The solves now supports key:=val syntax for multivalued variants in specs originating from input, externals, requirements, directives and when conditions
Signed-off-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>
This PR is a step towards treating externals as concrete specs. Specifically, it moves the optimization weights of external nodes into the group of "reused" specs, and doesn't count externals as specs to be built.
It still keeps the one to many mapping between an external spec in `packages.yaml` and the corresponding specs in the DB. To make it such that an hashed external is preferred to a non-hashed one, the version weights of externals are demoted at lowest priority.
**Change in behavior**:
- Having the possibility, Spack will now prefer to mix compilers in a DAG, and use the latest version possible for each node, rather than using a single compiler and employ old versions of some nodes because of conflicts
- In general, using externals by default is now triggered by putting their weights in the "reused" group. This means that any penalty they might induce will never have the same priority as something that needs to be built. This behavior reflects reality, but changes some default choices from the previous state.
Modifications:
- External nodes weights are now moved to the group of "reused" specs
- Runtimes are treated as concrete as well (to avoid that e.g.`gcc` is not selected because it "builds" the runtime package)
- Shuffle version weights, so that externals are least preferred (counterbalanced by the fact that they are in the "reused" groups)
- Split provider weights on edges from version badness on edges
Signed-off-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>
When indexing top level specs, eg, in s3://spack-binaries/develop,
do not sync manifests from all the stacks. Instead, add the path
to the spec manifests to the url to sync, so that only items in
s3://spack-binaries/develop/v3/manifests/spec are copied to the
local system.
Allow rebuild-index to continue if fetching some specs fails
for any reason, and issue a warning indicating which manifest
is associated with the failed fetch.
