This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.
Soprano (formerly known as QRDF) is a library which provides a highly
usable object-oriented C++/Qt4 framework for RDF data. It uses
different RDF storage solutions as backends through a simple plugin
system. Soprano is targetted at desktop applications that need a RDF
data storage solution. It has been optimized for easy usage and
simplicity.
