Todd Gamblin db07c7f611 Spec constraints and normalization now work. ...

- Specs can be "constrained" by other specs, throw exceptions when constraint
  can't be satisfied.

- Normalize will put a spec in DAG form and merge all package constraints with
  the spec.

- Ready to add concretization policies for abstract specs now.

2013-10-15 03:04:25 -07:00

..

spack

Spec constraints and normalization now work.

2013-10-15 03:04:25 -07:00