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https://issues.apache.org/jira/browse/QPID-6140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14167202#comment-14167202
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ASF subversion and git services commented on QPID-6140:
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Commit 1630945 from [email protected] in branch 'qpid/trunk'
[ https://svn.apache.org/r1630945 ]
QPID-6140: [C++ Messaging] hello_world does not define Messaging i/f completely
Add qpidtypes to hello_world and hello_xml example link library list so that
users can execute any Messaging function straight away.
> [C++ Messaging] UI Gotchya in Hello World example
> -------------------------------------------------
>
> Key: QPID-6140
> URL: https://issues.apache.org/jira/browse/QPID-6140
> Project: Qpid
> Issue Type: Improvement
> Components: Qpid Examples
> Affects Versions: 0.30
> Environment: Fedora 19, trunk build
> Reporter: Chuck Rolke
>
> Modifying hello_world.cpp to add a simple property to a message
> {noformat}
> Message message("Hello world");
> message.getProperties()["id"] = 1;
> {noformat}
> fails:
> {noformat}
> Linking CXX executable hello_world
> /usr/bin/ld: CMakeFiles/hello_world.dir/hello_world.o: undefined reference to
> symbol '_ZN4qpid5types7VariantC1ERKS1_'
> /usr/bin/ld: note: '_ZN4qpid5types7VariantC1ERKS1_' is defined in DSO
> /home/chug/git/qpid/build/src/libqpidtypes.so.1 so try adding it to the
> linker command line
> /home/chug/git/qpid/build/src/libqpidtypes.so.1: could not read symbols:
> Invalid operation
> collect2: error: ld returned 1 exit status
> make[2]: *** [examples/messaging/hello_world] Error 1
> make[1]: *** [examples/messaging/CMakeFiles/hello_world.dir/all] Error 2
> make: *** [all] Error 2
> *** Failure: Exit code 2 ***
> {noformat}
> What? What's with qpid::types::Variant? The user is adding a property as
> specified in the Messaging API spec.
> To fix this a user must find hello_world in the cmake file and add
> 'qpidtypes' as a link library, rerun cmake, and then rebuild. Strictly
> speaking qpidtypes isn't needed for the simplest hello_world case. That said,
> qpidtypes is linked to qpidmessaging and must be available for hello_world to
> run.
> Adding qpidtypes to hello_world's target_link_libraries will help new users
> experiment with Qpid Messaging more fluently.
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