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varname-dot-make-save_dollars.mk revision 1.3 
      1  1.3  rillig # $NetBSD: varname-dot-make-save_dollars.mk,v 1.3 2021/11/30 23:52:19 rillig Exp $
      2  1.1  rillig #
      3  1.3  rillig # Tests for the special .MAKE.SAVE_DOLLARS variable, which controls whether
      4  1.3  rillig # the assignment operator ':=' converts '$$' to a single '$' or keeps it
      5  1.3  rillig # as-is.
      6  1.3  rillig #
      7  1.3  rillig # See also:
      8  1.3  rillig #	var-op-expand.mk
      9  1.3  rillig #	varmisc.mk		for the boolean values
     10  1.3  rillig 
     11  1.3  rillig # Initially, the variable .MAKE.SAVE_DOLLARS is undefined. At this point the
     12  1.3  rillig # behavior of the assignment operator ':=' depends.  NetBSD's usr.bin/make
     13  1.3  rillig # preserves the '$$' as-is, while the bmake distribution replaces '$$' with
     14  1.3  rillig # '$'.
     15  1.3  rillig .if ${.MAKE.SAVE_DOLLARS:Uundefined} != "undefined"
     16  1.3  rillig .  error
     17  1.3  rillig .endif
     18  1.3  rillig 
     19  1.3  rillig 
     20  1.3  rillig # Even when dollars are preserved, it only applies to literal dollars, not
     21  1.3  rillig # those that come indirectly from other expressions.
     22  1.3  rillig .MAKE.SAVE_DOLLARS=	yes
     23  1.3  rillig DOLLARS=		$$$$$$$$
     24  1.3  rillig VAR:=			${DOLLARS}
     25  1.3  rillig # The reduction from 8 '$' to 4 '$' happens when ${VAR} is evaluated in the
     26  1.3  rillig # condition; .MAKE.SAVE_DOLLARS only applies to the operator ':='.
     27  1.3  rillig .if ${VAR} != "\$\$\$\$"
     28  1.3  rillig .  error
     29  1.3  rillig .endif
     30  1.3  rillig 
     31  1.3  rillig # Dollars from the literal value are preserved now.
     32  1.3  rillig .MAKE.SAVE_DOLLARS=	yes
     33  1.3  rillig VAR:=			$$$$$$$$
     34  1.3  rillig .if ${VAR} != "\$\$\$\$"
     35  1.3  rillig .  error
     36  1.3  rillig .endif
     37  1.3  rillig 
     38  1.3  rillig .MAKE.SAVE_DOLLARS=	no
     39  1.3  rillig VAR:=			$$$$$$$$
     40  1.3  rillig .if ${VAR} != "\$\$"
     41  1.3  rillig .  error
     42  1.3  rillig .endif
     43  1.3  rillig 
     44  1.3  rillig # It's even possible to change the dollar interpretation in the middle of
     45  1.3  rillig # evaluating an expression, even though there is no practical need for it.
     46  1.3  rillig .MAKE.SAVE_DOLLARS=	no
     47  1.3  rillig VAR:=		$$$$-${.MAKE.SAVE_DOLLARS::=yes}-$$$$
     48  1.3  rillig .if ${VAR} != "\$--\$\$"
     49  1.3  rillig .  error
     50  1.3  rillig .endif
     51  1.1  rillig 
     52  1.3  rillig # The '$' from the ':U' expressions are indirect, therefore SAVE_DOLLARS
     53  1.3  rillig # doesn't apply to them.
     54  1.3  rillig VAR:=		${:U\$\$\$\$}-${.MAKE.SAVE_DOLLARS::=yes}-${:U\$\$\$\$}
     55  1.3  rillig .if ${VAR} != "\$\$--\$\$"
     56  1.3  rillig .  error
     57  1.3  rillig .endif
     58  1.1  rillig 
     59  1.1  rillig all:
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