Answering my own question :-)
Think I found what I need in the Maven plugin docs:
"
Normally this plug-in executes the protoc compilation on every
execution
this can be overriden by setting:
<checkStaleness>true</checkStaleness>
"
>From https://github.com/dtrott/maven-protoc-plugin#readme
On May 25, 9:43 pm, Maurice Nicholson <[email protected]>
wrote:
> Hi all,
>
> is there an option for protoc to only generate files if the target
> generated sources are out of date? (Currently it seems as if they are
> always regenerated).
>
> We actually use Maven with the maven-protoc-plugin to build our
> project, but I believe that's simply a wrapper around protoc itself.
>
> Thanks,
> Maurice
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