stack in the reverse order that show-depends-pkgpaths outputs them.
This makes the top element of the stack the first child dependency
that was marked as "pushed". This change orders the default "postfix"
output of this script in such a way that for any package listed in
the output, there is no earlier package that depends on it.
In other words, you can take the default output and install from first
to last and never need to install any dependencies, because any
dependencies are guaranteed to have already been installed earlier.
used by the "make show-depends-pkgpaths" process to short-circuit some
of the rather lengthy computations that are spread throughout bsd.pkg.mk
and files included by bsd.pkg.mk. This causes the script to speed up
noticeably.
Also, rename the _DEPENDS_DEPTH_FIRST_CMD variable to _DEPENDS_WALK_CMD
for brevity and to allow for other implementations in the future.
the code that performs the dependency graph traversal (in depth-first
fashion). This script has a hook that allows executing a shell command
line upon visiting a dependency's package directory in either prefix
or postfix order, and may be used to simplify the code in bsd.pkg.mk
that iterates over dependencies.
This awk script requires the target "show-depends-pkgpaths", which is
defined in a new Makefile pkgsrc/mk/bsd.utils.mk. This file should
accumulate "utility" targets that current exist in bsd.pkg.mk, i.e.,
"helper" targets for various actions.
