I would like to statically link OpenCV(2.4.3.2) to my project. Right now my Android.mk looks like this
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
OPENCV_CAMERA_MODULES:=on
OPENCV_INSTALL_MODULES:=on
include /Users/jamiematthews/Documents/Android-Projects/OpenCV-2.4.3-android-sdk/sdk/native/jni/OpenCV.mk
LOCAL_MODULE := jni_part
LOCAL_SRC_FILES := jni_part.cpp
LOCAL_LDLIBS += -llog -ldl
LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog
include $(BUILD_SHARED_LIBRARY)
Which throws the errors:
Android NDK: ERROR:/Users/jamiematthews/Documents/workspace/AuthentiGuard/jni/Android.mk:on: LOCAL_SRC_FILES points to a missing file
/Users/jamiematthews/Documents/android-ndk-r8d/build/core/prebuilt-library.mk:43: *** Android NDK: Aborting . Stop.
Android NDK: Check that /Users/jamiematthews/Documents/Android-Projects/OpenCV-2.4.3-android-sdk/sdk/native/jni/../libs/mips/libon.so exists or that its path is correct
Anyone know what "LOCAL_SRC_FILES points to a missing file" could mean?
PS if I remove the lines
OPENCV_CAMERA_MODULES:=on
OPENCV_INSTALL_MODULES:=on
it compiles fine, but then I cant statically link
Found the solution. Believe it or not it was an issue with Application.mk, not Android.mk. I had set
APP_ABI := all
Previously, and not even considered that it could effect the build process of this statically. I ended up changing it to
APP_ABI := armeabi-v7a
And now, everything works fine. Note that I ended up not needing OPENCV_CAMERA_MODULES:=on, I believe that is only if you are calling the camera from JNI, which I am not
LOCAL_SRC_FILES show the file where your native code resides. If you use native OpenCV code then you have to add the name of your cpp file here.
If you do not have a native part then you should add the OpenCV library to the libs folder of your project. (in case of static initialization). Please check this page for details.
Related
I am trying to set a NDK project in Eclipse. I have build the NDK as my sample programs are working properly. But, now when I am running my code I am facing this error
*** Android NDK: Missing LOCAL_MODULE before including BUILD_SHARED_LIBRARY in jni/Android.mk . Stop.
I have tried solving it through this question
Android NDK: Missing LOCAL_MODULE before including BUILD_SHARED_LIBRARY
But, Its not working. Please help me.
Following is my Android.mk file
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
OPENCV_CAMERA_MODULES:= off
OPENCV_MK_PATH:D:\FYP\darwinwallet-master\OpenCV-2.4.9-android-sdk\sdk\native\jni\OpenCV.mk
OPENCV_LIB_TYPE:=STATIC
OPENCV_INSTALL_MODULES:=on
include $(OPENCV_MK_PATH)
LOCAL_C_INCLUDES:=D:\FYP\darwinwallet-master\OpenCV-2.4.9-android-sdk\sdk\native\jni\include\
LOCAL_MODULE:=native_wallet
LOCAL_SRC_FILES:=jni_recognizer.cpp NativeVision/vision.cpp
LOCAL_CFLAGS=-ffast-math -O3 -funroll-loopsLOCAL_LDLIBS+=-llog -ldl
include $(BUILD_SHARED_LIBRARY)
And following is my build-shared-library.mk
LOCAL_BUILD_SCRIPT := BUILD_SHARED_LIBRARY
LOCAL_MAKEFILE := $(local-makefile)
$(call check-defined-LOCAL_MODULE,$(LOCAL_BUILD_SCRIPT))
$(call check-LOCAL_MODULE,$(LOCAL_MAKEFILE))
$(call check-LOCAL_MODULE_FILENAME)
my := TARGET_
$(call handle-module-filename,lib,$(TARGET_SONAME_EXTENSION))
$(call handle-module-built)
LOCAL_MODULE_CLASS := SHARED_LIBRARY
include $(BUILD_SYSTEM)/build-module.mk
Don't use backslash in your make files, it's too dangerous. Even on Windows, you can use forward slashes, i.e. change all \ to /. This will resolve your problem immediately.
Specifically, the line where you define LOCAL_C_INCLUDES ends with \ which means for make that it does not end. make dutifully joins the next line, so what it actually sees is something like
…
LOCAL_C_INCLUDES:=D:\…\include\LOCAL_MODULE:=native_wallet
LOCAL_SRC_FILES:=jni_recognizer.cpp NativeVision/vision.cpp
…
But actually, there is no need to re-define LOCAL_C_INCLUDES after you include OpenCV.mk. This script takes care of setting the include paths, flags, and library dependencies for you.
So I've been scratching my head for quite some time with this: basically, I have two Android makefile, one in my jni folder, and one in another folder that contains my native c++ code.
Thing is, for the following makefile,
LOCAL_PATH := $(call my-dir)
GENERATED_PATH := $(LOCAL_PATH)/../../generated/release/api/Android
############################ Includes ############################
#------------------------------------------------------------------ Assimp
LOCAL_MODULE := Assimp
LOCAL_EXPORT_C_INCLUDES := $(GENERATED_PATH)/assimp/include
LOCAL_SRC_FILES := $(GENERATED_PATH)/assimp/lib/libassimp.a
include $(PREBUILT_STATIC_LIBRARY)
# More Libraries included....
#....
I get the following error:
Android NDK: ERROR:jni/../../../appCommon/Android.mk:Assimp: LOCAL_SRC_FILES points to a missing file
Android NDK: Check that jni/../../../appCommon/jni/../../../appCommon/../../generated/release/api/Android/assimp/lib/libassimp.a exists or that its path is correct
What bugs me is that there's twice the LOCAL_PATH in the path where the ndk searches for the library. I've already read about a few cases like this one (like using the notdir macro) but couldn't find a satisfying solution.
How can I specify correctly (and not manually) the correct directory ?
So it turns out that the problem stems from the PREBUILT_STATIC_LIBRARY script, which looks for the lib in the following path: $(LOCAL_PATH)/$(LOCAL_SRC_FILES)
Thus, a simple workaround that worked is to have separate variables for the directories, like that:
GENERATED_PATH := ../../generated/release/api/Android
GENERATED_INCLUDE_PATH := $(LOCAL_PATH)/$(GENERATED_PATH)
and then use them like that:
LOCAL_MODULE := Assimp
LOCAL_EXPORT_C_INCLUDES := $(GENERATED_INCLUDE_PATH)/assimp/include
LOCAL_SRC_FILES := $(GENERATED_PATH)/assimp/lib/libassimp.a
include $(PREBUILT_STATIC_LIBRARY)
I am building a complete native app in using Android NDK, when I try to build the app I am getting the following error:
D:/Softwares/android-ndk-r9c/sources/android/native_app_glue/android_native_app_glue.h:25:35: fatal error: android/configuration.h: No such file or directory compilation terminated.
I am not getting why this error is coming. I have created an Android.mk file with following content
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := mynativeactivity
LOCAL_SRC_FILES := Log.cpp Main.cpp EventLoop.cpp
LOCAL_LDLIBS := -llog -landroid
LOCAL_STATIC_LIBRARIES := android_native_app_glue
include $(BUILD_SHARED_LIBRARY)
$(call import-module,android/native_app_glue)
Also, in the project properties I have added following Paths & Symbols
D:/Softwares/android-ndk-r9c/platforms/android-9/arch-arm/usr/include
D:/Softwares/android-ndk-r9c/toolchains/arm-linux-androideabi-4.8/prebuilt/windows-x86_64/lib/gcc/arm-linux-androideabi/4.8/include
D:/Softwares/android-ndk-r9c/sources/android/native_app_glue
Can anyone suggest what am I doing wrong ?
LOCAL_LDLIBS := -landroid is the problem.
The system is expecting the configuration.h file, as simple as that.
Why do you mean by project properties ? in eclipse ? .
ndk-build would not pick your ecplise project properties.
Please add Application.mk file and mention the APP_PLATFORM := android-9 ( not sure if it should solve the problem).Otherwise , add the include path LOCAL_C_INCLUDES in your android.mk file.
I have an Android project written in C++ and have a problem in linking phase. The code is put in some static libraries which should be linked together.
I have found a lot of questions and answers on the net about this topic and most of them suggest to put my libraries to LOCAL_STATIC_LIBRARIES in the Android.mk file. But, if I do this, I found the content of LOCAL_STATIC_LIBRARIES is simply ignored: my libraries are not linked, and adding any dummy text here does not generate any error or warning message.
I tried it this way:
LOCAL_STATIC_LIBRARIES := MyLib.a
or with full path:
LOCAL_STATIC_LIBRARIES := $(LOCAL_PATH)/MyLib.a
none of them worked.
If I put my static libraries to LOCAL_LDLIBS then it is linked, but I got a warning message about non-system libraries are used, and probably the build will be wrong.
The content of my Android.mk file is:
LOCAL_LDLIBS := $(LOCAL_PATH)/MyLib.a ...
and I got this message:
Android NDK: WARNING:jni/Android.mk:myapp: non-system libraries in linker flags: jni/MyLib.a
Android NDK: This is likely to result in incorrect builds. Try using LOCAL_STATIC_LIBRARIES
Android NDK: or LOCAL_SHARED_LIBRARIES instead to list the library dependencies of the
Android NDK: current module
I could not find how to use LOCAL_STATIC_LIBRARIES right way, please help me!
I have android-ndk-r9 and android-sdk_r22.2.1 on a OpenSuSE x86 and using target=android-18
See JBL's answer here.
The LOCAL_STATIC_LIBRARIES variable does not work that way. First you need a section that defines the library you want to include:
include $(CLEAR_VARS)
LOCAL_PATH = .
LOCAL_MODULE := curl
LOCAL_EXPORT_C_INCLUDES := ../curl/include
LOCAL_SRC_FILES := ../curl/lib/libcurl.a
include $(PREBUILT_STATIC_LIBRARY)
THEN, you can include it using
include $(CLEAR_VARS)
LOCAL_MODULE = mylib
CFLAGS = ...
...
LOCAL_STATIC_LIBRARIES = curl
include $(BUILD_STATIC_LIBRARY)
Most probably the problem lies in that you are giving the extension of the library:
LOCAL_STATIC_LIBRARIES := MyLib.a
I think, it should be written as:
LOCAL_STATIC_LIBRARIES := MyLib
I'm trying to link some .so that I generated using the NDK to a new .so I'm trying to create,
as the old .so contains definitions of functions that I want to use in the new .so.
I've tried this Android.mk :
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := prog_test
LOCAL_SRC_FILES := main.c
LOCAL_MODULE_TAGS := optional
LOCAL_SHARED_LIBRARIES += mylib
include $(BUILD_SHARED_LIBRARY)
$(call import-module,<tag>) # with and without
I've also tried this method I found in stackoverflow NDK - How to use a generated .so library in another project but still no succes as I get always :
prebuilt/linux-x86/toolchain/arm-linux-androideabi-4.4.x/bin/../lib/gcc/arm-linux-androideabi/4.4.3/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lmylib.so
I really appreciate any help to solve this issue.
B.R
you have to use include $(PREBUILD_SHARED_LIBRARY) instead of include $(BUILD_SHARED_LIBRARY)