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https://issues.apache.org/jira/browse/DISPATCH-2178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17366182#comment-17366182
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ASF GitHub Bot commented on DISPATCH-2178:
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jiridanek opened a new pull request #1267:
URL: https://github.com/apache/qpid-dispatch/pull/1267
The change would've been nice and easy in CMake 3.12+. Without support for
using OBJECT library in `target_link_libraries`, it is necessary to 1) use a
STATIC library and then handle the `-Wl,--whole-archive` flag (so that symbols
used only from Python are not eliminated by linker) or 2) propagate the
dependent libraries through the build some other way. I choose option 2) here.
@astitcher Is this what you had in mind, or are there some improvements that
I've missed?
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> Do not build separate libqpid-dispatch.so
> -----------------------------------------
>
> Key: DISPATCH-2178
> URL: https://issues.apache.org/jira/browse/DISPATCH-2178
> Project: Qpid Dispatch
> Issue Type: Improvement
> Affects Versions: 1.16.0
> Reporter: Jiri Daněk
> Priority: Major
>
> h3. Motivation
> The split into a binary and a library is not unprecedented (e.g. CPython does
> exactly the same thing), but in Dispatch it is avoidable with minimal code
> changes (an executable can {{dlopen(NULL, ...)}} itself.
> Getting rid of libqpid-dispatch.so will mean one less file that we need to
> install (and since it is not a published API, finding a good place for the so
> has been tricky in the past (see DISPATCH-194).
> Furthermore, avoiding the indirection of a library call will likely give some
> performance benefit at a low level (individual function calls) similar to
> (again) Python in https://fedoraproject.org/wiki/Changes/PythonStaticSpeedup.
> The gains can be best utilized after doing LTO (see DISPATCH-2121).
> h3. Expected issues
> The problem with this is that we lose semantic interposition
> (https://fedoraproject.org/wiki/Changes/PythonNoSemanticInterpositionSpeedup),
> meaning we won't be able to simply override symbols from libqpid-dispatch.so
> at runtime. This is an issue because Dispatch unittests depend on this. (See
> DISPATCH-1783)
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