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modmisc.mk revision 1.48 
      1 # $NetBSD: modmisc.mk,v 1.48 2020/10/24 08:46:08 rillig Exp $
      2 #
      3 # miscellaneous modifier tests
      4 
      5 # do not put any dirs in this list which exist on some
      6 # but not all target systems - an exists() check is below.
      7 path=:/bin:/tmp::/:.:/no/such/dir:.
      8 # strip cwd from path.
      9 MOD_NODOT=S/:/ /g:N.:ts:
     10 # and decorate, note that $'s need to be doubled. Also note that 
     11 # the modifier_variable can be used with other modifiers.
     12 MOD_NODOTX=S/:/ /g:N.:@d@'$$d'@
     13 # another mod - pretend it is more interesting
     14 MOD_HOMES=S,/home/,/homes/,
     15 MOD_OPT=@d@$${exists($$d):?$$d:$${d:S,/usr,/opt,}}@
     16 MOD_SEP=S,:, ,g
     17 
     18 all:	modvar modvarloop modsysv emptyvar undefvar
     19 all:	mod-quote
     20 all:	mod-break-many-words
     21 
     22 # See also sysv.mk.
     23 modsysv:
     24 	@echo "The answer is ${libfoo.a:L:libfoo.a=42}"
     25 
     26 # Demonstrates modifiers that are given indirectly from a variable.
     27 modvar:
     28 	@echo "path='${path}'"
     29 	@echo "path='${path:${MOD_NODOT}}'"
     30 	@echo "path='${path:S,home,homes,:${MOD_NODOT}}'"
     31 	@echo "path=${path:${MOD_NODOTX}:ts:}"
     32 	@echo "path=${path:${MOD_HOMES}:${MOD_NODOTX}:ts:}"
     33 
     34 .for d in ${path:${MOD_SEP}:N.} /usr/xbin
     35 path_$d?= ${d:${MOD_OPT}:${MOD_HOMES}}/
     36 paths+= ${d:${MOD_OPT}:${MOD_HOMES}}
     37 .endfor
     38 
     39 modvarloop:
     40 	@echo "path_/usr/xbin=${path_/usr/xbin}"
     41 	@echo "paths=${paths}"
     42 	@echo "PATHS=${paths:tu}"
     43 
     44 # When a modifier is applied to the "" variable, the result is discarded.
     45 emptyvar:
     46 	@echo S:${:S,^$,empty,}
     47 	@echo C:${:C,^$,empty,}
     48 	@echo @:${:@var@${var}@}
     49 
     50 # The :U modifier turns even the "" variable into something that has a value.
     51 # The resulting variable is empty, but is still considered to contain a
     52 # single empty word. This word can be accessed by the :S and :C modifiers,
     53 # but not by the :@ modifier since it explicitly skips empty words.
     54 undefvar:
     55 	@echo S:${:U:S,^$,empty,}
     56 	@echo C:${:U:C,^$,empty,}
     57 	@echo @:${:U:@var@empty@}
     58 
     59 
     60 mod-quote:
     61 	@echo $@: new${.newline:Q}${.newline:Q}line
     62 
     63 # Cover the bmake_realloc in brk_string.
     64 mod-break-many-words:
     65 	@echo $@: ${UNDEF:U:range=500:[#]}
     66 
     67 # To apply a modifier indirectly via another variable, the whole
     68 # modifier must be put into a single variable.
     69 .if ${value:L:${:US}${:U,value,replacement,}} != "S,value,replacement,}"
     70 .  warning unexpected
     71 .endif
     72 
     73 # Adding another level of indirection (the 2 nested :U expressions) helps.
     74 .if ${value:L:${:U${:US}${:U,value,replacement,}}} != "replacement"
     75 .  warning unexpected
     76 .endif
     77 
     78 # Multiple indirect modifiers can be applied one after another as long as
     79 # they are separated with colons.
     80 .if ${value:L:${:US,a,A,}:${:US,e,E,}} != "vAluE"
     81 .  warning unexpected
     82 .endif
     83 
     84 # An indirect variable that evaluates to the empty string is allowed though.
     85 # This makes it possible to define conditional modifiers, like this:
     86 #
     87 # M.little-endian=	S,1234,4321,
     88 # M.big-endian=		# none
     89 .if ${value:L:${:Dempty}S,a,A,} != "vAlue"
     90 .  warning unexpected
     91 .endif
     92 
     93