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varname-dot-make-save_dollars.mk revision 1.5 
      1 # $NetBSD: varname-dot-make-save_dollars.mk,v 1.5 2021/12/01 23:15:38 rillig Exp $
      2 #
      3 # Tests for the special .MAKE.SAVE_DOLLARS variable, which controls whether
      4 # the assignment operator ':=' converts '$$' to a single '$' or keeps it
      5 # as-is.
      6 #
      7 # See also:
      8 #	var-op-expand.mk	for ':=' in general
      9 #	varmisc.mk		for parsing the boolean values
     10 
     11 # Initially, the variable .MAKE.SAVE_DOLLARS is undefined. At this point the
     12 # behavior of the assignment operator ':=' depends.  NetBSD's usr.bin/make
     13 # preserves the '$$' as-is, while the bmake distribution replaces '$$' with
     14 # '$'.
     15 .if ${.MAKE.SAVE_DOLLARS:Uundefined} != "undefined"
     16 .  error
     17 .endif
     18 
     19 
     20 # Even when dollars are preserved, it only applies to literal dollars, not
     21 # to those that come indirectly from other expressions.
     22 DOLLARS=		$$$$$$$$
     23 .MAKE.SAVE_DOLLARS=	yes
     24 VAR:=			${DOLLARS}
     25 # The reduction from 8 '$' to 4 '$' happens when ${VAR} is evaluated in the
     26 # condition; .MAKE.SAVE_DOLLARS only applies at the moment where the
     27 # assignment is performed using ':='.
     28 .if ${VAR} != "\$\$\$\$"
     29 .  error
     30 .endif
     31 
     32 # The 'yes' preserves the dollars from the literal.
     33 .MAKE.SAVE_DOLLARS=	yes
     34 VAR:=			$$$$$$$$
     35 .if ${VAR} != "\$\$\$\$"
     36 .  error
     37 .endif
     38 
     39 # The 'no' converts each '$$' to '$'.
     40 .MAKE.SAVE_DOLLARS=	no
     41 VAR:=			$$$$$$$$
     42 .if ${VAR} != "\$\$"
     43 .  error
     44 .endif
     45 
     46 # It's even possible to change the dollar interpretation in the middle of
     47 # evaluating an expression, but there is no practical need for it.
     48 .MAKE.SAVE_DOLLARS=	no
     49 VAR:=		$$$$-${.MAKE.SAVE_DOLLARS::=yes}-$$$$
     50 .if ${VAR} != "\$--\$\$"
     51 .  error
     52 .endif
     53 
     54 # The '$' from the ':U' expressions are indirect, therefore .MAKE.SAVE_DOLLARS
     55 # doesn't apply to them.
     56 .MAKE.SAVE_DOLLARS=	no
     57 VAR:=		${:U\$\$\$\$}-${.MAKE.SAVE_DOLLARS::=yes}-${:U\$\$\$\$}
     58 .if ${VAR} != "\$\$--\$\$"
     59 .  error
     60 .endif
     61 
     62 # Undefining .MAKE.SAVE_DOLLARS does not have any effect, in particular it
     63 # does not restore the default behavior.
     64 .MAKE.SAVE_DOLLARS=	no
     65 .undef .MAKE.SAVE_DOLLARS
     66 VAR:=		$$$$$$$$
     67 .if ${VAR} != "\$\$"
     68 .  error
     69 .endif
     70 
     71 # Undefining .MAKE.SAVE_DOLLARS does not have any effect, in particular it
     72 # does not restore the default behavior.
     73 .MAKE.SAVE_DOLLARS=	yes
     74 .undef .MAKE.SAVE_DOLLARS
     75 VAR:=		$$$$$$$$
     76 .if ${VAR} != "\$\$\$\$"
     77 .  error
     78 .endif
     79 
     80 all:
     81