share/mk/sys.vars.mk

   1 # $Id: sys.vars.mk,v 1.2 2017/01/31 07:44:45 sjg Exp $
   2 #
   3 #       @(#) Copyright (c) 2003-2009, 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 # We use the following paradigm for preventing multiple inclusion.
  17 # It relies on the fact that conditionals and dependencies are resolved
  18 # at the time they are read.
  19 #
  20 # _this ?= ${.PARSEFILE}
  21 # .if !target(__${_this}__)
  22 # __${_this}__:
  23 #
  24 .if ${MAKE_VERSION:U0} > 20100408
  25 _this = ${.PARSEDIR:tA}/${.PARSEFILE}
  26 .else
  27 _this = ${.PARSEDIR}/${.PARSEFILE}
  28 .endif
  29
  30 # if this is an ancient version of bmake
  31 MAKE_VERSION ?= 0
  32 .if ${MAKE_VERSION:M*make-*}
  33 # turn it into what we want - just the date
  34 MAKE_VERSION := ${MAKE_VERSION:[1]:C,.*-,,}
  35 .endif
  36
  37 # some useful modifiers
  38
  39 # A useful trick for testing multiple :M's against something
  40 # :L says to use the variable's name as its value - ie. literal
  41 # got = ${clean* destroy:${M_ListToMatch:S,V,.TARGETS,}}
  42 M_ListToMatch = L:@m@$${V:M$$m}@
  43 # match against our initial targets (see above)
  44 M_L_TARGETS = ${M_ListToMatch:S,V,_TARGETS,}
  45
  46 # turn a list into a set of :N modifiers
  47 # NskipFoo = ${Foo:${M_ListToSkip}}
  48 M_ListToSkip= O:u:ts::S,:,:N,g:S,^,N,
  49
  50 # type should be a builtin in any sh since about 1980,
  51 # but sadly there are exceptions!
  52 .if ${.MAKE.OS:Unknown:NBSD/OS} == ""
  53 _type_sh = which
  54 .endif
  55
  56 # AUTOCONF := ${autoconf:L:${M_whence}}
  57 M_type = @x@(${_type_sh:Utype} $$x) 2> /dev/null; echo;@:sh:[0]:N* found*:[@]:C,[()],,g
  58 M_whence = ${M_type}:M/*:[1]
  59
  60 # convert a path to a valid shell variable
  61 M_P2V = tu:C,[./-],_,g
  62
  63 # convert path to absolute
  64 .if ${MAKE_VERSION:U0} > 20100408
  65 M_tA = tA
  66 .else
  67 M_tA = C,.*,('cd' & \&\& 'pwd') 2> /dev/null || echo &,:sh
  68 .endif
  69
  70 .if ${MAKE_VERSION:U0} >= 20170130
  71 # M_cmpv allows comparing dotted versions like 3.1.2
  72 # ${3.1.2:L:${M_cmpv}} -> 3001002
  73 # we use big jumps to handle 3 digits per dot:
  74 # ${123.456.789:L:${M_cmpv}} -> 123456789
  75 M_cmpv.units = 1 1000 1000000
  76 M_cmpv = S,., ,g:_:range:@i@+ $${_:[-$$i]} \* $${M_cmpv.units:[$$i]}@:S,^,expr 0 ,1:sh
  77 .endif
  78
  79 # absoulte path to what we are reading.
  80 _PARSEDIR = ${.PARSEDIR:${M_tA}}