Add "proto_source_root" flag to proto_library.

Fixes #4544.

RELNOTES: Add "proto_source_root" flag to proto_library.
PiperOrigin-RevId: 185997723

1 files changed, 9 insertions, 1 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/proto/SupportData.java b/src/main/java/com/google/devtools/build/lib/rules/proto/SupportData.java
index da35d13c34..9e02d190d5 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/proto/SupportData.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/proto/SupportData.java
@@ -33,9 +33,11 @@ public abstract class SupportData {
       ImmutableList<Artifact> protoSources,
       NestedSet<Artifact> protosInDirectDeps,
       NestedSet<Artifact> transitiveImports,
+      NestedSet<String> transitiveProtoPathFlags,
       boolean hasProtoSources) {
     return new AutoValue_SupportData(
-        nonWeakDepsPredicate, protoSources, transitiveImports, protosInDirectDeps, hasProtoSources);
+        nonWeakDepsPredicate, protoSources, transitiveImports, protosInDirectDeps,
+        transitiveProtoPathFlags, hasProtoSources);
   }
 
   public abstract Predicate<TransitiveInfoCollection> getNonWeakDepsPredicate();
@@ -49,6 +51,12 @@ public abstract class SupportData {
    */
   public abstract NestedSet<Artifact> getProtosInDirectDeps();
 
+  /**
+   * Directories of .proto sources collected from the transitive closure, each prefixed with
+   * {@code --proto_path}. These flags will be passed to {@code protoc} in the specified oreder.
+   */
+  public abstract NestedSet<String> getTransitiveProtoPathFlags();
+
   public abstract boolean hasProtoSources();
 
   SupportData() {}