Restore dummy libdl.a implementation

Bug: http://b/36206043
Test: bionic-unit-tests-static
Change-Id: If0400b72b51570e5ca0d70ec0bd9fb77664b9210

libdl/Android.bp

@@ -44,7 +44,12 @@ cc_library {
             version_script: "libdl.x86_64.map",
         },
     },
-    srcs: ["libdl.c", "libdl_cfi.cpp"],
+    shared: {
+        srcs: ["libdl.c", "libdl_cfi.cpp"],
+    },
+    static: {
+        srcs: [ "libdl_static.c" ],
+    },
     cflags: [
         "-Wall",
         "-Wextra",

libdl/libdl_static.c

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2007 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.
+ */
+
+#include <dlfcn.h>
+#include <link.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+// Proxy calls to bionic loader
+void* dlopen(const char* filename __unused, int flag __unused) {
+  return NULL;
+}
+
+char* dlerror() {
+  return NULL;
+}
+
+void* dlsym(void* handle __unused, const char* symbol __unused) {
+  return NULL;
+}
+
+void* dlvsym(void* handle __unused,
+             const char* symbol __unused,
+             const char* version __unused) {
+  return NULL;
+}
+
+int dladdr(const void* addr __unused, Dl_info* info __unused) {
+  return 0;
+}
+
+int dlclose(void* handle __unused) {
+  return -1;
+}
+
+#if defined(__arm__)
+_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc __unused, int* pcount __unused) {
+  return 0;
+}
+#endif
+
+void android_set_application_target_sdk_version(uint32_t target __unused) {
+}
+