Is hwloc supposed to support c89 only (no c99)? I remember having this
discussion earlier and the hwloc developers said that hwloc assumes c99.
At that point we ensured that there was a configure check for c99
support and hwloc was disabled if c99 support was not found (by failing
in HWLOC_SETUP_CORE). I don't see such a check in the current code.
Was this accidentally dropped at some point?
When we build mpich with c89 support, it is entering hwloc and failing
to build. Before I go tracking this, I want to make sure I'm not
missing something more straightforward.