[MacPorts] #59626: openmpi @4.0.1: opportunistic linking to libevent

[MacPorts]

#59626: openmpi @4.0.1: opportunistic linking to libevent
--------------------+---------------------
 Reporter:  p-bro   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  openmpi
--------------------+---------------------
 Several subports of openmpi (I saw it for openmpi-gcc5 openmpi-gcc7
 openmpi-gcc8 openmpi-default) opportunistically link to
 /opt/local/lib/libevent-#.#.#.dylib, a library provided by the libevent
 port.

 {{{
 Could not open /opt/local/lib/libevent-2.1.6.dylib: Error opening or
 reading file (referenced from /opt/local/lib/openmpi-
 mp/libmca_common_monitoring.50.dylib)
 ...
  openmpi-gcc5 @4.0.1+fortran
  openmpi-gcc7 @4.0.1+fortran
  openmpi-gcc8 @4.0.1+fortran
  openmpi-default @4.0.1+gcc8
 }}}

 libevent is not listed as one of the dependencies of openmpi (not even
 indirectly), thus an upgrade of libevent triggers a rev-upgrade rebuild of
 openmpi, and uninstallation of libevent breaks openmpi.

 Here's the section from the openmpi configure process confirming its
 recognition of libevent and then linking to it:
 {{{
 --- MCA component event:external (m4 configuration macro, priority 90)
 checking for MCA component event:external compile mode... static
 checking --with-libevent-libdir value... simple ok (unspecified value)
 checking for external libevent in... (default search paths)
 checking event2/event.h usability... yes
 checking event2/event.h presence... yes
 checking for event2/event.h... yes
 looking for library without search path
 checking for library containing event_config_new... -levent
 checking for evthread_set_lock_callbacks in -levent... yes
 checking for evthread_use_pthreads in -levent_pthreads... yes
 checking if external libevent version is 2.0.22 or greater... yes
 checking if MCA component event:external can compile... yes
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/59626>
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