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Split the variable BUILD_DEFS into those that are defined by packages
and those that are defined by the infrastructure (_BUILD_DEFS). This
allows the build-defs-message target to be moved to the end of
bsd.pkg.mk. Now it prints the correct result even in unprivileged
builds, which had been wrong due to the order in which the files have
been included. For example, ${UNPRIVILEGED_USER} was displayed as (not
defined) although its value was defined, which could be checked with
"bmake show-var".

Tested with one package that _does_ define BUILD_DEFS and with one that
doesn't. The behavior stays the same.

# $NetBSD: bsd.hacks.mk,v 1.3 2006/07/15 23:58:52 rillig Exp $
#
# Copyright (c) 2004 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Johnny C. Lam.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#        This product includes software developed by the NetBSD
#        Foundation, Inc. and its contributors.
# 4. Neither the name of The NetBSD Foundation nor the names of its
#    contributors may be used to endorse or promote products derived
#    from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.

# This Makefile fragment automatically includes the necessary hacks to
# make the package build correctly by including the package's hacks.mk
# file if it exists.
#
# An example package hacks.mk:
#
# -------------8<-------------8<-------------8<-------------8<-------------
# .if !defined(FOO_HACKS_MK)
# FOO_HACKS_MK=	defined
#
# ### [Sun Nov 14 02:08:31 EST 2004 : jlam]
# ### arm GCC 2.95.x optimisation bug tickled when compiling
# ### lib/funkyfile.c.  Require a more recent version of GCC as a
# ### workaround and patch lib/funkyfile.c (patch-ae).
# ###
# .if !empty(MACHINE_ARCH:Marm*)
# PKG_HACKS+=	optimisation
# GCC_REQD+=	3.0
# .endif
#
# .endif  # FOO_HACKS_MK
# -------------8<-------------8<-------------8<-------------8<-------------

PKG_HACKS?=	# empty

.if exists(${PKGDIR}/hacks.mk)
.  include "${PKGDIR}/hacks.mk"
.endif

# Record any package hacks that we use in the installed package.
.if !empty(PKG_HACKS)
_BUILD_DEFS+=	PKG_HACKS
.endif