Werner's Miscellanea, Assorted small items that don't fit anywhere else http://projects.qi-hardware.com/index.php/p/wernermisc/

Werner Almesberger 0bc4b6046b qpkg: added detection of cyclic dependencies ... We define a cyclic dependency as the possibility (!) of the prerequisites of a package X including a package that depends on X, and issue an error if encountering such a situation. Note that, if the dependencies of X can be resolved in a manner that does not include the cyclic dependency, qpkg will still fail if it encounters the cycle. Also note that qpkg (at least so far) does no perform an exhaustive search to ferret out cyclic dependencies. Furthermore, we don't consider that a cyclic dependency may not necessarily imply a real life problem. E.g., if a package A contains elements X and Y, with X needing package B, and the content of package B has a run-time dependency on Y, the cyclic dependency between A and B would not exist when considering its constituents. Since we don't have this information, we just err on the side of caution. - qpkg.h (enum flags): divide flags into categories (parse-time and run-time) and add flag QPKG_ADDING to mark packets whose dependencies we are processing - prereq.c (resolve, prereq): track which packages we're tentatively considering for installation and detect cyclic dependencies - test/cyclic: regression test for detection of cyclic dependencies - TODO: updated with recent changes		2010-11-21 20:31:20 -03:00
qpkg	qpkg: added detection of cyclic dependencies	2010-11-21 20:31:20 -03:00