Thank you very much for this. I've replied further below:
----- Original Message -----
> From: Joshua Hursey <jjhursey_at_[hidden]>
> What other configure options are you passing to Open MPI? Specifically the
> configure test will always fail if '--with-ft=cr' is not specified - by
> default Open MPI will only build the BLCR component if C/R FT is requested by
> the user.
This was it! Now the BLCR supports builds in just fine.
If I may offer some feedback:
When I think "Checkpoint/Restart", I don't immediately think "Fault Tolerance"; rather, I'm interested in it for a better alternative to suspend/resume. So I had *no* idea turning on the "ft" configure option this was a prerequisite for BLCR support to compile from just reading the configure help, configure output, docs, etc.
I'd like to request that this be made easier to spot. At a minimum, the configure -help output could mention this when it gets to talking about BLCR, or C/R in general.
Additionally, in general when configuring components, it would be nice in the config logs if there was a way to get more details about the tests (and why they failed) than just "can compile...no". This may require more invasive changes - not being super-knowledgeable about configure, I don't know how much work this would be.
Lastly, the standard Open MPI documentation (particularly the FAQ) could be updated in the C/R or BLCR sections to reflect the need for the "--with-ft=cr" argument.
Again, I really appreciate the assistance.