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https://issues.apache.org/jira/browse/DISPATCH-2178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17367113#comment-17367113
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ASF GitHub Bot commented on DISPATCH-2178:
------------------------------------------
jiridanek commented on pull request #1267:
URL: https://github.com/apache/qpid-dispatch/pull/1267#issuecomment-864801630
MacOS seems to have failed on the empty STATIC library
https://travis-ci.com/github/apache/qpid-dispatch/jobs/516966091
```
ar: no archive members specified
usage: ar -d [-TLsv] archive file ...
ar -m [-TLsv] archive file ...
ar -m [-abiTLsv] position archive file ...
ar -p [-TLsv] archive [file ...]
ar -q [-cTLsv] archive file ...
ar -r [-cuTLsv] archive file ...
ar -r [-abciuTLsv] position archive file ...
ar -t [-TLsv] archive [file ...]
ar -x [-ouTLsv] archive [file ...]
make[2]: *** [src/libqpid-dispatch-libraries.a] Error 1
```
Other than that, it looks good (so far).
As a quick fix, I can add some dummy symbol into the library which will be
then eliminated by linker during linking anyways, so the effect will be the
same, and it should work even on macOS.
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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
> Assignee: 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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