cyclic run depends

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Hi,

in a package.xml file it is possible to declare a package only as run_depend without declaring it as a build_depend. So you can have two packages depending on each other without having problems building them.

When you try to auto generate documentation for these packages, using the buildfarm, the script first scans the dependencies and constructs a directed graph in order to know which package should be build first. Building fails because you can not have a circular dependency when you are building packages.

The question is whether, a run_depend on a packet implies that you are also build_depend on that packet? This would seem logical. Otherwise, I can not see a reason why you can not have cyclic run depends between packages.