Jiakun Yan

@hkaiser Do you have any idea why the test "jenkins/lsu/gcc-12-release" failed?

@spackbot fix style

After some investigation, I bypass this error with `--with-pmi=slurm`. However, there is no way to pass `--with-pmi=slurm` to MPICH configure through Spack so I have to manually change the MPICH...

GDB told me `post_main` was triggered earilier than the call to `hpx::distributed::barrier::synchronize()` on locality 1.

Could someone help take a look at this PR?

@alalazo I have resolved the comments. Could you take a look again?

ping @alalazo @adamjstewart