rust: add shared library testcase for "objects"

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

test cases/rust/27 objects/lib1-dylib.rs

@@ -0,0 +1,15 @@
+extern "C" {
+    fn from_lib1();
+}
+
+#[no_mangle]
+extern "C" fn from_lib2()
+{
+    println!("hello world from rust");
+}
+
+#[no_mangle]
+pub extern "C" fn c_func()
+{
+    unsafe { from_lib1(); }
+}

test cases/rust/27 objects/meson.build

@@ -16,3 +16,13 @@ executable('lib1objs_as_dep', 'main.rs',
 executable('lib2objs_as_dep', 'main.rs',
   dependencies: dep2,
   link_with: lib1)
+
+lib12 = shared_library('dylib2objs', 'lib1-dylib.rs',
+  objects: lib2.extract_all_objects(recursive: false),
+  rust_abi: 'c')
+executable('dylib', 'main.rs', link_with: lib12)
+
+lib12 = shared_library('dylib2objs_as_dep', 'lib1-dylib.rs',
+  dependencies: dep2,
+  rust_abi: 'c')
+executable('dylib_as_dep', 'main.rs', link_with: lib12)