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.
Redland is a set of free software libraries that provide support for the
Resource Description Framework (RDF).
* Modular, object based libraries and APIs for manipulating the RDF graph,
triples, URIs and Literals.
* Storage for graphs in memory and persistently with Sleepycat/Berkeley DB,
MySQL 3-5, PostgreSQL, AKT Triplestore, SQLite, files or URIs.
* Support for multiple syntaxes for reading and writing RDF as RDF/XML,
N-Triples and Turtle Terse RDF Triple Language, RSS and Atom syntaxes via
the Raptor RDF Parser Toolkit.
* Querying with SPARQL and RDQL using the Rasqal RDF Query Library.
* Data aggregation and recording provenance support with Redland contexts.
* Language Bindings in Perl, PHP, Python and Ruby via the Redland Bindings
package.
* Command line utility programs rdfproc (RDF), rapper (parsing) and roqet
(query).
* Portable, fast and with no known memory leaks.
