0139288ced
Add a "require" directive to packages, which functions exactly like requirements specified in packages.yaml (uses the same fact-generation logic); update both to allow making the requirement conditional. * Packages may now use "require" to add constraints. This can be useful for something like "require(%gcc)" (where before we had to add a conflict for every compiler except gcc). * Requirements (in packages.yaml or in a "require" directive) can be conditional on a spec, e.g. "require(%gcc, when=@1.0.0)" (version 1.0.0 can only build with gcc). * Requirements may include a message which clarifies why they are needed. The concretizer assigns a high priority to errors which generate these messages (in particular over errors for unsatisfied requirements that do not produce messages, but also over a number of more-generic errors). |
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