share/mk/options.mk

   1 # $Id: options.mk,v 1.10 2014/02/11 18:34:48 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.
  28 OPTIONS_DEFAULT_VALUES += \
  29         ${OPTIONS_DEFAULT_NO:O:u:S,$,/no,} \
  30         ${OPTIONS_DEFAULT_YES:O:u:S,$,/yes,}
  31
  32 OPTION_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
  44 DOMINANT_${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
  70 DOMINANT_${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