[zeromq-dev] Revisited: Example for building against ZMQ with CMake + UDP Multicast Support

Luca Boccassi luca.boccassi at gmail.com
Wed Sep 26 18:02:55 CEST 2018


The packages from OBS have a higher version so they already have
priority:

$ dpkg --compare-versions 4.2.5+git20180922 gt 4.2.5-1  && echo true || echo false
true

So either you haven't ran apt upgrade, or you have manually pinned it down, check with:

apt-cache policy libzmq5

On Wed, 2018-09-26 at 17:42 +0200, Stephan again wrote:
> Update:
> 
> I investigated my .so files with "readelf -Ws" and "objdump -T" and
> both 
> say that there are no draft api symbols. Nevertheless, when I
> download 
> the deb package from zeromq's repo and investigate the libraries in 
> there with the same tools, it matches.
> 
> So regarding the dynamic library, there is definitely a wrong
> version 
> installed. Leading to the question, why is that: "sudo apt-cache
> showpkg 
> libzmq3-dev" says:
> 
> Package: libzmq3-dev
> Versions:
> 4.2.5-1 
> (/var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_bionic_univers
> e_binary-amd64_Packages) 
> (/var/lib/dpkg/status)
>   Description Language:
>                   File: 
> /var/lib/apt/lists/download.opensuse.org_repositories_network:_messag
> ing:_zeromq:_release-draft_xUbuntu%5f18.04_._Packages
>                    MD5: 7b2c1e47f6d305566aebc0e65e04f5ee
>   Description Language:
>                   File: 
> /var/lib/apt/lists/download.opensuse.org_repositories_network:_messag
> ing:_zeromq:_release-draft_xUbuntu%5f18.04_._Packages
>                    MD5: 7b2c1e47f6d305566aebc0e65e04f5ee
>   Description Language:
>                   File: 
> /var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_bionic_universe
> _binary-amd64_Packages
>                    MD5: 7b2c1e47f6d305566aebc0e65e04f5ee
>   Description Language:
>                   File: 
> /var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_bionic_universe
> _binary-i386_Packages
>                    MD5: 7b2c1e47f6d305566aebc0e65e04f5ee
>   Description Language: en_GB
>                   File: 
> /var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_bionic_universe
> _i18n_Translation-en%5fGB
>                    MD5: 7b2c1e47f6d305566aebc0e65e04f5ee
>   Description Language: en
>                   File: 
> /var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_bionic_universe
> _i18n_Translation-en
>                    MD5: 7b2c1e47f6d305566aebc0e65e04f5ee
> 
> So in my opinion the zeromq repo should have priority over the ubuntu
> repo.
> 
> Further investigating. Help is welcome.
> 
> - Stephan
> 
> 
> On 26.09.2018 17:21, Luca Boccassi wrote:
> > And so does the shared library:
> > 
> > $ objdump -T libzmq.so.5.1.5 | grep msg_group
> > 0000000000075a60 g    DF .text	0000000000000005  Base       
> >  zmq_msg_group
> > 
> > Make sure you have actually installed it from that repository and
> > not
> > from Ubuntu's.
> > 
> > On Wed, 2018-09-26 at 17:10 +0200, Stephan again wrote:
> > > And the static library installed from this repository seems to
> > > have
> > > the
> > > draft api included. Here is the test for that:
> > > 
> > > nm -gC /usr/lib/x86_64-linux-gnu/libzmq.a | grep zmq_msg_group
> > > 
> > > nm: src_libzmq_la-devpoll.o: no symbols
> > > nm: src_libzmq_la-gssapi_mechanism_base.o: no symbols
> > > nm: src_libzmq_la-gssapi_client.o: no symbols
> > > nm: src_libzmq_la-gssapi_server.o: no symbols
> > > nm: src_libzmq_la-kqueue.o: no symbols
> > > nm: src_libzmq_la-poll.o: no symbols
> > > nm: src_libzmq_la-pollset.o: no symbols
> > > nm: src_libzmq_la-precompiled.o: no symbols
> > > nm: src_libzmq_la-select.o: no symbols
> > > nm: src_libzmq_la-vmci.o: no symbols
> > > nm: src_libzmq_la-vmci_address.o: no symbols
> > > nm: src_libzmq_la-vmci_connecter.o: no symbols
> > > nm: src_libzmq_la-vmci_listener.o: no symbols
> > > 0000000000000fb0 T zmq_msg_group(zmq_msg_t*) <- matched
> > > 
> > > Kind Regards
> > > 
> > >     Stephan
> > > 
> > > 
> > > On 26.09.2018 17:05, Stephan again wrote:
> > > > I Installed it from:
> > > > 
> > > > http://download.opensuse.org/repositories/network:/messaging:/z
> > > > erom
> > > > q:/release-draft/xUbuntu_18.04/
> > > > 
> > > > Hoping that it was compiled accordingly...
> > > > 
> > > > This:
> > > > 
> > > > g++ Discovery.cpp /usr/lib/x86_64-linux-gnu/libzmq.a -lpthread
> > > > -DZMQ_BUILD_DRAFT_API=1 -DENABLE_DRAFTS=On -o test
> > > > 
> > > > makes it even worth:
> > > > 
> > > > /usr/lib/x86_64-linux-gnu/libzmq.a(src_libzmq_la-
> > > > socket_base.o):
> > > > In
> > > > function `zmq::socket_base_t::connect(char const*)':
> > > > (.text+0x4b26): undefined reference to `pgm_freeaddrinfo'
> > > > /tmp/cc62suQj.o: In function `msg_send(zmq_msg_t*, void*, char
> > > > const*,
> > > > char const*)':
> > > > Discovery.cpp:(.text+0x8e): undefined reference to
> > > > `zmq_msg_set_group'
> > > > /tmp/cc62suQj.o: In function `msg_recv_cmp(zmq_msg_t*, void*,
> > > > char
> > > > const*, char const*)':
> > > > Discovery.cpp:(.text+0x148): undefined reference to
> > > > `zmq_msg_group'
> > > > /tmp/cc62suQj.o: In function `main':
> > > > Discovery.cpp:(.text+0x30e): undefined reference to `zmq_leave'
> > > > Discovery.cpp:(.text+0x37f): undefined reference to `zmq_join'
> > > > Discovery.cpp:(.text+0x3c3): undefined reference to `zmq_join'
> > > > Discovery.cpp:(.text+0x407): undefined reference to `zmq_join'
> > > > Discovery.cpp:(.text+0x57c): undefined reference to `zmq_join'
> > > > Discovery.cpp:(.text+0x668): undefined reference to `zmq_leave'
> > > > /usr/lib/x86_64-linux-gnu/libzmq.a(src_libzmq_la-zmq_utils.o):
> > > > In
> > > > function `zmq_curve_keypair':
> > > > (.text+0x3e6): undefined reference to `crypto_box_keypair'
> > > > /usr/lib/x86_64-linux-gnu/libzmq.a(src_libzmq_la-zmq_utils.o):
> > > > In
> > > > function `zmq_curve_public':
> > > > (.text+0x482): undefined reference to `crypto_scalarmult_base'
> > > > /usr/lib/x86_64-linux-gnu/libzmq.a(src_libzmq_la-ip.o): In
> > > > function
> > > > `zmq::initialize_network()':
> > > > (.text+0x480): undefined reference to `pgm_init'
> > > > (.text+0x511): undefined reference to `pgm_error_free'
> > > > /usr/lib/x86_64-linux-gnu/libzmq.a(src_libzmq_la-ip.o): In
> > > > function
> > > > `zmq::shutdown_network()':
> > > > (.text+0x585): undefined reference to `pgm_shutdown'
> > > > /usr/lib/x86_64-linux-gnu/libzmq.a(src_libzmq_la-random.o): In
> > > > function `zmq::random_open()':
> > > > (.text+0x95): undefined reference to `sodium_init'
> > > > /usr/lib/x86_64-linux-gnu/libzmq.a(src_libzmq_la-random.o): In
> > > > function `zmq::random_close()':
> > > > (.text+0xc1): undefined reference to `randombytes_close'
> > > > /usr/lib/x86_64-linux-gnu/libzmq.a(src_libzmq_la-pgm_socket.o): 
> > > > In
> > > > function `zmq::pgm_socket_t::init_address(char const*,
> > > > pgm_addrinfo_t**, unsigned short*)':
> > > > (.text+0x17e): undefined reference to `pgm_getaddrinfo'
> > > > (.text+0x26f): undefined reference to `pgm_error_free'
> > > > 
> > > > ....
> > > > 
> > > > Kind Regards
> > > > 
> > > >    Stephan
> > > > 
> > > > 
> > > > 
> > > > On 26.09.2018 16:55, Jake wrote:
> > > > > ZeroMQ itself needs to be compiled with ENABLE_DRAFTS in
> > > > > CMake.
> > > > > You've added it to the compiler flags when building your own
> > > > > application.  Did you compile ZeroMQ yourself or are you
> > > > > using a
> > > > > distro-provided version?
> > > > > 
> > > > > For the static library, one way is to give the full path to
> > > > > the
> > > > > .a
> > > > > file instead of using -lzmq.  gcc default behavior prefers
> > > > > the
> > > > > shared
> > > > > object when both are present.
> > > > > 
> > > > > -Jake
> > > > > 
> > > > > 
> > > > > On Wed, Sep 26, 2018 at 10:51 AM Stephan again
> > > > > <opfer at vs.uni-kassel.de <mailto:opfer at vs.uni-kassel.de>>
> > > > > wrote:
> > > > > 
> > > > >      Hi Bill,
> > > > > 
> > > > >      adding -DENABLE_DRAFTS=On does not help:
> > > > > 
> > > > >      g++ Discovery.cpp -lzmq -DZMQ_BUILD_DRAFT_API=1
> > > > >      -DENABLE_DRAFTS=On -o test
> > > > > 
> > > > >      I also checked my installed libraries with "nm -gC
> > > > > <library |
> > > > >      grep zmq_msgs_group":
> > > > > 
> > > > >      /usr/lib/x86_64-linux-gnu/libzmq.a -> match
> > > > >      /usr/lib/x86_64-linux-gnu/libzmq.so -> no match
> > > > >      /usr/lib/x86_64-linux-gnu/libzmq.so.5 -> no match
> > > > >      /usr/lib/x86_64-linux-gnu/libzmq.so.5.1.5 -> no match
> > > > > 
> > > > >      I am not so into this dynamic and static library stuff,
> > > > > but
> > > > > my
> > > > >      build chain is linking agains
> > > > >      "/usr/lib/x86_64-linux-gnu/libzmq.so". Is that the
> > > > > problem?
> > > > > How
> > > > >      do I force it on command line to link against the static
> > > > > version.
> > > > > 
> > > > >      Kind Regards
> > > > > 
> > > > >        Stephan
> > > > > 
> > > > > 
> > > > >      On 26.09.2018 16:08, Bill Torpey wrote:
> > > > > >      Hi Stephan:
> > > > > > 
> > > > > >      The RADIO/DISH sockets are considered DRAFT, which is
> > > > > > probably
> > > > > >      why you’re getting these errors.
> > > > > > 
> > > > > >      There are a couple of possibilities:
> > > > > > 
> > > > > >      - You may be linking against a version of libzmq that
> > > > > > doesn’t
> > > > > >      include the draft APIs.  In order to build with draft
> > > > > > support,
> > > > > >      the build needs to specify "-DENABLE_DRAFTS=On” on the
> > > > > > cmake
> > > > > >      command line.  Make sure your libzmq was built with
> > > > > > support
> > > > > > for
> > > > > >      the draft APIs.
> > > > > > 
> > > > > > 
> > > > > >      - You also need to enable draft APIs in your code,
> > > > > > similar
> > > > > > to
> > > > > >      following:
> > > > > > 
> > > > > >      #define ZMQ_BUILD_DRAFT_API
> > > > > >      #include <zmq.h>
> > > > > > 
> > > > > >      The #define makes the draft APIs visible to your code.
> > > > > > 
> > > > > >      (Never mind — you’re already doing this on the compile
> > > > > > command).
> > > > > > 
> > > > > >      Hope this helps.
> > > > > > 
> > > > > >      Bill
> > > > > > 
> > > > > > >      On Sep 26, 2018, at 9:13 AM, Stephan again
> > > > > > >      <opfer at vs.uni-kassel.de <mailto:opfer at vs.uni-kassel.
> > > > > > > de>>
> > > > > > > wrote:
> > > > > > > 
> > > > > > >      Hi,
> > > > > > > 
> > > > > > >      I asked this question/issue one and a half year ago
> > > > > > >      (https://lists.zeromq.org/mailman/private/zeromq-dev
> > > > > > > /2017
> > > > > > > -January/031309.html).
> > > > > > >      The difference is that I now would like to use
> > > > > > > zeromq
> > > > > > > (draft
> > > > > > >      api) version 4.2.5 under Ubuntu 18.04.
> > > > > > > 
> > > > > > >      My minimal (not) working example can be found here:
> > > > > > >      https://gist.github.com/StephanOpfer/5b9f3f76e661053
> > > > > > > 6078c
> > > > > > > b9c16072aac9
> > > > > > > 
> > > > > > >      Compiling it with this command:
> > > > > > > 
> > > > > > >          g++ Discovery.cpp -lzmq -DZMQ_BUILD_DRAFT_API=1
> > > > > > > -o
> > > > > > > test
> > > > > > > 
> > > > > > >      produces this:
> > > > > > > 
> > > > > > >          /tmp/ccUwelWs.o: In function
> > > > > > > `msg_send(zmq_msg_t*,
> > > > > > > void*,
> > > > > > >      char const*, char const*)':
> > > > > > >          Discovery.cpp:(.text+0x8e): undefined reference
> > > > > > > to
> > > > > > >      `zmq_msg_set_group'
> > > > > > >          /tmp/ccUwelWs.o: In function
> > > > > > > `msg_recv_cmp(zmq_msg_t*,
> > > > > > >      void*, char const*, char const*)':
> > > > > > >          Discovery.cpp:(.text+0x148): undefined reference
> > > > > > > to
> > > > > > >      `zmq_msg_group'
> > > > > > >          /tmp/ccUwelWs.o: In function `main':
> > > > > > >          Discovery.cpp:(.text+0x30e): undefined reference
> > > > > > > to
> > > > > > > `zmq_leave'
> > > > > > >          Discovery.cpp:(.text+0x37f): undefined reference
> > > > > > > to
> > > > > > > `zmq_join'
> > > > > > >          Discovery.cpp:(.text+0x3c3): undefined reference
> > > > > > > to
> > > > > > > `zmq_join'
> > > > > > >          Discovery.cpp:(.text+0x407): undefined reference
> > > > > > > to
> > > > > > > `zmq_join'
> > > > > > >          Discovery.cpp:(.text+0x57c): undefined reference
> > > > > > > to
> > > > > > > `zmq_join'
> > > > > > >          Discovery.cpp:(.text+0x668): undefined reference
> > > > > > > to
> > > > > > > `zmq_leave'
> > > > > > >          collect2: error: ld returned 1 exit status
> > > > > > > 
> > > > > > >      Any help is welcome. :)
> > > > > > > 
> > > > > > >      Kind Regards
> > > > > > > 
> > > > > > >        Stephan
> > > > > > > 
> > > > > > > 
> > > > > > >      _______________________________________________
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> > > > > > > .zero
> > > > > > > mq.org>
> > > > > > >      https://lists.zeromq.org/mailman/listinfo/zeromq-dev
> > > > > > 
> > > > > > 
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> > > > > > eromq
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> > > > > 
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> > > > > rg>
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> > > > > 
> > > > > 
> > > > > 
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-- 
Kind regards,
Luca Boccassi
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