android不能只编译静态库

android NDK自带例子：twolibs，如果只编译 static lib，出现不编译情况。如下注释掉 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) 
------------------------------------------------------------------------------ 

这是因为：

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 want

to build explicitely. In your case, this would be:

 

APP_MODULES := libtwolib-first

To only build the static library.