80 lines
2.5 KiB
Makefile
80 lines
2.5 KiB
Makefile
# $Id: options.mk,v 1.10 2014/02/11 18:34:48 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:O:u:S,$,/no,} \
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${OPTIONS_DEFAULT_YES: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 ${OPTIONS_DEFAULT_VALUES:M*/*}
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.if defined(NO_${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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