Enable transformation spec for rust with link groups

Summary:
Transformation specs should also be available for Rust (mostly to migrate off link group-based APIs that is currently rolled out for rust too). Thankfully this is easy to configure because all we should do is to propagate the values and all handling will work out of the box.

Passing transformation spec context to part that handles link groups

Reviewed By: dtolnay

Differential Revision: D83559462

fbshipit-source-id: f6095b7e81bdc1ebec58b77f7b78643bdcad2eee

Author: Nikita Patskov

prelude/rust/link_info.bzl

@@ -40,6 +40,10 @@ load(
     "@prelude//cxx:link_groups_types.bzl",
     "LinkGroupInfo",  # @unused Used as a type
 )
+load(
+    "@prelude//cxx:transformation_spec.bzl",
+    "TransformationSpecContext",  # @unused Used as a type
+)
 load(
     "@prelude//linking:link_groups.bzl",
     "LinkGroupLib",  # @unused Used as a type
@@ -411,7 +415,8 @@ def inherited_third_party_builds(ctx: AnalysisContext, dep_ctx: DepCollectionCon
 def inherited_rust_cxx_link_group_info(
         ctx: AnalysisContext,
         dep_ctx: DepCollectionContext,
-        link_strategy: LinkStrategy) -> RustCxxLinkGroupInfo | None:
+        link_strategy: LinkStrategy,
+        transformation_spec_context: TransformationSpecContext | None) -> RustCxxLinkGroupInfo | None:
     # Check minimum requirements
     if not cxx_is_gnu(ctx) or not ctx.attrs.auto_link_groups:
         return None
@@ -467,6 +472,7 @@ def inherited_rust_cxx_link_group_info(
         prefer_stripped_objects = False,  # Does Rust ever use stripped objects?
         anonymous = ctx.attrs.anonymous_link_groups,
         public_nodes = public_link_group_nodes,
+        transformation_spec_context = transformation_spec_context,
     )
 
     auto_link_groups = {}

prelude/rust/rust_binary.bzl

@@ -149,10 +149,14 @@ def _rust_binary_common(
         predeclared_output = ctx.actions.declare_output(name)
         final_output = predeclared_output
 
+    build_graph_info = new_build_graph_info(ctx, cxx_deps)
+    transformation_spec_context = build_transformation_spec_context(ctx, build_graph_info)
+
     rust_cxx_link_group_info = inherited_rust_cxx_link_group_info(
         ctx,
         compile_ctx.dep_ctx,
         link_strategy = link_strategy,
+        transformation_spec_context = transformation_spec_context,
     )
     if rust_cxx_link_group_info != None:
         link_group_mappings = rust_cxx_link_group_info.link_group_info.mappings
@@ -183,9 +187,6 @@ def _rust_binary_common(
         targets_consumed_by_link_groups = targets_consumed_by_link_groups,
     )
 
-    build_graph_info = new_build_graph_info(ctx, cxx_deps)
-    transformation_spec_context = build_transformation_spec_context(ctx, build_graph_info)
-
     # Gather and setup symlink tree of transitive shared library deps.
     shared_libs = build_shared_libs_for_symlink_tree(
         use_link_groups = rust_cxx_link_group_info != None,