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.
version, and packages should switch to it as they are deemed compatible.
blurb:
S-Lang is a C programmer's library that includes routines for the rapid
development of sophisticated, user friendly, multi-platform applications.
The S-Lang library includes the following:
- Low level tty input routines for reading single characters at a
time, as well as low-level terminal-independent routines for
manipulating the display of a terminal.
- Keymap routines for defining keys and manipulating multiple
keymaps.
- High level screen management routines for manipulating both
monochrome and color terminals. These routines are very efficient.
- Routines for reading single line input with line editing and recall
capabilities.
- Searching functions: both ordinary searches and regular expression
searches.
- An embedded stack-based language interpreter with a C-like syntax.
- A malloc debugging package
