src/cmd/go/testdata/script/build_plugin_reproducible.txt

[!buildmode:plugin] skip
[short] skip
[!cgo] skip '-buildmode=plugin requires external linking'

go build -trimpath -buildvcs=false -buildmode=plugin -o a.so main.go
go build -trimpath -buildvcs=false -buildmode=plugin -o b.so main.go
cmp -q a.so b.so

-- main.go --
package main

func main() {}