This is a regression from commit b818dd9d

Basically the first AC_LINK_IFELSE sets whatever compiler we
are using to be that.  Since the above commit removed the BGL/P
code that was linked using C C++ became the compiler since the
next thing was BGQ in configure.ac to test against.

I just grabbed the DATABASES call, but any other one could had
worked.

another one.

Bug 3465

This is the way it is done with the task plugins.  It appears this only
really matters when requesting 1 task with a full socket with exclusive
access.  This code would cyclically allocate sockets to the step instead
of filling up one socket then going to the next.

Fix for job constraint specification with counts, --ntasks-per-node value,
    and no node count.
bug 3470

With the _DEBUG flag set a typecast was needed in a print statement
  for clean build

Task/cray: Treat missing "mems" cgroup with "debug" messages rather than
    "error" messages. The file may be missing at step termination due to a
    change in how cgroups are released at job/step end.

Honor --ntasks-per-node and --ntasks option when used with job constraints
    that contain node counts.
bug 3458

Defer interactive job allocation until ALL allocated nodes are ready
  rather than after PrologSlurmctld (if any) completes.

Bug 3467.

bug 1949

burst_buffer/cray - Do not execute "pre_run" operation until after all nodes
    are booted and ready for use.
bug 3461

partitions.

This reverts commit 843df527.

Insure job does not start running before node is booted and PrologSlurmctld
    is complete.
bug 3446

Ported from 7a4aa7f2.

and make it so the slurmd formats it correctly when it comes in.

Continuation of commit 7db90c8a

This is needed to make it so we can run pmix with multi-slurmd.

Bug 3446

bug 3446

burst_buffer/cray - Support default pool which is not the first pool
    reported by DataWarp and log in Slurm when pools that are added or removed
    from DataWarp.
bug 3453