# Set GOCACHE to a clean directory to ensure that 'go build' has work to report.
env GOCACHE=$WORK/gocache

# Build should use GOTMPDIR if set.
env GOTMPDIR=$WORK/my-favorite-tmpdir
mkdir $GOTMPDIR
go build -work hello.go
stderr ^WORK=.*my-favorite-tmpdir

-- hello.go --
package main
func main() { println("hello") }