[zeromq-dev] linking to a static 0MQ 2.2.0 library in VS10

[Ivan Pechorin]

2012/4/29 Jonathan Livni <jonathan.livni at gmail.com>

> I'm trying to build a 0MQ C++ example<http://zguide.zeromq.org/cpp%3awuserver> using
> VS10 and ZeroMQ 2.2.0.
>
> I downloaded the windows sources<http://download.zeromq.org/zeromq-2.2.0.zip> and
> tried to follow these instructions<http://lists.zeromq.org/pipermail/zeromq-dev/2011-September/013150.html> in
> order to build 0MQ statically. Specifically:
>
>    - Switched to Release
>    - For all 7 projects in the solution:
>       - set General\Configuration Type to Static library (.lib)
>       - set C/C++\Code Generation\Runtime Library to Multi-threaded (/MT)
>       - added ZMQ_STATIC to C/C++\Preprocessor\Preprocessor Definitions
>    - Updated zmq.h and zmq_utils.h so that if _MSC_VER and ZMQ_STATIC are
>    defined thenDLL_EXPORT will also be defined
>
> At this point 0MQ seems to build well.
>
>    - Created an empty console project:
>       - switched to Release
>       - added a single cpp file with the example linked above
>          - changed random to rand, srandom to srand and snprintf to
>          _snprintf
>       - set C/C++\Code Generation\Runtime Library to Multi-threaded (/MT)
>       - added ...\zeromq-2.2.0\include folder to C/C++\General\Additional
>       Include Directories
>       - added ...\zeromq-2.2.0\builds\msvc\Release\*.lib to Linker\Input\Additional
>       Dependencies
>
> However I still receive the following linking errors:
>
> 1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_bind
> 1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_close
> 1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_errno
> 1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_init
> 1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_msg_data
> 1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_strerror
> 1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_socket
> 1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_msg_init_size
> 1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_term
> 1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_msg_close
> 1>zmqexp.obj : error LNK2001: unresolved external symbol __imp__zmq_send
>
> What have I missed?
>

It seems like you added (defined) ZMQ_STATIC only when building 0MQ as
static library.

You should also add/define ZMQ_STATIC when building your application,
otherwise ZMQ_EXPORT in zmq.h defaults to __declspec(dllimport) and you get
these linking errors.
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