/usr/local/go/src/runtime/internal/atomic/atomic_wasm.go:64:6: Xchg64 redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/atomic/atomic_amd64x.go:42:38
/usr/local/go/src/runtime/internal/atomic/atomic_wasm.go:72:6: Xchguintptr redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/atomic/atomic_amd64x.go:45:45
/usr/local/go/src/runtime/internal/atomic/atomic_wasm.go:80:6: And8 redeclared in this block
	previous declaration at /usr/local/go/src/runtime/internal/atomic/atomic_amd64x.go:48:27
/usr/local/go/src/runtime/internal/atomic/atomic_wasm.go:80:6: too many errors