rust: Bundle Rust shared dependencies in fuzzers

Rust shared library dependencies are not always bundled in cc_fuzz or
rust_fuzz modules, which can lead to difficult to debug runtime errors
when running these fuzzers. It can also be hard to determine which
dependencies need to be explicitly declared.

This CL makes sure that we bundle the appropriate transitive
dependencies for our fuzzers.

Bug: 249551848
Test: Soong tests
Test: m <fuzzer> # check data/fuzz/<arch>/lib dir contents
Change-Id: I957ca8898079b61e2ff20d750f8c92bf61ac394f

1 files changed, 9 insertions, 0 deletions

diff --git a/rust/rust.go b/rust/rust.go
index 4324ecbb9..e524c9fb6 100644
--- a/rust/rust.go
+++ b/rust/rust.go
@@ -631,6 +631,15 @@ func (mod *Module) CcLibraryInterface() bool {
 	return false
 }
 
+func (mod *Module) RustLibraryInterface() bool {
+	if mod.compiler != nil {
+		if _, ok := mod.compiler.(libraryInterface); ok {
+			return true
+		}
+	}
+	return false
+}
+
 func (mod *Module) IsFuzzModule() bool {
 	if _, ok := mod.compiler.(*fuzzDecorator); ok {
 		return true