[zeromq-dev] Issue linking ZMQ static library into shared library for Android

Matthias Brzezinski Matthias.Brzezinski at gmx.de
Sat Mar 7 19:01:54 CET 2015

Hey Joe,
after I refused for many hours because I thought I need to find another 
way I actually tried running your script and what should I say... It 
actually compiles!
Yet there are some other problems with my own scripts and the NDK 
therefore I cant make a real test with all my files and some test 
communication but my files dont throw any incompatible error anymore.
Could you probably explain why you used the sodium library and if i need 
to consider this library in any form while linking? Yet I just replaced 
my own static library with the one i compiled with your script and I 
replaced the include directory (Actually the whole directory is there 
but I'm not mentioning it in my makefiles). It seem to work.

I thank you very much for your script and I hope someone in the future 
will be able to solve his problems with our conversation.

With regards,

Am 06.03.2015 um 19:40 schrieb Joe McIlvain:
> Matthias,
> Unfortunately, I don't remember the details of the problems I was 
> having with the Android.mk - based build, but I ended up deciding it 
> was a better idea (and more compatible with the way Qt apps build) to 
> use a bash script that simply invokes an autotools-based build with 
> the right flags rather than trying to duplicate all the relevant 
> information from the autoconf/automake scripts into the Android.mk script.
> Again, you should be able to run the builds/qt-android scripts without 
> needing any Qt-related tools - it's just an android build system 
> designed to be *compatible* with a Qt app, rather than a build system 
> that is actually coupled to the Qt build systems.  So I'd be curious 
> what the result would be if you tried to use that build system instead.
> On Fri, Mar 6, 2015 at 10:25 AM, Matthias Brzezinski 
> <Matthias.Brzezinski at gmx.de <mailto:Matthias.Brzezinski at gmx.de>> wrote:
>     Hey Joe,
>     thank you for your answer.
>     I've looked through your script and it helped me verifying that I
>     did not miss a flag, a step or something i was not considering yet.
>     Generally it doesn't matter if I compile a static or a shared
>     library - The NDK uses its own linker to link the prebuilt libraries.
>     Am 06.03.2015 um 18:17 schrieb Joe McIlvain:
>>     Matthias,
>>     I don't usually compile them as static, but you may be able to
>>     get some ideas/help from using or looking at the scripts I added
>>     under `builds/qt-android`of the zeromq repository.  I use these
>>     to compile for use with Qt on android, but there's nothing really
>>     Qt-specific about them.  I only added them because the android
>>     scripts didn't work for me.  They didn't seem to be
>     The syntax for the android makefiles are a bit different, but I
>     used the same flags as far I can see. Hence, I never worked with
>     qt before.
>     What exactly didn't work with the android scripts? Did you have
>     problems getting the NDK to work generally, or just the NDK in
>     combination with ZeroMQ? I hope for the first, because it would be
>     a mess if I wouldn't find a way to use ZeroMQ with native code and
>     the NDK where for example the protobuf library compiled on the
>     first try.
>     With regards,
>     Matthias
>>     maintained, but I didn't want to clobber something that someone
>>     out there might be relying on.
>>     I don't know a lot about the android toolchain because working
>>     with Qt hides a lot of the platform-specific stuff from me, but I
>>     learned just enough about the toolchain to make those scripts
>>     work and get them into the CI for the repository.
>>     On Fri, Mar 6, 2015 at 6:30 AM, Matthias Brzezinski
>>     <Matthias.Brzezinski at gmx.de <mailto:Matthias.Brzezinski at gmx.de>>
>>     wrote:
>>         Hey,
>>         I'm having issues linking ZeroMQ into my shared library for
>>         Android.
>>         I followed the steps on http://zeromq.org/build:android to
>>         build the static library. I tried it with the recommended
>>         NDKr8 but also tried it with the NDK10d. I've build the
>>         static library for arm with the official ndk-toolchain.
>>         Afterwards I try to link thoose libraries into my shared
>>         library to compile a bunch of cpp files.
>>         I've successfully compiled and linked different static
>>         libraries into my projects so I'm pretty confused why the
>>         linker throws the Error when I work with ZeroMQ. I've omitted
>>         the other working libraries.
>>         My Android.mk:
>>         http://pastebin.com/N7gueqre
>>         My Application.mk:
>>         http://pastebin.com/nNgCYM2F
>>         In both code blocks I've ommited everything that is not
>>         necessary for solving this issue. The error message stays the
>>         same. I've tried to build the shared library under windows
>>         and later under debian and ubuntu. The error message is:
>>         /tmp/android-ndk-r10d/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld:
>>         error: ./zmq/lib /libzmq.a(libzmq_la-zmq.o): incompatible target
>>             collect2: error: ld returned 1 exit status
>>             make: *** [obj/local/armeabi/libzmqTest.so] Error 1
>>         (I guess 3 lines are not worth a pastebin)
>>         I'm working on Windows 8.1 with Android Studio 1.1. I've
>>         compiled the libraries under Linux Mint 16, a up-to-date
>>         ubuntu system and an old debian server.
>>         I build zeromq3-x and zeromq4-x.
>>         Any idea is welcome and appreciated.
>>         If this is not the right place to ask such a question, please
>>         tell me where to ask it instead.
>>         With regards,
>>         Matthias
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