Todd Gamblin 3519a17624 specs: avoid traversing specs when parsing ...

The Spec parser currently calls `spec.traverse()` after every parse, in
order to set the platform if it's not set.  We don't need to do a full
traverse -- we can just check the platforrm as new specs are parsed.

This takes about a second off the time required to import all packages in
Spack (from 8s to 7s).

- [x] simplify platform-setting logic in `SpecParser`.

2020-01-29 21:15:58 -08:00

..

spack

specs: avoid traversing specs when parsing

2020-01-29 21:15:58 -08:00