We want annotationProcessors to be compiled and archived into a JAR at
build time, ready to generate JNI wrappers. (That is, until we turn
the whole thing into a real annotation processor.) But even if we do
use a real annotation processor, we still need to generate SDK
bindings, which is less clearly expressed as an annotation processor.
(It's more of a build step.)
Gradle provides a huge number of ways to organize build logic to
achieve this: see
https://docs.gradle.org/current/userguide/organizing_build_logic.html.
Unfortunately, the best such way -- putting the code into
$topsrcdir/buildSrc -- has key disadvantages:
1) it pollutes the top-level $topsrcdir, and there's no way to change the
location of buildSrc (https://github.com/gradle/gradle/issues/2472);
2) it's complicated to have a dependent project
(mobile/android/annotations) expose its code via a buildSrc project;
3) using buildSrc at all appears to conflict with the Android-Gradle
plugin version that we are using.
Therefore, this commit does something much simpler: it adds a
Java-only project and uses the resulting Gradle "Jar" task and archive
output as input to the existing Gradle "generate JNI wrappers" task.
MozReview-Commit-ID: 2OyYLPneE1M
--HG--
extra : rebase_source : d99b74a0a1e0bb3e8f4d4540978328388e5c2e42
Agi Sferro
Nick Alexander