env GO111MODULE=on

# Set up fresh GOCACHE.
env GOCACHE=$WORK/gocache
mkdir $GOCACHE

cd $WORK
go build -o a.out

# Varying -trimpath should cause a rebuild.
go build -x -o a.out -trimpath
stderr '(compile|gccgo)( |\.exe)'
stderr 'link( |\.exe)'

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

-- $WORK/go.mod --
module m