没有规则来制作目标NDK

Question

我正在编译本机源并使用.a libs添加依赖项以及具有以下结构的相关头文件.

/ JNI /

Android.mk

LOCAL_PATH := $(call my-dir)
include $(call all-subdir-makefiles)

include $(CLEAR_VARS)

LOCAL_LDLIBS := -llog
LOCAL_MODULE    := ndk1
LOCAL_SRC_FILES := native.c
LOCAL_STATIC_LIBRARY := mschema 
include $(BUILD_SHARED_LIBRARY)

native.c

/ JNI/prereqs /

Android.mk

LOCAL_PATH := $(call my-dir)

include $(call all-subdir-makefiles)

include $(CLEAR_VARS)

- 用于调用子文件夹mk文件

/ JNI/prereqs/mschema /

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    :=mschema
LOCAL_SRC_FILES :=libmschema.a
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include

include $(PREBUILT_STATIC_LIBRARY)

libmschema.a

/ JNI/prereqs/mschema /包括

头文件.(.H)

但在尝试ndk-build(NDK5)时遇到以下错误.

marcos@marcos-AY675AA-AC4-s5320br:~/dev/workspace/rmsdk.native.wraper$ ndk-buildmake:
 *** No rule to make target `/home/marcos/dev/workspace/rmsdk.native.wraper/jni/prereqs/mschema/native.c', needed by `/home/marcos/dev/workspace/rmsdk.native.wraper/obj/local/armeabi/objs/ndk1/native.o'.  Stop.

键入时我注意到错误是关于/home/marcos/dev/workspace/rmsdk.native.wraper/jni/prereqs/mschema/native.c' and actually this file is under/home/marcos/dev/workspace/rmsdk.native.wraper/jni/native.c',我的make文件有什么问题？

将第一个Android.mk更改为以下内容可以避免此问题:

LOCAL_PATH := $(call my-dir)
include $(call all-subdir-makefiles)
LOCAL_PATH :=/home/marcos/dev/workspace/rmsdk.native.wraper/jni
include $(CLEAR_VARS)
LOCAL_LDLIBS := -llog
LOCAL_MODULE    := ndk1
LOCAL_SRC_FILES := native.c
LOCAL_STATIC_LIBRARY := mschema
include $(BUILD_SHARED_LIBRARY)

但它看起来不对.有更好的方法吗？

Answer 1

从NDK 5中的Docs,解决方案是创建一个局部变量..

my-dir返回最后包含的Makefile的路径,该文件通常是当前的Android.mk目录.这对于在Android.mk的开头定义LOCAL_PATH很有用,如下所示:

    LOCAL_PATH := $(call my-dir)

IMPORTANT NOTE: Due to the way GNU Make works, this really returns
the path of the *last* *included* *Makefile* during the parsing of
build scripts. Do not call my-dir after including another file.

所以..解决这个问题我将Android.mk更改为以下内容.

 LOCAL_PATH := $(call my-dir)
 MY_PATH := $(LOCAL_PATH)
 include $(call all-subdir-makefiles)

 include $(CLEAR_VARS)

 LOCAL_PATH := $(MY_PATH)

 LOCAL_LDLIBS := -llog -ldl
 LOCAL_MODULE    := rmsdk
 LOCAL_SRC_FILES := native.c

 include $(BUILD_SHARED_LIBRARY)

它的作品.