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To make the cherry-pick clean, I cherry-picked two commits from master:

The net is to fully remove libompitrace.

Refs #10036

Ensure to check for MPI_DATATYPE_NULL before calling
PMPI_Type_get_name().  As of MPI-4.0, there's still at least some
disagreement as to whether MPI_DATATYPE_NULL is a valid input
parameter for MPI_TYPE_GET_NAME.  While that discussion is ongoing,
fix up libompitrace to do what is guaranteed to work.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>
(cherry picked from commit f650d3c)
This small library was added for a specific purpose several years ago.
There is no longer a maintainer for this library, and it hasn't been
documented for years (and therefore there are likely very few -- if
any -- users).  We're therefore removing libompitrace from future
versions of Open MPI; it can be obtained from prior version of Open
MPI if it is desired.

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>
(cherry picked from commit 0f51406)
@awlauria awlauria linked an issue Feb 28, 2022 that may be closed by this pull request
@awlauria awlauria merged commit ce56af7 into open-mpi:v5.0.x Mar 1, 2022
@jsquyres jsquyres deleted the pr/v5.0.x/remove-libompitrace branch July 17, 2022 12:21
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Do we want libompitrace in OMPI v5.0?

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