113 lines
3.6 KiB
Makefile
113 lines
3.6 KiB
Makefile
# $Id: options.mk,v 1.19 2021/10/03 16:29:51 sjg Exp $
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#
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# @(#) Copyright (c) 2012, Simon J. Gerraty
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#
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# This file is provided in the hope that it will
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# be of use. There is absolutely NO WARRANTY.
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# Permission to copy, redistribute or otherwise
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# use this file is hereby granted provided that
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# the above copyright notice and this notice are
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# left intact.
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#
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# Please send copies of changes and bug-fixes to:
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# sjg@crufty.net
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#
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# Inspired by FreeBSD bsd.own.mk, but intentionally simpler and more flexible.
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# Options are normally listed in either OPTIONS_DEFAULT_{YES,NO}
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# We convert these to ${OPTION}/{yes,no} in OPTIONS_DEFAULT_VALUES.
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# We add the OPTIONS_DEFAULT_NO first so they take precedence.
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# This allows override of an OPTIONS_DEFAULT_YES by adding it to
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# OPTIONS_DEFAULT_NO or adding ${OPTION}/no to OPTIONS_DEFAULT_VALUES.
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# An OPTIONS_DEFAULT_NO option can only be overridden by putting
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# ${OPTION}/yes in OPTIONS_DEFAULT_VALUES.
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# A makefile may set NO_* (or NO*) to indicate it cannot do something.
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# User sets WITH_* and WITHOUT_* to indicate what they want.
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# We set ${OPTION_PREFIX:UMK_}* which is then all we need care about.
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OPTIONS_DEFAULT_VALUES += \
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${OPTIONS_DEFAULT_NO:U:O:u:S,$,/no,} \
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${OPTIONS_DEFAULT_YES:U:O:u:S,$,/yes,}
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OPTION_PREFIX ?= MK_
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# NO_* takes precedence
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# If both WITH_* and WITHOUT_* are defined, WITHOUT_ wins unless
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# DOMINANT_* is set to "yes"
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# Otherwise WITH_* and WITHOUT_* override the default.
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.for o in ${OPTIONS_DEFAULT_VALUES:M*/*}
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.if defined(WITH_${o:H}) && ${WITH_${o:H}} == "no"
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# a common miss-use - point out correct usage
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.warning use WITHOUT_${o:H}=1 not WITH_${o:H}=no
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.endif
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.if defined(NO_${o:H}) || defined(NO${o:H})
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# we cannot do it
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${OPTION_PREFIX}${o:H} ?= no
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.elif defined(WITH_${o:H}) && defined(WITHOUT_${o:H})
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# normally WITHOUT_ wins
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DOMINANT_${o:H} ?= no
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${OPTION_PREFIX}${o:H} ?= ${DOMINANT_${o:H}}
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.elif ${o:T:tl} == "no"
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.if defined(WITH_${o:H})
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${OPTION_PREFIX}${o:H} ?= yes
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.else
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${OPTION_PREFIX}${o:H} ?= no
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.endif
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.else
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.if defined(WITHOUT_${o:H})
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${OPTION_PREFIX}${o:H} ?= no
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.else
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${OPTION_PREFIX}${o:H} ?= yes
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.endif
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.endif
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.endfor
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# OPTIONS_DEFAULT_DEPENDENT += FOO_UTILS/FOO
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# If neither WITH[OUT]_FOO_UTILS is set, (see rules above)
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# use the value of ${OPTION_PREFIX}FOO
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.for o in ${OPTIONS_DEFAULT_DEPENDENT:M*/*:O:u}
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.if defined(NO_${o:H}) || defined(NO${o:H})
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# we cannot do it
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${OPTION_PREFIX}${o:H} ?= no
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.elif defined(WITH_${o:H}) && defined(WITHOUT_${o:H})
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# normally WITHOUT_ wins
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DOMINANT_${o:H} ?= no
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${OPTION_PREFIX}${o:H} ?= ${DOMINANT_${o:H}}
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.elif defined(WITH_${o:H})
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${OPTION_PREFIX}${o:H} ?= yes
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.elif defined(WITHOUT_${o:H})
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${OPTION_PREFIX}${o:H} ?= no
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.else
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${OPTION_PREFIX}${o:H} ?= ${${OPTION_PREFIX}${o:T}}
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.endif
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.endfor
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# allow displaying/describing set options
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.set_options := ${.set_options} \
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${OPTIONS_DEFAULT_VALUES:H:N.} \
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${OPTIONS_DEFAULT_DEPENDENT:U:H:N.} \
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# this can be used in .info as well as target below
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OPTIONS_SHOW ?= ${.set_options:O:u:@o@${OPTION_PREFIX}$o=${${OPTION_PREFIX}$o}@}
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# prefix for variables describing options
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OPTION_DESCRIPTION_PREFIX ?= DESCRIPTION_
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OPTION_DESCRIPTION_SEPARATOR ?= ==
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OPTIONS_DESCRIBE ?= ${.set_options:O:u:@o@${OPTION_PREFIX}$o=${${OPTION_PREFIX}$o}${${OPTION_DESCRIPTION_PREFIX}$o:S,^, ${OPTION_DESCRIPTION_SEPARATOR} ,1}${.newline}@}
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.if !commands(show-options)
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show-options: .NOTMAIN .PHONY
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@echo; echo "${OPTIONS_SHOW:ts\n}"; echo
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.endif
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.if !commands(describe-options)
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describe-options: .NOTMAIN .PHONY
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@echo; echo "${OPTIONS_DESCRIBE}"; echo
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.endif
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# we expect to be included more than once
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.undef OPTIONS_DEFAULT_DEPENDENT
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.undef OPTIONS_DEFAULT_NO
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.undef OPTIONS_DEFAULT_VALUES
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.undef OPTIONS_DEFAULT_YES
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