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https://issues.apache.org/jira/browse/AVRO-1358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Douglas Creager updated AVRO-1358:
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Attachment: 0001-Hide-Jansson-symbols-in-Avro-library.patch
Good catch — I actually already have a patch lying around to fix this, which I
had forgotten to merge into SVN. It uses the same GCC pragma that you suggest.
> internal version of jansson exports the jansson symbols which collide with
> json-c and jansson libraries
> -------------------------------------------------------------------------------------------------------
>
> Key: AVRO-1358
> URL: https://issues.apache.org/jira/browse/AVRO-1358
> Project: Avro
> Issue Type: Bug
> Components: c
> Affects Versions: 1.7.4
> Environment: linux
> Reporter: External Builds
> Attachments: 0001-Hide-Jansson-symbols-in-Avro-library.patch
>
>
> The 1.7.x version of AVRO includes an "internal" copy of jansson library, but
> it also exports all of the jansson symbols which will collide with other
> libraries. The symbol 'json_object_get' will collide with the json-c library
> and all of the 'json_*' symbols collide with the external jansson library.
> If you don't want to have an external dependency on 'jansson' then it seems
> that the symbols will need to have a hidden visibility or some other
> mechanism to keep them from being exported with the AVRO library.
> As a temporary solution we have wrapped the internal jansson functions with
> this so they are hidden:
> #pragma GCC visibility push(hidden)
> json_function()
> #pragma GCC visibility pop
> Many other solutions exist. I don't see that having an external dependency is
> such a drawback, as many other open source packages have dependencies on
> other open source packages, but any solution would be appreciated.
> Thanks!
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