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authorTodd Gamblin <tgamblin@llnl.gov>2015-12-21 15:35:47 -0800
committerTodd Gamblin <tgamblin@llnl.gov>2015-12-21 15:35:47 -0800
commitfe0fdf60b46716fa20318c627ea80ff4e3398263 (patch)
tree44566c2013fc4336da6baee40948b66070688f2a /etc
parentc3aaf005e2ec2844fa02a60414978692b67727a4 (diff)
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Add ability to prefer particular versions in packages.
- Adding `preferred=True` to a version directive will change its sort order in concretization. - This provides us a rudimentary ability to keep the Spack stack stable as new versions are added. - Having multiple stacks will come next, but this at least allows us to specify default versions of things instead of always taking the newest.
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