cmd/go: install -a fails if GOROOT is not writeable #5065
Description
Currently 'go install -a' fails when run for packages under GOPATH, if the GOROOT is not writeable: $ sudo tar -C /usr/local -xzf go1.0.3.linux-amd64.tar.gz $ echo $GOPATH /home/jsing/src/mygo $ go install -a example go install runtime: open /usr/local/go/pkg/linux_amd64/runtime.a: permission denied Obviously '-a' means all, however it would be useful if we could force a rebuild for all of the dependencies under the GOPATH only (or skip dependencies in GOROOT).