问题描述
我正在编译原生源代码并使用 .a 库和具有以下结构的相关头文件添加依赖项.
/jni/
<块引用>Android.mk
LOCAL_PATH := $(call my-dir)包括 $(调用所有子目录生成文件)包括 $(CLEAR_VARS)LOCAL_LDLIBS := -llog本地模块:= ndk1LOCAL_SRC_FILES := native.cLOCAL_STATIC_LIBRARY := mschema包括 $(BUILD_SHARED_LIBRARY)<块引用>
native.c
/jni/prereqs/
<块引用>Android.mk
LOCAL_PATH := $(call my-dir)包括 $(调用所有子目录生成文件)包括 $(CLEAR_VARS)--用于调用子文件夹mk文件
/jni/prereqs/mschema/
<块引用>Android.mk
LOCAL_PATH := $(call my-dir)包括 $(CLEAR_VARS)LOCAL_MODULE :=mschemaLOCAL_SRC_FILES :=libmschema.aLOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include包括 $(PREBUILT_STATIC_LIBRARY)<块引用>
libmschema.a
/jni/prereqs/mschema/include
<块引用>头文件.(.h)
但在尝试 ndk-build (NDK5) 时出现以下错误.
marcos@marcos-AY675AA-AC4-s5320br:~/dev/workspace/rmsdk.native.wraper$ ndk-buildmake:*** 没有规则来制作目标 `/home/marcos/dev/workspace/rmsdk.native.wraper/jni/prereqs/mschema/native.c'，需要 `/home/marcos/dev/workspace/rmsdk.native.wraper/obj/local/armeabi/objs/ndk1/native.o'.停止.在打字时我注意到错误是关于 /home/marcos/dev/workspace/rmsdk.native.wraper/jni/prereqs/mschema/native.c' 而实际上这个文件在/home/marcos/dev/workspace/rmsdk.native.wraper/jni/native.c'，我的make文件有什么问题?
可以通过将第一个 Android.mk 更改为以下内容来避免该问题:
LOCAL_PATH := $(call my-dir)包括 $(调用所有子目录生成文件)LOCAL_PATH :=/home/marcos/dev/workspace/rmsdk.native.wraper/jni包括 $(CLEAR_VARS)LOCAL_LDLIBS := -llog本地模块:= ndk1LOCAL_SRC_FILES := native.cLOCAL_STATIC_LIBRARY := mschema包括 $(BUILD_SHARED_LIBRARY)但它看起来不对.有更好的方法吗?
从 NDK 5 的 Docs 中，解决方案是创建一个局部变量..
我的目录返回最后包含的 Makefile 的路径，通常是当前 Android.mk 的目录.这有助于定义LOCAL_PATH 在您的 Android.mk 开头，如下所示:
LOCAL_PATH := $(call my-dir)重要提示:由于 GNU Make 的工作方式，这确实返回*last* *included* *Makefile* 在解析过程中的路径构建脚本.包含另一个文件后不要调用 my-dir.所以.. 为了解决这个问题，我将我的 Android.mk 更改为以下内容.
LOCAL_PATH := $(call my-dir)MY_PATH := $(LOCAL_PATH)包括 $(调用所有子目录生成文件)包括 $(CLEAR_VARS)LOCAL_PATH := $(MY_PATH)LOCAL_LDLIBS := -llog -ldlLOCAL_MODULE := rmsdkLOCAL_SRC_FILES := native.c包括 $(BUILD_SHARED_LIBRARY)及其作品.
I'm compiling native sources and adding the dependencies with .a libs and those relative header files with the following structure.
/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)
--Used to call the sub-folders mk files
/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 $(PREBUILT_STATIC_LIBRARY)
libmschema.a
/jni/prereqs/mschema/include
Header files. (.h)
But while trying to ndk-build (NDK5) I got the following error.
marcos@marcos-AY675AA-AC4-s5320br:~/dev/workspace/rmsdk.native.wraper$ 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.
While typing I noted the error is about /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', what's wrong in my make files?
The problem could be avoided by changing the first Android.mk to the following:
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)
But it looks wrong. Is there a better approach?
From the Docs in NDK 5, the solution is to create a local variable..
my-dir Returns the path of the last included Makefile, which typically is the current Android.mk's directory. This is useful to define LOCAL_PATH at the start of your Android.mk as with:
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.
So.. to solve this problem I change my Android.mk to the following.
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)
And its works.
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