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I have to admit that cpp.req can be slow and often fails in an ugly
manner. To address these issues, this change introduces "hierarchical
processing". Consider the package libgtk+2-devel. Only a few header
files from this package can be included directly, and these files in
turn include other "private" headers which are protected against direct
inclusion. The idea is then that only those few files with the highest
rank have to be processed explicitly, and most of the "private" files
can be processed implicitly as they are included on behalf of
higher-ranking files.
To implement the idea, somehow we have to sort the files by their rank.
This probably has to involve some guesswork. However, assigning higher
ranks to shorter filenames seems to produce nice guesses. More precisely,
files are sorted by shorter directory names and then by shorter basenames.
Another possible criteria which is not currently implemented is also to
take into account the number of path components in a directory name.
The result is pretty amazing: the amount of time needed to process
libgtk+2-devel headers is reduced from 150s to 5s. Notably <gtk/gtk.h>
includes 241 packaged files. This is also due to other optimizations:
packaged files are excluded from dependencies early on, and each
required filename gets passed to FindPackage only once.
e4835167bb