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

Stephan again opfer at vs.uni-kassel.de
Wed Sep 26 17:05:56 CEST 2018


I Installed it from:

http://download.opensuse.org/repositories/network:/messaging:/zeromq:/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/5b9f3f76e6610536078cb9c16072aac9
>>>
>>>     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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>>>     zeromq-dev at lists.zeromq.org <mailto:zeromq-dev at lists.zeromq.org>
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>>
>>
>>
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