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.
Features:
- a second axis can now be displayed in rrd_graph. look for
documentation on second-axis. feature was sponsored by VoltWerk.
Bugfixes:
- rrd_fetch: is more careful when seeking. it should not try to seek
outside the file anymore.
- rrd_graph: CDEF:x= raises an error now and does not segfault
- rrd_graph: --font TITLE:12: problem fixed (affecting cacti)
- rrd_graph: make VDEF work with SHIFT (bug #177)
- rrd_xport: make it work when exporting datasources without
uniform step size.
- rrd_tool: rely on function return values and not on errno. (bug #176)
to trigger/signal a rebuild for the transition 5.8.8 -> 5.10.0.
The list of packages is computed by finding all packages which end
up having either of PERL5_USE_PACKLIST, BUILDLINK_API_DEPENDS.perl,
or PERL5_PACKLIST defined in their make setup (tested via
"make show-vars VARNAMES=...").
