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.
Enca is an Extremely Naive Charset Analyser. It detects character
set and encoding of text files and can also convert them to other
encodings. The charset detecting functionality is also available as
a library.
Enca currently can determine 8bit charsets of Belarussian, Bulgarian,
Croatian, Czech, Estonian, Hungarian, Latvian, Lithuanian, Polish,
Russian, Slovak, Slovene, Ukrainian, and Chinese texts and also
some multibyte encodings, independent on language (provided it's
some European language).
