Don't include mDNS support on platforms other than Linux

Test: Shamu build now passes
Bug: None
(cherry picked from 122a7738606d854d6dc10fa361c1d7296cc9670a)

Change-Id: I650adf0bca96fb655163f5e9b27d9995ae448ec2

adb/Android.mk

@@ -144,19 +144,22 @@ LOCAL_CFLAGS_linux := $(LIBADB_linux_CFLAGS)
 LOCAL_CFLAGS_darwin := $(LIBADB_darwin_CFLAGS)
 LOCAL_SRC_FILES := \
     $(LIBADB_SRC_FILES) \
-    adb_auth_host.cpp \
-    transport_mdns.cpp
+    adb_auth_host.cpp
 
 LOCAL_SRC_FILES_darwin := $(LIBADB_darwin_SRC_FILES)
 LOCAL_SRC_FILES_linux := $(LIBADB_linux_SRC_FILES)
 LOCAL_SRC_FILES_windows := $(LIBADB_windows_SRC_FILES)
 
+LOCAL_SRC_FILES_linux += transport_mdns.cpp
+LOCAL_SRC_FILES_darwin += transport_mdns_unsupported.cpp
+LOCAL_SRC_FILES_windows += transport_mdns_unsupported.cpp
+
 LOCAL_SANITIZE := $(adb_host_sanitize)
 
 # Even though we're building a static library (and thus there's no link step for
 # this to take effect), this adds the includes to our path.
-LOCAL_STATIC_LIBRARIES := libcrypto_utils libcrypto libbase libmdnssd
-LOCAL_STATIC_LIBRARIES_linux := libusb
+LOCAL_STATIC_LIBRARIES := libcrypto_utils libcrypto libbase
+LOCAL_STATIC_LIBRARIES_linux := libusb libmdnssd
 LOCAL_STATIC_LIBRARIES_darwin := libusb
 
 LOCAL_C_INCLUDES_windows := development/host/windows/usb/api/
@@ -225,10 +228,9 @@ LOCAL_STATIC_LIBRARIES := \
     libcrypto \
     libcutils \
     libdiagnose_usb \
-    libgmock_host \
-    libmdnssd \
+    libgmock_host
 
-LOCAL_STATIC_LIBRARIES_linux := libusb
+LOCAL_STATIC_LIBRARIES_linux := libusb libmdnssd
 LOCAL_STATIC_LIBRARIES_darwin := libusb
 
 # Set entrypoint to wmain from sysdeps_win32.cpp instead of main
@@ -293,12 +295,11 @@ LOCAL_STATIC_LIBRARIES := \
     libcrypto_utils \
     libcrypto \
     libdiagnose_usb \
-    liblog \
-    libmdnssd \
+    liblog
 
 # Don't use libcutils on Windows.
 LOCAL_STATIC_LIBRARIES_darwin := libcutils
-LOCAL_STATIC_LIBRARIES_linux := libcutils
+LOCAL_STATIC_LIBRARIES_linux := libcutils libmdnssd
 
 LOCAL_STATIC_LIBRARIES_darwin += libusb
 LOCAL_STATIC_LIBRARIES_linux += libusb

adb/transport_mdns_unsupported.cpp

@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+/* For when mDNS discovery is unsupported */
+void init_mdns_transport_discovery(void) {}