code review 7389049: build: do not set GOBIN on Plan 9

src/run.rc

 #!/bin/rc -e
 # Copyright 2012 The Go Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-eval `{go tool dist env -9}
+rfork e
+
+eval `{go env}
+
+GOPATH = () # we disallow local import for non-local packges, if $GOROOT happens
+            # to be under $GOPATH, then some tests below will fail
 
 # allow all.rc to avoid double-build of everything
 rebuild = true
 if(~ $1 --no-rebuild)
         shift
 if not {
+        # Run only one process at a time on 9vx.
+        if(~ $sysname vx32)
+                pflag = (-p 1)
         echo '# Building packages and commands.'
-        time go install -a -v -p 1 std
+        time go install -a -v $pflag std
         echo
 }
 
+# we must unset GOROOT_FINAL before tests, because runtime/debug requires
+# correct access to source code, so if we have GOROOT_FINAL in effect,
+# at least runtime/debug test will fail.
+GOROOT_FINAL = ()
+
 echo '# Testing packages.'
 time go test std -short -timeout 120s
 echo
 
 echo '# GOMAXPROCS=2 runtime -cpu=1,2,4'
-GOMAXPROCS=2 go test runtime -short -timeout 120s -cpu 1,2,4
+GOMAXPROCS=2 go test runtime -short -timeout 240s -cpu 1,2,4
 echo
 
 echo '# sync -cpu=10'
 go test sync -short -timeout 120s -cpu 10
 echo
 
 fn xcd {
         echo
         echo '#' $1
         cd $"GOROOT/src/$1
 }
 
 echo
 echo '#' ../misc/dashboard/builder ../misc/goplay
 go build ../misc/dashboard/builder ../misc/gplay
 
 echo
 echo '#' ../test/bench/go1
 go test ../test/bench/go1
 
 @{
         xcd ../test
         GOMAXPROCS='' time go run run.go
 }
 
 echo
 echo ALL TESTS PASSED