Todd Gamblin 3b1898b8e4 Fix SPACK-40: Finish adding variant directive. ... - Variants are now declarable in packages using the variant() directive. - Variants are checked - you can't just ask for a random variant, it has to be declared. - conditional logic (@when, if, '+debug' in spec, etc.) still required in package to implement variant.		2015-05-10 12:24:03 -07:00
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spack	Fix SPACK-40: Finish adding variant directive.	2015-05-10 12:24:03 -07:00