In #44425, we add stricter variant audits that catch expressions that can never match.
This fixes 13 packages that had this type of issue.
Most packages had lingering spec expressions from before conditional variants with
`when=` statements were added. For example:
* Given `conflicts("+a", when="~b")`, if the package has since added
`variant("a", when="+b")`, the conflict is no longer needed, because
`a` and `b` will never exist together.
* Similarly, two packages that depended on `py-torch` depended on
`py-torch~cuda~cudnn`, which can't match because the `cudnn` variant
doesn't exist when `cuda` is disabled. Note that neither `+foo` or `~foo`
match (intentionally) if the `foo` variant doesn't exist.
* Some packages referred to impossible version/variant combinations, e.g.,
`ceed@1.0.0+mfem~petsc` when the `petsc` variant only exist at version `2`
or higher.
Some of these correct real issues (e.g. the `py-torch` dependencies would have never
worked). Others simply declutter old code in packages by making all constraints
consistent with version and variant updates.
The only one of these that I think is not all that useful is the one for `acts`,
where looping over `cxxstd` versions and package versions ends up adding some
constraints that are impossible. The additional dependencies could never have
happened and the code is more complicated with the needed extra constriant.
I think *probably* the best thing to do in `acts` is to just not to use a loop
and to write out the constraints explicitly, but maybe the code is easier to
maintain as written.
Signed-off-by: Todd Gamblin <tgamblin@llnl.gov>
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