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Swap 'make cleandir' and 'make includes' for real.
Should have been part of commitid uHRFWpwUBjIz0UuR.

Original message:

Move libcrypto, librpcsvc and gnu/usr.bin/cc/include from RDIRS to PRDIRS,
and add prereq targets, so some header files are generated by BUILDUSER
during 'make prereq' instead of by root during 'make includes'.

Switch the order of 'make cleandir' and 'make includes' during 'make build'
so we don't generate many files twice.

Except for some machine@ symlinks from ${MACHINE}/stand, /usr/obj is now
clean from files generated by root during 'make build'. Those will be
cleaned up in a second step.

help, testing & ok deraadt, input from natano, further testing rpe

#	$OpenBSD: Makefile,v 1.130 2016/10/18 02:47:07 tb Exp $

#
# For more information on building in tricky environments, please see
# the list of possible environment variables described in
# /usr/share/mk/bsd.README.
#
# Building recommendations:
#
# 1) If at all possible, put this source tree in /usr/src.  If /usr/src
# must be a symbolic link, set BSDSRCDIR in the environment to point to
# the real location.
#
# 2) It is also recommended that you compile with objects outside the
# source tree. To do this, ensure /usr/obj exists or points to some
# area of disk of sufficient size.  Then do "cd /usr/src; make obj".
# This will make a symbolic link called "obj" in each directory, as
# well as populate the /usr/obj properly with directories for the
# objects.
#
# 3) It is strongly recommended that you build and install a new kernel
# before rebuilding your system. Some of the new programs may use new
# functionality or depend on API changes that your old kernel doesn't have.
#
# 4) If you are reasonably sure that things will compile OK, use the
# "make build" target supplied here. Good luck.
#
# 5) If you want to setup a cross-build environment, there is a "cross-gcc"
# target available which upon completion of: 
#	"make -f Makefile.cross TARGET=<target> cross-gcc"
# (where <target> is one of the names in the /sys/arch directory) will produce
# a set of compilation tools along with the includes in the /usr/cross/<target>
# directory. The "cross-distrib" target will build cross-tools as well as
# binaries for a given <target>.
#

.include <bsd.own.mk>	# for NOMAN, if it's there.

SUBDIR+= lib include bin libexec sbin usr.bin usr.sbin share games
SUBDIR+= gnu

SUBDIR+= sys

.if   make(clean) || make(cleandir) || make(obj)
SUBDIR+= etc distrib regress
.endif

regression-tests:
	@echo Running regression tests...
	@cd ${.CURDIR}/regress && ${MAKE} depend && exec ${MAKE} regress

includes:
	cd ${.CURDIR}/include && \
		su ${BUILDUSER} -c 'exec ${MAKE} prereq' && \
		exec ${MAKE} includes

beforeinstall:
	cd ${.CURDIR}/etc && exec ${MAKE} DESTDIR=${DESTDIR} distrib-dirs
	cd ${.CURDIR}/etc && exec ${MAKE} DESTDIR=${DESTDIR} install-mtree
	cd ${.CURDIR}/include && exec ${MAKE} includes

afterinstall:
.ifndef NOMAN
	cd ${.CURDIR}/share/man && exec ${MAKE} makedb
	cd ${.CURDIR}/distrib/sets && exec ${MAKE} makedb
.endif

.ifdef DESTDIR
build:
	@echo cannot build with DESTDIR set
	@false
.else
build:
.ifdef GLOBAL_AUTOCONF_CACHE
	cp /dev/null ${GLOBAL_AUTOCONF_CACHE}
.endif
	@if [[ `id -u` -ne 0 ]]; then \
		echo $@ must be called by root >&2; \
		false; \
	fi
	cd ${.CURDIR}/share/mk && exec ${MAKE} install
	exec ${MAKE} cleandir
	exec ${MAKE} includes
	cd ${.CURDIR}/lib && \
	    su ${BUILDUSER} -c '${MAKE} depend && exec ${MAKE}' && \
	    NOMAN=1 exec ${MAKE} install
	cd ${.CURDIR}/gnu/lib && \
	    su ${BUILDUSER} -c '${MAKE} depend && exec ${MAKE}' && \
	    NOMAN=1 exec ${MAKE} install
	su ${BUILDUSER} -c '${MAKE} depend && exec ${MAKE}' && \
	    exec ${MAKE} install
	/bin/sh ${.CURDIR}/distrib/sets/makeetcset ${.CURDIR} ${MAKE}
.endif

CROSS_TARGETS=cross-env cross-dirs cross-obj cross-includes cross-binutils \
	cross-gcc cross-tools cross-lib cross-bin cross-etc-root-var \
	cross-depend cross-clean cross-cleandir

.if !defined(TARGET)
${CROSS_TARGETS}:
	@echo "TARGET must be set for $@"; exit 1
.else
. include "Makefile.cross"
.endif # defined(TARGET)

.PHONY: ${CROSS_TARGETS} \
	build regression-tests includes beforeinstall afterinstall \
	all depend

.include <bsd.subdir.mk>