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

[Matthias Brzezinski]

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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