hdf5: update to use parallel version of hdf5

[abhinavsns]

hdf5 parallel is required for certain applications and should not conflict with serial applications as they are part of the same source code. Having both creates linking conflicts.
Please revert PR #167477 and remove the formula hdf5-mpi as it becomes a duplicate of this.

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[SMillerDev]

There are some pretty big changes here that the description does not explain the reasons for. Please only change the serial vs parallel part in this review

[abhinavsns]

Okay! I am starting to see the issues here. Hdf5 cannot be compiled with both libcpp-hdf5 (cpp bindings) and parallel option. Probably that is why hdf5-mpi exists. Maybe it is best to introduce petsc-mpi and petsc-complex-mpi for hdf5-mpi version? I am new to brew and unsure how to resolve this issue. Some help would be appreciated. @chenrui333 @fxcoudert

[iMichka]

petsc has 262 downloads in the last 30 days; that's not much. And I am not sure how much success the two new ones would have.

Maybe this could be hosted in a tap: https://docs.brew.sh/Taps, https://docs.brew.sh/How-to-Create-and-Maintain-a-Tap

[cho-m]

Going to close this PR as current change is not the right approach. It doesn't package the standard hdf5 and just creates a duplicate of hdf5-mpi.

hdf5 and hdf5-mpi should remain separate formulae, similar to how they are distributed by major Linux repositories (e.g. Debian, Fedora, Arch Linux, etc).

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One thing you can explore is whether hdf5-mpi can be made keg-only.

Another alternative is to wait for new conflict handling (Homebrew/brew#16398), which would automatically unlink one of the formulae rather than hard blocking on conflicts. Behavior would be similar to manual approach to conflicts (i.e. brew unlink <conflicting-formula> should allow you to install the other formula)