1# $Id: options.mk,v 1.13 2020/08/19 17:51:53 sjg Exp $ 2# 3# @(#) Copyright (c) 2012, Simon J. Gerraty 4# 5# This file is provided in the hope that it will 6# be of use. There is absolutely NO WARRANTY. 7# Permission to copy, redistribute or otherwise 8# use this file is hereby granted provided that 9# the above copyright notice and this notice are 10# left intact. 11# 12# Please send copies of changes and bug-fixes to: 13# sjg@crufty.net 14# 15 16# Inspired by FreeBSD bsd.own.mk, but intentionally simpler and more flexible. 17 18# Options are normally listed in either OPTIONS_DEFAULT_{YES,NO} 19# We convert these to ${OPTION}/{yes,no} in OPTIONS_DEFAULT_VALUES. 20# We add the OPTIONS_DEFAULT_NO first so they take precedence. 21# This allows override of an OPTIONS_DEFAULT_YES by adding it to 22# OPTIONS_DEFAULT_NO or adding ${OPTION}/no to OPTIONS_DEFAULT_VALUES. 23# An OPTIONS_DEFAULT_NO option can only be overridden by putting 24# ${OPTION}/yes in OPTIONS_DEFAULT_VALUES. 25# A makefile may set NO_* (or NO*) to indicate it cannot do something. 26# User sets WITH_* and WITHOUT_* to indicate what they want. 27# We set ${OPTION_PREFIX:UMK_}* which is then all we need care about. 28OPTIONS_DEFAULT_VALUES += \ 29 ${OPTIONS_DEFAULT_NO:O:u:S,$,/no,} \ 30 ${OPTIONS_DEFAULT_YES:O:u:S,$,/yes,} 31 32OPTION_PREFIX ?= MK_ 33 34# NO_* takes precedence 35# If both WITH_* and WITHOUT_* are defined, WITHOUT_ wins unless 36# DOMINANT_* is set to "yes" 37# Otherwise WITH_* and WITHOUT_* override the default. 38.for o in ${OPTIONS_DEFAULT_VALUES:M*/*} 39.if defined(NO_${o:H}) || defined(NO${o:H}) 40# we cannot do it 41${OPTION_PREFIX}${o:H} ?= no 42.elif defined(WITH_${o:H}) && defined(WITHOUT_${o:H}) 43# normally WITHOUT_ wins 44DOMINANT_${o:H} ?= no 45${OPTION_PREFIX}${o:H} ?= ${DOMINANT_${o:H}} 46.elif ${o:T:tl} == "no" 47.if defined(WITH_${o:H}) 48${OPTION_PREFIX}${o:H} ?= yes 49.else 50${OPTION_PREFIX}${o:H} ?= no 51.endif 52.else 53.if defined(WITHOUT_${o:H}) 54${OPTION_PREFIX}${o:H} ?= no 55.else 56${OPTION_PREFIX}${o:H} ?= yes 57.endif 58.endif 59.endfor 60 61# OPTIONS_DEFAULT_DEPENDENT += FOO_UTILS/FOO 62# If neither WITH[OUT]_FOO_UTILS is set, (see rules above) 63# use the value of ${OPTION_PREFIX}FOO 64.for o in ${OPTIONS_DEFAULT_DEPENDENT:M*/*:O:u} 65.if defined(NO_${o:H}) || defined(NO${o:H}) 66# we cannot do it 67${OPTION_PREFIX}${o:H} ?= no 68.elif defined(WITH_${o:H}) && defined(WITHOUT_${o:H}) 69# normally WITHOUT_ wins 70DOMINANT_${o:H} ?= no 71${OPTION_PREFIX}${o:H} ?= ${DOMINANT_${o:H}} 72.elif defined(WITH_${o:H}) 73${OPTION_PREFIX}${o:H} ?= yes 74.elif defined(WITHOUT_${o:H}) 75${OPTION_PREFIX}${o:H} ?= no 76.else 77${OPTION_PREFIX}${o:H} ?= ${${OPTION_PREFIX}${o:T}} 78.endif 79.endfor 80.undef OPTIONS_DEFAULT_VALUES 81.undef OPTIONS_DEFAULT_NO 82.undef OPTIONS_DEFAULT_YES 83