shared so library problem

[EricS]

Hi,

I am new to android development. We have many c++ libraries that we
would like to use on Android.

I am made an interface shared libary that I am able to run in a java
app, but when I attempt to link another so library, the first so
library fails to load.

Here is my andriod.mk file for the java jni so file:

# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := XInterface
LOCAL_SRC_FILES := ../src/XInterface.cpp
LOCAL_CPPFLAGS += -D ANDROID
LOCAL_C_INCLUDES :=$(LOCAL_PATH)/../../
LOCAL_SHARED_LIBRARIES := XCalcs

include $(BUILD_SHARED_LIBRARY)

Here is my linked in so library android.mk file for the XCalcs so
library:

# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := XCalcs
LOCAL_SRC_FILES := ../src/Location.cpp
LOCAL_CPPFLAGS += -D ANDROID
LOCAL_C_INCLUDES :=$(LOCAL_PATH)/../../
include $(BUILD_SHARED_LIBRARY)

I am using ndk r3 and google version 2.1 of the sdk. What
modifications do I need to make to get these so libaries to load on
the android?

Thanks

Eric

[David Turner]

What is the error message when trying to load the dynamic library ?

The logcat output should give you information about what is wrong here.

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[EricS]

In the logcat window of Eclipse it says it can not find XCalcs module
(library). My problem is that I have checked and both libraries are
in the Emulator in the same folder/directory. Also XCalcs does not
have any dependencies.

How can I work around this issue?

Another question, is there a limit on the size of a so file?

Thanks

Eric

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[mic _]

It will be easier for people to spot the problem if you posted the
exact logcat output.

/Michael

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[EricS]

Here is what logcat says:

04-01 15:52:21.333: DEBUG/dalvikvm(237): Trying to load lib /data/data/
com.staudertech/lib/libXInterface.so 0x43d02d68
04-01 15:52:21.364: INFO/dalvikvm(237): Unable to dlopen(/data/data/
com.staudertech/lib/libXInterface.so): Cannot load library:
link_image[1721]: 29 could not load needed library 'libXCalcs.so'
for 'libXInterface.so' (load_library[1051]: Library 'libXCalcs.so' not
found)
04-01 15:52:21.373: WARN/dalvikvm(237): Exception Ljava/lang/
UnsatisfiedLinkError; thrown during Lcom/staudertech/
StauderInterface;.<clinit>

Both the so libraries are in the same location.

Thanks

Eric

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[EricS]

Is there any suggestions on how to solve this issue? Can I compile /
link it a different way to get around this issue?

If so how?

Any suggestions would be appreciated.

Thanks

Eric

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[David Turner]

On which version of the system are you running this ? The Android 1.5 dynamic linker had a bug that looks like exactly your bug. This was fixed in 1.6.

[EricS]

I am running this on the emulator on the March 2010 NDK r3. The
selected platform is 2.1 with the eclipse adt of 0.9.6.

Thanks

Eric

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[David Turner]

this is strange, what is the exact output of the following:

adb shell ls /data/data/com.staudertech/lib

?

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[EricS]

The output is:

C:\>adb shell ls /data/data/com.staudertech/lib
libXCalcs.so
libXInterface.so

Thanks

Eric

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[David Turner]

ah sorry, what about using the -l flag too to see permissions and library sizes, i.e.

adb shell ls -l /data/data/com.staudertech/lib

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[EricS]

Here is the output:

C:\>adb shell ls -l /data/data/com.staudertech/lib
-rw-r--r-- system system 72826 2010-04-01 10:46 libXCalcs.so
-rw-r--r-- system system 298112 2010-04-01 10:47
libXInterface.so

C:\>

Is there a size limit on the so files? Should I be doing this linking
another way?

Thanks

Eric

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[Addy]

Hi Erics,

Before some day I had a same problem of dlopen() cant open .so file at
the runtime.

I think,

U just put the libXCalcs.so file in your ndk root android-ndk-r3/build/
platforms/android-5<whatever you use 3-4-5>/arch-arm/usr/lib folder
and try it.

May be It works..

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[EricS]

I finally got this to work, but adding another
system.loadLibrary("XCalcs"); before the
system.loadLibrary("XInterface"); statement.

Evidently, if you have so files that depend on each other, you have to
add the loadLibary statement for each dependency.

Thanks for your assistance.

Thanks

Eric

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[Addy]

Hi Erics.

I read your questions.

And I tried with your suggestion,

I work on chm application in which I want to load dynamically linked
library libchm.so.

And In my java file I put the same code..

system.loadLibrary("chm");
system.loadLibrary("test_demo");

and then compile it at the ndk_root directory with

make APP=test_demo command,

but it gives error

Android NDK: Building for application 'test_demo'
Compile thumb : test_demo <= ~/workspace/test_demo/jni/test_demo.c
make: *** No rule to make target `out/apps/test_demo/armeabi/
libchm.so', needed by `out/apps/test_demo/armeabi/libtest_demo.so'.
Stop.

in test_demo.c I used some functions which are dependent on libchm.so
file.

can you please help me?

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[EricS]

Hi Andy,

Yes, I did not document what I did when I link the shared libraries
together. Copy the shared so to the out directory of test_demo, then
it should find it and link.

Thanks

Eric

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