i'm wrapping a native API to Android by NDK.
But when building it don't find the header files.
I have the following structure.
project/jni
Android.mk
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 DelegateDRMProcessorClient.cpp
LOCAL_STATIC_LIBRARY := adept cryptopenssl dp expat fonts hobbes jpeg mschema png t3 xml zlib
include $(BUILD_SHARED_LIBRARY)
project/jni/prereqs/
Android.mk (Used to call all subdirs Android.mk files)
LOCAL_PATH := $(call my-dir)
include $(call all-subdir-makefiles)
include $(CLEAR_VARS)
project/jni/prereqs/%lib%/
Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE :=dp
LOCAL_SRC_FILES :=libdp.a
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_STATIC_LIBRARY)
And there's a include folder on each %lib% folder.
When using ndk-build I get a
"/home/marcos/dev/workspace/rmsdk.native.wraper/jni/DelegateDRMProcessorClient.h:18:20: error: dp_all.h: No such file or directory"
Anyone knows how to include these header to be available to the compiler?
I solve it, getting all the headers in a folder and including the following line in the Android.mk
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include-all
This works, but not looks like the best approach.
I'm a bit late to this party, but ran into the same issue and might have an answer for your comment:
"This works, but not looks like the best approach"
There;s a sample in the NDK called "module-exports"
It shows how to construct an Android.mk file which respects header files living in their proper directories and not all dumped into a single include directory.
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := foo
LOCAL_SRC_FILES := foo/foo.c
LOCAL_CFLAGS := -DFOO=2
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/foo
LOCAL_EXPORT_CFLAGS := -DFOO=1
LOCAL_EXPORT_LDLIBS := -llog
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := bar
LOCAL_SRC_FILES := bar/bar.c
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/bar
LOCAL_STATIC_LIBRARIES := foo
include $(BUILD_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := zoo
LOCAL_SRC_FILES := zoo/zoo.c
LOCAL_SHARED_LIBRARIES := bar
include $(BUILD_SHARED_LIBRARY)
Years later...
To export the include directory instead of individual files, I use the following:
LOCAL_EXPORT_C_INCLUDE_DIRS := $(MY_DIRECTORY_PATH)
For example, for the above question the export for "foo" would look like:
LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/foo
For new people's convenience, I just want to add that move all your header files in folder which is referred by LOCAL_C_INCLUDES := $(LOCAL_PATH) and then save android.mk and restart eclipse. After trying all the above solutions, that worked for me.
Related
I'm using ndk-build to build a set of shared library(.so) for my android project. I configured and made the source code of C++ library(gdal-2.2.2).
everything was ok.("./configure & make & make install" was successful).
So i created my jni folder like this documentation.
but when I'm trying to use ndk-build on windows, I get a lot of error like "Undefined refrence to somthing".
I've spent a lot of time on this project. Is there someone to help me?
Thanks.
Update
I used configure like this on ubuntu 16.04:
./configure --prefix=/home/mahdi/Desktop/build/ --with-spatialite=yes --with-spatialite-soname=libspatialite.so --host=i686-linux-android CXXFLAGS="-D_GLIBCXX_USE_CXX11_ABI=0" LIBS="-lsupc++ -lstdc++"
After make & make install step I created JNI. this is my directory.
jniwrap
jni
gdal
Android.mk
Application.mk
gdal_wrap.cpp
gdalconst_wrap.c
gnm_wrap.cpp
libgdal.a
ogr_wrap.cpp
osr_wrap.cpp
Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := gdal
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/gdal/include
LOCAL_SRC_FILES := libgdal.a
LOCAL_EXPORT_LDLIBS := -lz
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := gdaljni
LOCAL_SRC_FILES := gdal_wrap.cpp
LOCAL_STATIC_LIBRARIES := gdal
include $(BUILD_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := gdalconstjni
LOCAL_SRC_FILES := gdalconst_wrap.c
LOCAL_STATIC_LIBRARIES := gdal
include $(BUILD_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := ogrjni
LOCAL_SRC_FILES := ogr_wrap.cpp
LOCAL_STATIC_LIBRARIES := gdal
include $(BUILD_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := osrjni
LOCAL_SRC_FILES := osr_wrap.cpp
LOCAL_STATIC_LIBRARIES := gdal
include $(BUILD_SHARED_LIBRARY)
Aplication.mk
APP_STL := gnustl_shared
APP_CFLAGS := Android.mk
APP_ABI := x86
APP_PLATFORM := android-14
Then I used android-ndk-r16b in windows-x86_64 but I faced with these errors like this picture:
There was a lot of "undefined reference error" that i can't show here.
Note: for making gdal Java Binding I used swig and jdk7 on my ubuntu 16.04.
When you build libgdal.a on your ubuntu machine, you must have sqlite3, which resolves #include "sqlite3.h".
These include files are enough for a static library, but to create libgdaljni.so you also need libsqlite3.a. You can cross-compile it for Android it yourself on the same ubuntu machine, but it is probably OK to get prebuilt library e.g. from https://github.com/couchbase/couchbase-lite-java-native/tree/master/vendor/sqlite/libs/android.
Copy this file (for appropriate ABI) to the same directory, and modify your Android.mk accordingly:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := sqlite3
LOCAL_SRC_FILES := libsqlite3.a
include $(PREBUILT_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := gdal
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/gdal/include
LOCAL_SRC_FILES := libgdal.a
LOCAL_EXPORT_LDLIBS := -lz
LOCAL_STATIC_LIBRARIES := sqlite3
include $(PREBUILT_STATIC_LIBRARY)
*continued without changes*
If you still have "undefined reference error", this could mean that some other libraries should be added.
I have libcurl.a compiled for armeabi, armeabi-v7a and x86. I want to include it in my android project and successfully execute this simple code, The problem is I'm not quite sure what to write in android.mk and application.mk to make it happen!
I have written this so far: Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := com_Hazem_test_Hazem.c
LOCAL_MODULE:= com_Hazem_test_Hazem
include $(BUILD_SHARED_LIBRARY)
Application.mk
APP_ABI := armeabi armeabi-v7a x86
kindly, help me figure out the contents of those two files.
You have to include these lines after LOCAL_PATH := $(call my-dir) and before the part that uses the libcurl
include $(CLEAR_VARS)
LOCAL_MODULE := curl_static
LOCAL_SRC_FILES := <path>/libcurl.a
LOCAL_EXPORT_C_INCLUDES := <path>/curl/include
include $(PREBUILT_STATIC_LIBRARY)
and to use:
LOCAL_STATIC_LIBRARIES += curl_static
I have an Android.mk file that has a number of files for which LOCAL_CFLAGS get applied to them. I would like to apply a different flag to only one of the files out of the many. How can this be accomplished?
I searched the internet from the Android perspective, but didn't find a whole lot. Considering the following example I would like to apply flag TEST3 to file test3.c only. I looked at Per-file CPPFLAGS in Android.mk, but I couldn't find anything as far as how to use PRIVATE_CPPFLAGS to one file. Any ideas?
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := test
LOCAL_SRC_FILES := test1.c test2.c test3.c
LOCAL_CFLAGS := -DTEST1_2_AND_3
include $(BUILD_SHARED_LIBRARY)
The supported way to achieve your goal is to use a separate static library for C/CPP files that need different parameters. In this particular case, the fix would be as easy as
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := test3
LOCAL_SRC_FILES := test3.c
LOCAL_CFLAGS := -DTEST1_2_AND_3 -DTEST3
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := test
LOCAL_SRC_FILES := test1.c test2.c
LOCAL_CFLAGS := -DTEST1_2_AND_3
LOCAL_WHOLE_STATIC_LIBRARIES := test3
include $(BUILD_SHARED_LIBRARY)
There is another approach, similar to one I forged a while ago
LOCAL_PATH := $(call my-dir)
TARGET-process-src-files-tags += $(call add-src-files-target-cflags, $(LOCAL_TEST3_SRC_FILES), $(LOCAL_TEST3_CFLAGS))
include $(CLEAR_VARS)
LOCAL_MODULE := test
LOCAL_SRC_FILES := test1.c test2.c test3.c
LOCAL_CFLAGS := -DTEST1_2_AND_3
LOCAL_TEST3_SRC_FILES := test3.c
LOCAL_TEST3_CFLAGS := -DTEST3
include $(BUILD_SHARED_LIBRARY)
If -Dtest3 would do, you can use another hack:
LOCAL_PATH := $(call my-dir)
get-src-file-target-cflags = $(LOCAL_SRC_FILES_TARGET_CFLAGS.$1) -D$(basename $1)_DEFINE
include $(CLEAR_VARS)
LOCAL_MODULE := test
LOCAL_SRC_FILES := test1.c test2.c test3.c
LOCAL_CFLAGS := -DTEST1_2_AND_3
include $(BUILD_SHARED_LIBRARY)
See more in How to dynamically get the current compiler target file name in Android.mk's LOCAL_CFLAGS?.
I'm trying to call C++ method in Java coding.
I received the Android NDK : Aborting. Stop when defined the Android.mk file as below :
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := libs/ffmpeg.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := ffmpeg.cpp
LOCAL_SHARED_LIBRARIES := ffmpeg
include $(BUILD_SHARED_LIBRARY)
But if I defined like this, it run successfully :
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := libs/ffmpeg.so
include $(BUILD_SHARED_LIBRARY)
Questions :
1 - How to fix this error?
2 - In Android.mk file, Can not call libs/ffmpeg.so and ffmpeg.cpp in the same time?
People who know this,
Please tell me,
Thanks,
p/s : Project structure :
When seeing the Android.mk structure.
I think I need change Android.mk file like this :
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := libs/ffmpeg.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := final_ffmpeg
LOCAL_SRC_FILES := ffmpeg.cpp
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog
LOCAL_PREBUILTS := libs/ffmpeg.so
#libavformat libavcodec libswscale libavutil
include $(BUILD_SHARED_LIBRARY)
The result will help me :
It still be exactly when you need call the C++ function in C++ file from Java file.
I want to build an shared library. To build it, I need to call another shared library. Here is what I did:
1.Create one Android project,named "BuildLib",and add a new folder "jni" under the project directory. Contents of jni folder:
jni-->Android.mk
-->Application.mk
-->add.cpp
-->add.h add.cpp just do two numbers addition:
add.h:
int add(int a,int b);
add.cpp:
#include "add.h"
int add(int a,int b){
return a+b;}
Android.mk:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := add.cpp
LOCAL_MODULE := add
include $(BUILD_SHARED_LIBRARY)
After build the project,I got libadd.so under directory $(BUILDLIB)/libs/armeabi/.
Create another Android project, named "CallLib". Copy libadd.so and add.h to jni folder, create Android.mk, Application.mk, and call_add.cpp.
Android.mk:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := libadd.so
LOCAL_MODULE := add_prebuilt
include $(PREBUILD_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_C_INCLUDES := $(LOCAL_PATH）
LOCAL_SRC_FILES := call_add.cpp
LOCAL_MODULE := native
LOCAL_SHARED_LIBRARIES := add_prebuilt
include $(BUILD_SHARED_LIBRARY)
call_add.cpp:
#include "add.h"
int call_add(){return add(1,2);}
After all above, I build the CallLib project, but got the error:
undefined reference to 'add(int, int)';
I think the libadd.so can not be found, but I don't know how to modify. Does anyone know how I can fix this? Any help will be appreciated.
In your second Android.mk, try replacing the first module with:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := libadd.so
LOCAL_MODULE := add_prebuilt
LOCAL_EXPORT_C_INCLUDES := add.h
include $(PREBUILD_SHARED_LIBRARY)
The LOCAL_EXPORT_C_INCLUDES flag should attach the header information to the add_prebuilt module, so it can be linked with your final library.
Just in case anyone needs it:
A bit hackish way to keep the linker happy:
LOCAL_LDLIBS := -llog
or
LOCAL_LDLIBS := -L$(LOCAL_PATH)/lib -lMyStuff
Less hackish:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := xyz
LOCAL_SRC_FILES += xyz/xyz.c
LOCAL_LDLIBS := -llog
include $(BUILD_SHARED_LIBRARY) # this builds libxyz.so
include $(CLEAR_VARS)
LOCAL_MODULE := abc
LOCAL_SHARED_LIBRARIES := xyz # <=== !!! this makes libabc.so dependent on libxyz.so
LOCAL_SRC_FILES := abc/abc.c
#LOCAL_LDLIBS := ...
include $(BUILD_SHARED_LIBRARY) # this builds libabc.so