Update config_machines.xml to upstream E3SM revision ec75ebef

[Copilot]

Syncs mache/cime_machine_config/config_machines.xml with upstream E3SM commit ec75ebef661bf4c7ecf72bdcc1710eebdb257d43.

pm-cpu (affected machine):

• Generic <modules> block split: craype-accel-host moved into a compiler="!nvidia" block (non-nvidia compilers only), while craype/2.7.35, cray-mpich/9.0.1, and cmake/3.30.2 remain in an unrestricted block
• mache/spack/templates/pm-cpu_nvidia_mpich.yaml: removed craype-accel-host from the nvidia compiler's modules list to match the upstream change

Other upstream changes:

• ghci-oci machine definition removed
• Trailing whitespace cleaned in a few other machine sections

Bug fix in mache/spack/config_machines.py:

• _matches_selector now supports CIME's negation syntax (e.g. compiler="!nvidia"). Previously, patterns beginning with ! were treated as literal regexes that never matched any compiler string, causing modules tagged compiler="!nvidia" to be silently excluded for all compilers (including intel, gnu, amdclang). The fix detects the leading ! and negates the regex match.
• Added test_extract_machine_config_negation_selector in tests/test_spack_config_machines.py to cover the nvidia / !nvidia selector pair.

Checklist

• User's Guide has been updated if needed
• Developer's Guide has been updated if needed
• API documentation lists any new or modified class, method, or function
• Documentation builds cleanly and changes look as expected
• Tests pass and new features are covered by tests
• PR description includes a summary and any relevant issue references
• Testing comment, if appropriate, in the PR documents testing used to verify the changes

[xylar]

@copilot, are changes likely to be needed to mache/spack/templates/pm-cpu_nvidia_mpich.yaml and mache/spack/templates/pm-cpu_nvidia_mpich.yaml as a result of the updates to mache/cime_machine_config/config_machines.xml?

[Copilot]

@copilot, are changes likely to be needed to mache/spack/templates/pm-cpu_nvidia_mpich.yaml and mache/spack/templates/pm-cpu_nvidia_mpich.yaml as a result of the updates to `mache/cime_machine_con...

Yes — the upstream config_machines.xml change moved craype-accel-host into a compiler="!nvidia" block, meaning it should no longer be loaded for the nvidia compiler on pm-cpu. pm-cpu_nvidia_mpich.yaml had craype-accel-host in the compiler's modules list, so I've removed it in commit 6235d0a.

[xylar]

@copilot, do the modules mache/spack/*.py already understand compiler="!nvidia" or is that something we need to add support for?

[Copilot]

@copilot, do the modules mache/spack/*.py already understand compiler="!nvidia" or is that something we need to add support for?

They did not — _matches_selector was using re.fullmatch(pattern, value) directly, so compiler="!nvidia" (a CIME negation pattern) was treated as a literal regex that never matches any compiler string. This meant modules tagged compiler="!nvidia" were silently excluded for all compilers, including intel and gnu.

I've fixed _matches_selector to detect the leading ! and negate the match (commit 792329d), and added a test covering the nvidia / !nvidia selector pair.

[xylar]

Looks good!