8281a0c5fe
Spack doesn't have an easy way to say something like "If I build package X, then I *need* version Y": * If you specify something on the command line, then you ensure that the constraints are applied, but the package is always built * Likewise if you `spack add X...`` to your environment, the constraints are guaranteed to hold, but the environment always builds the package * You can add preferences to packages.yaml, but these are not guaranteed to hold (Spack can choose other settings) This commit adds a 'require' subsection to packages.yaml: the specs added there are guaranteed to hold. The commit includes documentation for the feature. Co-authored-by: Massimiliano Culpo <massimiliano.culpo@gmail.com> |
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