android不能只編譯靜態庫

android NDK內建例子：twolibs，如果只編譯 static lib，出現不編譯情況。如下注釋掉 shared lib。
------------------------------------------------------------------------------ 
LOCAL_PATH:= $(call my-dir) 

# first lib, which will be built statically 
# 
include $(CLEAR_VARS) 

LOCAL_MODULE    := libtwolib-first 
LOCAL_SRC_FILES := first.c 

include $(BUILD_STATIC_LIBRARY) 

# second lib, which will depend on and include the first one 
# 
#include $(CLEAR_VARS) 

LOCAL_MODULE    := libtwolib-second 
#LOCAL_SRC_FILES := second.c 

LOCAL_STATIC_LIBRARIES := libtwolib-first 

#include $(BUILD_SHARED_LIBRARY) 
------------------------------------------------------------------------------ 

這是因為：

By default, the build system will only build the shared libraries listed in your Android.mk, and the modules they depend on.

You can force a static library to be built by defining APP_MODULES in your Application.mk, listing all the modules you wantto build explicitely. In your case, this would be: APP_MODULES := libtwolib-first

To only build the static library.