tree eb2e9e0032c8bf30ee1ef13b90fa35a76a212c6b
parent 66500913f069a9393d5d7ca9ca4b735b8ab0ad9b
author Joe Tsai <joetsai@digital-static.net> 1558556871 -0400
committer Joe Tsai <joetsai@digital-static.net> 1558634032 +0000

cmd/protoc-gen-go, runtime/protoimpl: enforce minimum and maximum versions

Generate the needed infrastructure to ensure that we can statically
enforce minimum and maximum versions. This enables us to have a policy
when we release v2 where it fails to build for:
* new generated code with really old runtimes
* new runtimes with really old generated code

Change-Id: Ib699ad62c06dff8f9285806394a741c18db00288
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/178546
Reviewed-by: Damien Neil <dneil@google.com>