tree 4fbbe3e5d069017a6c4bc3f17dc9dc7c8e936cb6
parent 691d8563c7d45befaba878dd61cf58640e2e48e7
author Joe Tsai <joetsai@digital-static.net> 1554756734 -0700
committer Joe Tsai <joetsai@digital-static.net> 1563216252 +0000

all: implement proto1 weak fields

This implements generation of and reflection support for weak fields.
Weak fields are a proto1 feature where the "weak" option can be specified
on a singular message field. A weak reference results in generated code
that does not directly link in the dependency containing the weak message.

Weak field support is not added to any of the serialization logic.

Change-Id: I08ccfa72bc80b2ffb6af527a1677a0a81dcf33fb
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/185399
Reviewed-by: Damien Neil <dneil@google.com>