android - 链接预构建的静态库ndk与Android源代码

我最近发现，从ndk构建中链接预先构建的静态库与在android源代码树（mm）中链接完全不同。为什么会这样？

   // main.cpp
   #include <stdio.h>
   #include "doubler.hpp"

    int main()
    {
       printf("test a static lib \n");

       // library function
       doubler *p = new doubler();
       delete p;

       return 0;
    }

Android MK：

LOCAL_PATH := $(call my-dir)

###################### static lib ##################
### prebuilt lib works in NDK but not Android src
#include $(CLEAR_VARS)
#LOCAL_MODULE := doubleIt_prebuilt
#LOCAL_SRC_FILES :=  $(LOCAL_PATH)/libDoubler.a
#LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)
##LOCAL_SRC_FILES :=  libDoubler.a
#include $(PREBUILT_STATIC_LIBRARY)

###################### test app ##################
include $(CLEAR_VARS)

# binary name
LOCAL_MODULE:= testApp

# c++ file extension
LOCAL_CPP_EXTENSION := .cpp

# src files
LOCAL_SRC_FILES := main.cpp

# include dir
LOCAL_C_INCLUDES := $(LOCAL_PATH)

### this works in Android src, but not in NDK
LOCAL_LDLIBS := -L$(LOCAL_PATH) -lDoubler

### prebuilt lib works in NDK but not Android src
#LOCAL_STATIC_LIBRARIES := doubleIt_prebuilt

#what to build
include $(BUILD_EXECUTABLE)

最后，在src树中链接静态库的正确方法是什么？

最佳答案

为什么会这样？
ndk构建和aosp构建系统是两个完全不同的构建系统，不幸的是它们看起来非常相似。
最后，在src树中链接静态库的正确方法是什么？
在AOSP树上？预构建模块的定义不同。下面是几个例子：
https://android.googlesource.com/platform/prebuilts/sdk/+/9c011b3a7784803b96dc0f0a840aa9033a0cd62a/tools/Android.mk#291

include $(CLEAR_VARS)
LOCAL_MODULE := libbcc
LOCAL_SRC_FILES := $(HOST_OS)/lib64/$(LOCAL_MODULE)$(HOST_SHLIB_SUFFIX)
LOCAL_MODULE_CLASS := SHARED_LIBRARIES
LOCAL_MODULE_TAGS := optional
LOCAL_MODULE_SUFFIX := $(HOST_SHLIB_SUFFIX)
LOCAL_IS_HOST_MODULE := true
LOCAL_MULTILIB := 64
include $(BUILD_PREBUILT)

https://android.googlesource.com/platform/development/+/518e6c3a28cc63fd094c8b255e268650b03fdab5/host/windows/prebuilt/usb/Android.mk

include $(CLEAR_VARS)
LOCAL_IS_HOST_MODULE := true
LOCAL_MODULE := AdbWinApi
LOCAL_MODULE_CLASS := STATIC_LIBRARIES
LOCAL_SRC_FILES_x86 := AdbWinApi.a
LOCAL_MODULE_SUFFIX := .a
LOCAL_MULTILIB := 32
LOCAL_MODULE_HOST_OS := windows
include $(BUILD_PREBUILT)

然后，您可以像使用其他库一样使用它们：LOCAL_STATIC_LIBRARIES := libmyprebuilt。以上两个示例都是针对主机模块的。对于目标模块，只需删除该行即可。
请注意，aosp的新（仍在进行中）构建系统soong还没有对预构建模块的支持。现在只能在android.mk文件中定义。