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.
This package is based on wip/evas, originally packaged by airhead AT
users.sf.net and maintained by YazzY (yazzy AT yazzy.org).
Evas is a clean display canvas API for several target display systems
that can draw anti-aliased text, smooth super and sub-sampled scaled
images, alpha-blend objects, and more.
