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var-scope-local.mk revision 1.2 
      1 # $NetBSD: var-scope-local.mk,v 1.2 2022/01/27 06:56:27 sjg Exp $
      2 #
      3 # Tests for target-local variables, such as ${.TARGET} or $@.
      4 
      5 # TODO: Implementation
      6 
      7 # Ensure that the name of the variable is exactly the given one.
      8 # The variable "@" is an alias for ".TARGET", so the implementation might
      9 # canonicalize these aliases at some point, and that might be surprising.
     10 # This aliasing happens for single-character variable names like $@ or $<
     11 # (see VarFind, CanonicalVarname), but not for braced or parenthesized
     12 # expressions like ${@}, ${.TARGET} ${VAR:Mpattern} (see Var_Parse,
     13 # ParseVarname).
     14 .if ${@:L} != "@"
     15 .  error
     16 .endif
     17 .if ${.TARGET:L} != ".TARGET"
     18 .  error
     19 .endif
     20 .if ${@F:L} != "@F"
     21 .  error
     22 .endif
     23 .if ${@D:L} != "@D"
     24 .  error
     25 .endif
     26 
     27 all:
     28 
     29 .SUFFIXES: .c .o
     30 
     31 var-scope-local.c var-scope-local2.c var-scope-local3.c:
     32 	: Making ${.TARGET} out of nothing.
     33 
     34 .c.o:
     35 	: Making ${.TARGET} from ${.IMPSRC}.
     36 
     37 	# The local variables @F, @D, <F, <D are legacy forms.
     38 	# See the manual page for details.
     39 	: Making basename "${@F}" in "${@D}" from "${<F}" in "${<D}" VAR="${VAR}".
     40 
     41 all: var-scope-local.o var-scope-local2.o var-scope-local3.o
     42 	# The ::= modifier overwrites the .TARGET variable in the node
     43 	# 'all', not in the global scope.  This can be seen with the -dv
     44 	# option, looking for "all:@ = overwritten".
     45 	: ${.TARGET} ${.TARGET::=overwritten}${.TARGET} VAR="${VAR}"
     46 
     47 # we can set variables per target with some limitations
     48 .MAKE.TARGET_LOCAL_VARIABLES= yes
     49 VAR= global
     50 # the rest of the line is the value
     51 var-scope-local.o: VAR= local
     52 # += will *not* take global value and add to it in local context
     53 var-scope-local2.o: VAR+= local
     54 # but once defined in local context += behaves as expected.
     55 var-scope-local2.o: VAR += to ${.TARGET}
     56 # we can get the global value though
     57 # so complex values can always be set via global variable and then
     58 # assigned to local context
     59 # Note: that the global ${VAR} is expanded at this point
     60 # just as with any dependency line.
     61 var-scope-local3.o: VAR= ${VAR}+local
     62 
     63 # while VAR=use will be set for a .USE node, it will never be seen
     64 # since only the ultimate target's context is searched
     65 a_use: .USE VAR=use
     66 	: ${.TARGET} uses .USE VAR="${VAR}"
     67 
     68 var-scope-local3.o: a_use
     69