fix zap issue, we should not add unneed functions in zap but fix unde…

…fined issue

build/config/compiler/BUILD.gn

@@ -435,6 +435,11 @@ config("size_default") {
     "-ffunction-sections",
     "-fdata-sections",
   ]
+
+  # do not export functions in jni, or --gc-sections will not work and will be some undefined issues
+  if (current_os == "android") {
+    cflags += [ "-fvisibility=hidden" ]
+  }
 }
 
 config("stack_protector_default") {

src/app/server/java/BUILD.gn

@@ -43,6 +43,8 @@ shared_library("jni") {
   public_configs = [ "${chip_root}/src:includes" ]
 
   output_dir = "${root_out_dir}/lib/jni/${android_abi}"
+
+  ldflags = [ "-Wl,--gc-sections" ]
 }
 
 android_library("java") {

src/controller/CHIPDevice.h

@@ -105,7 +105,7 @@ typedef void (*OnDeviceConnected)(void * context, Device * device);
 typedef void (*OnDeviceConnectionFailure)(void * context, NodeId deviceId, CHIP_ERROR error);
 typedef void (*OnOpenCommissioningWindow)(void * context, NodeId deviceId, CHIP_ERROR status, SetupPayload payload);
 
-class DLL_EXPORT Device : public Messaging::ExchangeDelegate, public SessionEstablishmentDelegate
+class Device : public Messaging::ExchangeDelegate, public SessionEstablishmentDelegate
 {
 public:
     ~Device();
@@ -588,7 +588,7 @@ class DLL_EXPORT Device : public Messaging::ExchangeDelegate, public SessionEsta
  * Device when a new message or status update is received from the corresponding
  * CHIP device.
  */
-class DLL_EXPORT DeviceStatusDelegate
+class DeviceStatusDelegate
 {
 public:
     virtual ~DeviceStatusDelegate() {}

src/controller/java/BUILD.gn

@@ -42,6 +42,8 @@ shared_library("jni") {
   public_configs = [ "${chip_root}/src:includes" ]
 
   output_dir = "${root_out_dir}/lib/jni/${android_abi}"
+
+  ldflags = [ "-Wl,--gc-sections" ]
 }
 
 android_library("java") {