81 lines
2.3 KiB
Makefile
81 lines
2.3 KiB
Makefile
# $Id: sys.vars.mk,v 1.3 2018/02/06 00:51:53 sjg Exp $
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#
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# @(#) Copyright (c) 2003-2009, 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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# We use the following paradigm for preventing multiple inclusion.
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# It relies on the fact that conditionals and dependencies are resolved
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# at the time they are read.
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#
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# _this ?= ${.PARSEFILE}
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# .if !target(__${_this}__)
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# __${_this}__:
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#
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.if ${MAKE_VERSION:U0} > 20100408
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_this = ${.PARSEDIR:tA}/${.PARSEFILE}
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.else
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_this = ${.PARSEDIR}/${.PARSEFILE}
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.endif
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# if this is an ancient version of bmake
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MAKE_VERSION ?= 0
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.if ${MAKE_VERSION:M*make-*}
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# turn it into what we want - just the date
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MAKE_VERSION := ${MAKE_VERSION:[1]:C,.*-,,}
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.endif
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# some useful modifiers
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# A useful trick for testing multiple :M's against something
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# :L says to use the variable's name as its value - ie. literal
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# got = ${clean* destroy:${M_ListToMatch:S,V,.TARGETS,}}
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M_ListToMatch = L:@m@$${V:M$$m}@
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# match against our initial targets (see above)
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M_L_TARGETS = ${M_ListToMatch:S,V,_TARGETS,}
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# turn a list into a set of :N modifiers
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# NskipFoo = ${Foo:${M_ListToSkip}}
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M_ListToSkip= O:u:S,^,N,:ts:
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# type should be a builtin in any sh since about 1980,
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# but sadly there are exceptions!
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.if ${.MAKE.OS:Unknown:NBSD/OS} == ""
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_type_sh = which
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.endif
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# AUTOCONF := ${autoconf:L:${M_whence}}
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M_type = @x@(${_type_sh:Utype} $$x) 2> /dev/null; echo;@:sh:[0]:N* found*:[@]:C,[()],,g
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M_whence = ${M_type}:M/*:[1]
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# convert a path to a valid shell variable
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M_P2V = tu:C,[./-],_,g
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# convert path to absolute
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.if ${MAKE_VERSION:U0} > 20100408
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M_tA = tA
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.else
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M_tA = C,.*,('cd' & \&\& 'pwd') 2> /dev/null || echo &,:sh
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.endif
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.if ${MAKE_VERSION:U0} >= 20170130
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# M_cmpv allows comparing dotted versions like 3.1.2
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# ${3.1.2:L:${M_cmpv}} -> 3001002
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# we use big jumps to handle 3 digits per dot:
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# ${123.456.789:L:${M_cmpv}} -> 123456789
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M_cmpv.units = 1 1000 1000000
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M_cmpv = S,., ,g:_:range:@i@+ $${_:[-$$i]} \* $${M_cmpv.units:[$$i]}@:S,^,expr 0 ,1:sh
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.endif
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# absoulte path to what we are reading.
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_PARSEDIR = ${.PARSEDIR:${M_tA}}
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