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, 66 insertions, 0 deletions

diff --git a/rust/fuzz_test.go b/rust/fuzz_test.go
index 7fa9f5c8f..0aecf617e 100644
--- a/rust/fuzz_test.go
+++ b/rust/fuzz_test.go
@@ -19,6 +19,7 @@ import (
 	"testing"
 
 	"android/soong/android"
+	"android/soong/cc"
 )
 
 func TestRustFuzz(t *testing.T) {
@@ -59,3 +60,68 @@ func TestRustFuzz(t *testing.T) {
 		t.Errorf("rust_fuzz dependent library does not contain the expected flags (sancov-module, cfg fuzzing).")
 	}
 }
+
+func TestRustFuzzDepBundling(t *testing.T) {
+	ctx := testRust(t, `
+			cc_library {
+				name: "libcc_transitive_dep",
+			}
+			cc_library {
+				name: "libcc_direct_dep",
+			}
+			rust_library {
+				name: "libtest_fuzzing",
+				crate_name: "test_fuzzing",
+				srcs: ["foo.rs"],
+				shared_libs: ["libcc_transitive_dep"],
+			}
+			rust_fuzz {
+				name: "fuzz_libtest",
+				srcs: ["foo.rs"],
+				rustlibs: ["libtest_fuzzing"],
+				shared_libs: ["libcc_direct_dep"],
+			}
+	`)
+
+	fuzz_libtest := ctx.ModuleForTests("fuzz_libtest", "android_arm64_armv8-a_fuzzer").Module().(*Module)
+
+	if !strings.Contains(fuzz_libtest.FuzzSharedLibraries().String(), ":libcc_direct_dep.so") {
+		t.Errorf("rust_fuzz does not contain the expected bundled direct shared libs ('libcc_direct_dep'): %#v", fuzz_libtest.FuzzSharedLibraries().String())
+	}
+	if !strings.Contains(fuzz_libtest.FuzzSharedLibraries().String(), ":libcc_transitive_dep.so") {
+		t.Errorf("rust_fuzz does not contain the expected bundled transitive shared libs ('libcc_transitive_dep'): %#v", fuzz_libtest.FuzzSharedLibraries().String())
+	}
+}
+
+func TestCCFuzzDepBundling(t *testing.T) {
+	ctx := testRust(t, `
+			cc_library {
+				name: "libcc_transitive_dep",
+			}
+			rust_ffi {
+				name: "libtest_fuzzing",
+				crate_name: "test_fuzzing",
+				srcs: ["foo.rs"],
+				shared_libs: ["libcc_transitive_dep"],
+			}
+			cc_fuzz {
+				name: "fuzz_shared_libtest",
+				shared_libs: ["libtest_fuzzing"],
+			}
+			cc_fuzz {
+				name: "fuzz_static_libtest",
+				static_libs: ["libtest_fuzzing"],
+			}
+
+	`)
+
+	fuzz_shared_libtest := ctx.ModuleForTests("fuzz_shared_libtest", "android_arm64_armv8-a_fuzzer").Module().(cc.LinkableInterface)
+	fuzz_static_libtest := ctx.ModuleForTests("fuzz_static_libtest", "android_arm64_armv8-a_fuzzer").Module().(cc.LinkableInterface)
+
+	if !strings.Contains(fuzz_shared_libtest.FuzzSharedLibraries().String(), ":libcc_transitive_dep.so") {
+		t.Errorf("cc_fuzz does not contain the expected bundled transitive shared libs from rust_ffi_shared ('libcc_transitive_dep'): %#v", fuzz_shared_libtest.FuzzSharedLibraries().String())
+	}
+	if !strings.Contains(fuzz_static_libtest.FuzzSharedLibraries().String(), ":libcc_transitive_dep.so") {
+		t.Errorf("cc_fuzz does not contain the expected bundled transitive shared libs from rust_ffi_static ('libcc_transitive_dep'): %#v", fuzz_static_libtest.FuzzSharedLibraries().String())
+	}
+}