Spack Enzyme build

[white238]

Adds Enzyme as a TPL that is not fully enabled but exists in the TPL build. Set -DSERAC_USE_ENZYME=ON on the command line for config-build.py or cmake to enable.

Notable Changes:

• Updates to Spack 1.0
• Updates to TOSS4 to clang@19 and gcc@13
• Updates to new Tribol that includes tet support

Things currently out of scope of this PR but up for debate and will hopefully done shortly after:

• Updating mac build
• Updating docker containers (working on it but radiuss-docker repo is quite broken and needs to be updated)
• Updating blueos and toss4_cray
• Updating to clang-format 19

Updated docs:
https://serac.readthedocs.io/en/task-white238-spack_enzyme_compiler/sphinx/quickstart.html#building-serac-s-dependencies-via-spack-uberenv
https://serac.readthedocs.io/en/task-white238-spack_enzyme_compiler/sphinx/dev_guide/tpl_build.html

PRs this is dependent on:
llnl/uberenv#147
llnl/radiuss-spack-configs#134

Worked around Spack issue:
spack/spack#51244

[tupek2]

A bit outside my expertise, but looks amazing! Regarding mac builds... is it likely to break current builds, or are you saying that mac build + enzyme is still a future development?

[white238]

A bit outside my expertise, but looks amazing! Regarding mac builds... is it likely to break current builds, or are you saying that mac build + enzyme is still a future development?

I updated the instructions (clang 14 -> clang 19) but did not test them.

[tupek2]

OK, I've been using clang 19 on my mac for a few weeks now. I've had small issues with petsc, but maybe unrelated to that change. Thanks.

[chapman39]

ty chris. let me know how you want to delegate future prs

[ebchin]

It looks like this will turn off Tribol + Enzyme once it is merged, so exact Jacobians will no longer be available (if true). There will likely need to be some work on the Tribol side to work with ClangEnzyme instead of LLDEnzyme, so it may not be trivial to turn this back on.

[ebchin]

Let me look into Tribol's exact Jacobians before we merge this...

[ebchin]

Discussed with @white238, we will do a follow-on PR with updated Tribol soon.