Bump to go1.8.1 and remove the edge GOROOT

build/build-image/cross/Dockerfile

@@ -15,7 +15,7 @@
 # This file creates a standard build environment for building cross
 # platform go binary for the architecture kubernetes cares about.
 
-FROM golang:1.7.5
+FROM golang:1.8.1
 
 ENV GOARM 7
 ENV KUBE_DYNAMIC_CROSSPLATFORMS \
@@ -77,12 +77,3 @@ RUN export ETCD_VERSION=v3.0.17; \
   && cd /usr/local/src/etcd \
   && curl -fsSL https://github.com/coreos/etcd/releases/download/${ETCD_VERSION}/etcd-${ETCD_VERSION}-linux-amd64.tar.gz | tar -xz \
   && ln -s ../src/etcd/etcd-${ETCD_VERSION}-linux-amd64/etcd /usr/local/bin/
-
-# TODO: Remove the need for two golang versions; when we use go1.8 for all other builds we can remove this
-ENV K8S_GOLANG_EDGE_VERSION=1.8.1 \
-    K8S_EDGE_GOROOT=/usr/local/go_k8s_edge
-RUN mkdir -p ${K8S_EDGE_GOROOT} \
-  && curl -sSL https://golang.org/dl/go${K8S_GOLANG_EDGE_VERSION}.linux-amd64.tar.gz | tar -xz -C ${K8S_EDGE_GOROOT} --strip-components=1
-
-# Prebuild the standard library for those platforms that need the edge GOROOT
-RUN for platform in linux/arm linux/ppc64le; do GOOS=${platform%/*} GOARCH=${platform##*/} GOROOT=${K8S_EDGE_GOROOT} go install std; done

build/build-image/cross/VERSION

@@ -1 +1 @@
-v1.7.5-3
+v1.8.1-1