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.
CLucene is a high-performance, scalable, cross platform, full-featured,
open-source indexing and searching API. It is written in C++.
CLucene is a port of the very popular Java Lucene text search engine API.
Specifically, CLucene is the guts of a search engine, the hard stuff.
You write the easy stuff, the UI and the process of selecting and parsing your
data files to pump them into the search engine yourself.
CLucene aims to be a good alternative to Java Lucene when performance really
matters or if you want to stick to good old C++.
