The hard-coded search order is now removed. The search order is now constructed from the depends variable in the qdocconf file. The basic idea is that qdoc is run once. It gets a list of all the qdocconf files for the modules in Qt5. First, qdoc runs in -prepare mode for each qdocconf file in the list. It generates the index file for each module, but these index files are never used. At the end of the -prepare phase for each module, qdoc keeps the tree structure for the module in a collection of trees. Second, qdoc runs in -generate mode for each qdocconf file in the list. But now it uses the existing tree for that module, so it doesn't have to read the sources files again, and it doesn't have to read any index files. Now it generates the docs for each module. The runtime for qdoc has been reduced by 90% when running qdoc for all of Qt5 on a not so new iMac. Before this update, qdoc took about 10 minutes to generate docs for Qt5. Now it takes a little over 1 minute. The new way to run qdoc is described in the Qt bug report referenced here. Note that running qdoc this new (old) way also generates fewer qdoc errors than when running qdoc the old way. This indicates that the index files qdoc uses when running the old way are incomplete. Note also that the old way of running qdoc is not affected by this update. The old way is still required for running qdoc in the current qmake/make system. That process must be changed to be able to use the faster qdoc. The details are provided in the Qt bug report. Change-Id: Ibec41d6fbaa9fc8cd070a05d04357bd02c4478f0 Task-number: QTBUG-41705 Reviewed-by: Topi Reiniö <topi.reinio@digia.com>