HPX build fails

[elliottslaughter]

E.g.: https://github.com/StanfordLegion/task-bench/actions/runs/5661578384/job/15339764215

There are many errors, but they look like:

CMake Error at cmake/HPX_GeneratePackageUtils.cmake:400 (file):
  Error evaluating generator expression:

    $<HOST_LINK:SHELL:-Wl$<COMMA>-Bsymbolic-functions>

  $<HOST_LINK:...> may only be used with binary targets to specify link
  options.

@NanmiaoWu @diehlpk @hkaiser can we get help on resolving this? I'd like to keep the Task Bench HPX build working.

[hkaiser]

I'll have a look.

[NanmiaoWu]

I'll have a look.

Thank you Hartmut!

[hkaiser]

@elliottslaughter could you please try adding -DHPX_WITH_PKGCONFIG=Off to the cmake command line?

[elliottslaughter]

Thanks, that fixes the build. However, there is another issue, which I think predates this most recent failure. When we run HPX tests, they appear to freeze part-way through the test suite (and the test suite times out). The issue is nondeterministic, so the exact test that freezes changes each time.

Some sample failures:

• https://github.com/StanfordLegion/task-bench/actions/runs/5671609135/job/15369105790?pr=95
• https://github.com/StanfordLegion/task-bench/actions/runs/5671604610/job/15369091498?pr=95

While I'm not very familiar with HPX, my past experience with failures of this type are that some synchronization is likely missing or incorrect in the HPX implementation. E.g., I had issues like this in the Realm implementation until I managed to get all the WAR dependencies correct. Unfortunately, I don't know of any solution other than reading the code very carefully and working through it in a failing case until I'm sure I got it all right.

Does anyone have time to debug this? Again, I appreciate the effort to keep the HPX implementation in a working state.

[hkaiser]

@elliottslaughter fixing that race might take longer. I will need to find a student interested in looking into this problem.

[elliottslaughter]

Understood. There's no rush on our end, just a general interest in making sure everything is working smoothly.