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.
Graphite is a project under development within SIL's Non-Roman Script
Initiative and Language Software Development groups to provide
rendering capabilities for complex non-Roman writing systems.
Its smart-font engine is the bit that takes a Unicode string, font
formatting information (features, size, etc.), and a font, and returns
a set of positioned glyphs. Graphite also does more than this, in
that it can handle cursor tracking and interaction with the
application for string selection, etc.
