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Add optional caching of extracted build options. As the number of users
of this feature has exploded over recent years, this avoids quadratic
complexity for many packages during scan and build phase of a bulk
build. Pbulk logic for exploiting this feature will be committed
separately. Over all, this saves ~66% for wm/xfce4-wm
with initially empty cache and ~90% when the cache is populated. Total
scan time can be cut in half.

# $NetBSD: pkg-build-options.mk,v 1.11 2016/12/17 23:41:51 joerg Exp $
#
# This procedure determines the PKG_OPTIONS that have been in effect
# when the package ${pkgbase} has been built. When the package is not
# yet installed, the current PKG_OPTIONS are queried.
#
# Parameters:
#	pkgbase
#		The basename of the package.
#
# Returns:
#	PKG_BUILD_OPTIONS.${pkgbase}
#		The build options of the package.
#
# Example:
#	pkgbase := wine
#	.include "../../mk/pkg-build-options.mk"
#
# Keywords: options pkg-build-options PKG_BUILD_OPTIONS
#

.include "bsd.fast.prefs.mk"

# For the check for inclusion from non-buildlink3.mk, it is irrelevant
# whether BUILDLINK_TREE was empty or undefined, so defining it here
# avoids dealing one case.
BUILDLINK_TREE?=

# Counting words doesn't work as expected for empty strings, they
# still have one word.  Older make doesn't like the code without
# variable assignment for unknown reasons.
_BUILDLINK_TREE_WITH:=	${BUILDLINK_TREE:M-*:[\#]}
_BUILDLINK_TREE_WITHOUT:= ${BUILDLINK_TREE:N-*:[\#]}
.if (empty(BUILDLINK_TREE:M-*) && empty(BUILDLINK_TREE:N-*)) || \
    (!empty(BUILDLINK_TREE:M-*) && !empty(BUILDLINK_TREE:N-*) && \
     ${_BUILDLINK_TREE_WITH} == ${_BUILDLINK_TREE_WITHOUT})
.  for b in ${pkgbase}
PKG_BUILD_OPTIONS.${b}=
PKG_FAIL_REASON+=	"[pkg-build-options.mk] This file may only be included from a buildlink3.mk file (pkgbase=${b})."
.  endfor
.else
.  for b in ${pkgbase}
.    if !defined(PKG_BUILD_OPTIONS.${b}) && defined(PBULK_CACHE_DIRECTORY)
.sinclude "${PBULK_CACHE_DIRECTORY}/build-options.${b}"
.    endif
.    if !defined(PKG_BUILD_OPTIONS.${b})
PKG_BUILD_OPTIONS.${b}!= \
	echo ""; \
	${PKG_INFO} -Q PKG_OPTIONS ${b} 2>/dev/null \
	|| { cd ${BUILDLINK_PKGSRCDIR.${b}} \
	     && ${MAKE} ${MAKEFLAGS} show-var VARNAME=PKG_OPTIONS; }
.        if defined(PBULK_CACHE_DIRECTORY)
_PKG_BUILD_OPTIONS.${b}!= \
	echo PKG_BUILD_OPTIONS.${b:Q}=${PKG_BUILD_OPTIONS.${b:Q}} > ${PBULK_CACHE_DIRECTORY:Q}/build-options.${pkgbase}.$$$$; \
	mv ${PBULK_CACHE_DIRECTORY:Q}/build-options.${pkgbase}.$$$$ ${PBULK_CACHE_DIRECTORY:Q}/build-options.${pkgbase}
.        endif
MAKEFLAGS+=	PKG_BUILD_OPTIONS.${b}=${PKG_BUILD_OPTIONS.${b}:Q}
.    endif

MAKEVARS+=	PKG_BUILD_OPTIONS.${b}
.  endfor
.endif