Rust: Vendor support for Rust static libraries.

We don't have Rust VNDK support yet, but static linkage can be
supported in the interim. This adds support for making rust_ffi_static
libraries available to CC vendor modules.

Since rust_ffi_static modules will link against rlibs, we allow rlib
linkage into vendor as well, but only for the variants which use the
rlib libstd.

Bug: 172525289
Test: New Soong tests pass
Test: Example vendor cc_binary links against rust_ffi_static module.
Change-Id: Idf3aeb51e32293866f1ad965e329aa6b9e0bf2ef
diff --git a/rust/image_test.go b/rust/image_test.go
new file mode 100644
index 0000000..025b0fd
--- /dev/null
+++ b/rust/image_test.go
@@ -0,0 +1,73 @@
+// Copyright 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package rust
+
+import (
+	"testing"
+
+	"android/soong/android"
+	"android/soong/cc"
+)
+
+// Test that cc_binaries can link against rust_ffi_static libraries.
+func TestVendorLinkage(t *testing.T) {
+	ctx := testRust(t, `
+			cc_binary {
+				name: "fizz_vendor",
+				static_libs: ["libfoo_vendor"],
+				soc_specific: true,
+			}
+			rust_ffi_static {
+				name: "libfoo_vendor",
+				crate_name: "foo",
+				srcs: ["foo.rs"],
+				vendor_available: true,
+			}
+		`)
+
+	vendorBinary := ctx.ModuleForTests("fizz_vendor", "android_arm64_armv8-a").Module().(*cc.Module)
+
+	if !android.InList("libfoo_vendor", vendorBinary.Properties.AndroidMkStaticLibs) {
+		t.Errorf("vendorBinary should have a dependency on libfoo_vendor")
+	}
+}
+
+// Test that shared libraries cannot be made vendor available until proper support is added.
+func TestForbiddenVendorLinkage(t *testing.T) {
+	testRustError(t, "vendor_available can only be set for rust_ffi_static modules", `
+		rust_ffi_shared {
+			name: "libfoo_vendor",
+			crate_name: "foo",
+			srcs: ["foo.rs"],
+			vendor_available: true,
+		}
+	`)
+	testRustError(t, "Rust vendor specific modules are currently only supported for rust_ffi_static modules.", `
+		rust_ffi {
+			name: "libfoo_vendor",
+			crate_name: "foo",
+			srcs: ["foo.rs"],
+			vendor: true,
+		}
+	`)
+	testRustError(t, "Rust vendor specific modules are currently only supported for rust_ffi_static modules.", `
+		rust_library {
+			name: "libfoo_vendor",
+			crate_name: "foo",
+			srcs: ["foo.rs"],
+			vendor: true,
+		}
+	`)
+}