vendor/cmd/go/testdata/script/build_GOTMPDIR.txt

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

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