[zeromq-dev] Revisited: Example for building against ZMQ with CMake + UDP Multicast Support
Luca Boccassi
luca.boccassi at gmail.com
Wed Sep 26 23:08:04 CEST 2018
That said, I'll have a look and see if I can add a +draft to the
version number of draft builds in OBS so that they work out as higher.
Given they are in a separate repo it's reasonable to assume they are
intended to have priority.
On Wed, 26 Sep 2018 at 22:06, Luca Boccassi <luca.boccassi at gmail.com> wrote:
>
> The -X is added because this is how versioning in distribution works:
>
> https://www.debian.org/doc/debian-policy/ch-controlfields.html#version
>
> The reason for a separate build for draft APIs is that they can change
> at any moment without any warning in an incompatible way and break
> existing programs, so they are not suitable for distros and production
> use.
>
> On Wed, 26 Sep 2018 at 21:48, Stephan Opfer <opfer at vs.uni-kassel.de> wrote:
> >
> > Ah thx, for that option. I was just wondering, why the hell ubuntu is adding -1 to their version. Its probably the same version as your stable versionin your repo, right?
> >
> > The actual best solution in my opinion would be to have a libzmq3draft-dev and libzmq5draft in ubuntu as well...
> >
> > So I did switch to the rolling one and it finally works. :D
> >
> >
> > On 26.09.2018 18:47, Luca Boccassi wrote:
> >
> > Right, I thought you were using the rolling one, my bad.
> >
> > In that case you can add the following to /etc/apt/preferences.d/zmq
> >
> > Package: *
> > Pin: origin download.opensuse.org
> > Pin-Priority: 1000
> >
> > Priority of 1000 means that it will install packages from that origin
> > even if they are technically downgrades.
> >
> > On Wed, 2018-09-26 at 18:08 +0200, Stephan again wrote:
> >
> > Well... thats not the case for "release-draft". There it is 4.2.5
> > and
> > ubuntu provides 4.2.5-1.
> >
> > Doh!
> >
> >
> > On 26.09.2018 18:02, Luca Boccassi wrote:
> >
> > 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_uni
> > vers
> > e_binary-amd64_Packages)
> > (/var/lib/dpkg/status)
> > Description Language:
> > File:
> > /var/lib/apt/lists/download.opensuse.org_repositories_network:_me
> > ssag
> > ing:_zeromq:_release-draft_xUbuntu%5f18.04_._Packages
> > MD5: 7b2c1e47f6d305566aebc0e65e04f5ee
> > Description Language:
> > File:
> > /var/lib/apt/lists/download.opensuse.org_repositories_network:_me
> > ssag
> > ing:_zeromq:_release-draft_xUbuntu%5f18.04_._Packages
> > MD5: 7b2c1e47f6d305566aebc0e65e04f5ee
> > Description Language:
> > File:
> > /var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_bionic_univ
> > erse
> > _binary-amd64_Packages
> > MD5: 7b2c1e47f6d305566aebc0e65e04f5ee
> > Description Language:
> > File:
> > /var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_bionic_univ
> > erse
> > _binary-i386_Packages
> > MD5: 7b2c1e47f6d305566aebc0e65e04f5ee
> > Description Language: en_GB
> > File:
> > /var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_bionic_univ
> > erse
> > _i18n_Translation-en%5fGB
> > MD5: 7b2c1e47f6d305566aebc0e65e04f5ee
> > Description Language: en
> > File:
> > /var/lib/apt/lists/de.archive.ubuntu.com_ubuntu_dists_bionic_univ
> > erse
> > _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:/messagin
> > g:/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-ka
> > ssel.
> > de>>
> > wrote:
> >
> > Hi,
> >
> > I asked this question/issue one and a half year
> > ago
> > (https://lists.zeromq.org/mailman/private/zerom
> > q-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/5b9f3f76e6
> > 61053
> > 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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> >
> > --
> > Distributed Systems Research Group
> > Stephan Opfer T. +49 561 804-6283 F. +49 561 804-6277
> > Univ. Kassel, FB 16, Wilhelmshöher Allee 73, D-34121 Kassel
> > WWW: http://www.uni-kassel.de/go/vs_stephan-opfer/
> >
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