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config: add a new concretizer config section

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The concretizer is going to grow to have many more configuration,
and we really need some structured config for that.

* We have the `config:concretizer` option that chooses the solver,
  but extending that is awkward (we'd need to replace a string with
  a `dict`) and the solver choice will be deprecated eventually.

* We have the `concretization` option in environments, but it's
  not a top-level config section -- it's just for environments,
  and it also only admits a string right now.

To avoid overlapping with either of these and to allow the most
extensibility in the future, this adds a new `concretizer` config
section that can be used in and outside of environments. There
is only one option right now: `reuse`.  This can expand to include
other options later.

Likely, we will soon deprecate `config:concretizer` and warn when
the user doesn't use `clingo`, and we will eventually (sometime later)
move the `together` / `separately` options from `concretization` into
the top-level `concretizer` section.

This commit just adds the new section and schema. Fully wiring it
up is TBD.
This commit is contained in:
Todd Gamblin
2022-01-17 09:54:00 -08:00
committed by Greg Becker
parent 1903e45eec
commit 800ed16e7a
5 changed files with 65 additions and 6 deletions
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11
etc/spack/defaults/config.yaml
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@@ -155,14 +155,17 @@ config:
# The concretization algorithm to use in Spack. Options are:
#
# 'original': Spack's original greedy, fixed-point concretizer. This
# algorithm can make decisions too early and will not backtrack
# sufficiently for many specs.
#
# 'clingo': Uses a logic solver under the hood to solve DAGs with full
# backtracking and optimization for user preferences. Spack will
# try to bootstrap the logic solver, if not already available.
#
# 'original': Spack's original greedy, fixed-point concretizer. This
# algorithm can make decisions too early and will not backtrack
# sufficiently for many specs. This will soon be deprecated in
# favor of clingo.
#
# See `concretizer.yaml` for more settings you can fine-tune when
# using clingo.
concretizer: clingo