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https://issues.apache.org/jira/browse/MESOS-1754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14120355#comment-14120355
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Timothy St. Clair commented on MESOS-1754:
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For static libraries 'ar' is called to smush the .o files into a .a. Typically
there is no link step / symbol resolution for .a files (only .so and
executables) so there is no merging of .a files by default.
A versioned .so forces linkage, hence it will force symbol resolution.
> Mesos static library has undefined symbols from 3rd party deps
> --------------------------------------------------------------
>
> Key: MESOS-1754
> URL: https://issues.apache.org/jira/browse/MESOS-1754
> Project: Mesos
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: Vinod Kone
> Assignee: Vinod Kone
>
> Looks like the static libmesos library that we build is missing some symbols
> from 3rd party deps (e.g, GLOG, ZooKeeper). I suspect this has to do with the
> order of libraries defined on the linker command line.
> {code}
> zookeeper_init symbol is present in .so but not in .a.
> $ nm libmesos.so | grep zookeeper_init
> 00000000030519f0 T zookeeper_init
> $ nm libmesos.a | grep zookeeper_init
> nm: libleveldb.a: File format not recognized
> U zookeeper_init
> Same with google::InstallFailureSignalHandler.
> $ nm libmesos.so | grep InstallFailureSignalHandler
> 000000000301901d T _ZN6google27InstallFailureSignalHandlerEv
> $ nm libmesos.a | grep InstallFailureSignalHandler
> nm: libleveldb.a: File format not recognized
> U _ZN6google27InstallFailureSignalHandlerEv
> {code}
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