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varname-dot-make-save_dollars.mk revision 1.5 
      1  1.5  rillig # $NetBSD: varname-dot-make-save_dollars.mk,v 1.5 2021/12/01 23:15:38 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 '$$' to a single '$' or keeps it
      5  1.3  rillig # as-is.
      6  1.3  rillig #
      7  1.3  rillig # See also:
      8  1.5  rillig #	var-op-expand.mk	for ':=' in general
      9  1.5  rillig #	varmisc.mk		for parsing the boolean values
     10  1.3  rillig 
     11  1.3  rillig # Initially, the variable .MAKE.SAVE_DOLLARS is undefined. At this point the
     12  1.3  rillig # behavior of the assignment operator ':=' depends.  NetBSD's usr.bin/make
     13  1.3  rillig # preserves the '$$' as-is, while the bmake distribution replaces '$$' with
     14  1.3  rillig # '$'.
     15  1.3  rillig .if ${.MAKE.SAVE_DOLLARS:Uundefined} != "undefined"
     16  1.3  rillig .  error
     17  1.3  rillig .endif
     18  1.3  rillig 
     19  1.3  rillig 
     20  1.3  rillig # Even when dollars are preserved, it only applies to literal dollars, not
     21  1.5  rillig # to those that come indirectly from other expressions.
     22  1.5  rillig DOLLARS=		$$$$$$$$
     23  1.3  rillig .MAKE.SAVE_DOLLARS=	yes
     24  1.3  rillig VAR:=			${DOLLARS}
     25  1.3  rillig # The reduction from 8 '$' to 4 '$' happens when ${VAR} is evaluated in the
     26  1.5  rillig # condition; .MAKE.SAVE_DOLLARS only applies at the moment where the
     27  1.5  rillig # assignment is performed using ':='.
     28  1.3  rillig .if ${VAR} != "\$\$\$\$"
     29  1.3  rillig .  error
     30  1.3  rillig .endif
     31  1.3  rillig 
     32  1.5  rillig # The 'yes' preserves the dollars from the literal.
     33  1.3  rillig .MAKE.SAVE_DOLLARS=	yes
     34  1.3  rillig VAR:=			$$$$$$$$
     35  1.3  rillig .if ${VAR} != "\$\$\$\$"
     36  1.3  rillig .  error
     37  1.3  rillig .endif
     38  1.3  rillig 
     39  1.5  rillig # The 'no' converts each '$$' to '$'.
     40  1.3  rillig .MAKE.SAVE_DOLLARS=	no
     41  1.3  rillig VAR:=			$$$$$$$$
     42  1.3  rillig .if ${VAR} != "\$\$"
     43  1.3  rillig .  error
     44  1.3  rillig .endif
     45  1.3  rillig 
     46  1.3  rillig # It's even possible to change the dollar interpretation in the middle of
     47  1.5  rillig # evaluating an expression, but there is no practical need for it.
     48  1.3  rillig .MAKE.SAVE_DOLLARS=	no
     49  1.3  rillig VAR:=		$$$$-${.MAKE.SAVE_DOLLARS::=yes}-$$$$
     50  1.3  rillig .if ${VAR} != "\$--\$\$"
     51  1.3  rillig .  error
     52  1.3  rillig .endif
     53  1.1  rillig 
     54  1.5  rillig # The '$' from the ':U' expressions are indirect, therefore .MAKE.SAVE_DOLLARS
     55  1.3  rillig # doesn't apply to them.
     56  1.4  rillig .MAKE.SAVE_DOLLARS=	no
     57  1.3  rillig VAR:=		${:U\$\$\$\$}-${.MAKE.SAVE_DOLLARS::=yes}-${:U\$\$\$\$}
     58  1.3  rillig .if ${VAR} != "\$\$--\$\$"
     59  1.3  rillig .  error
     60  1.3  rillig .endif
     61  1.1  rillig 
     62  1.4  rillig # Undefining .MAKE.SAVE_DOLLARS does not have any effect, in particular it
     63  1.4  rillig # does not restore the default behavior.
     64  1.4  rillig .MAKE.SAVE_DOLLARS=	no
     65  1.4  rillig .undef .MAKE.SAVE_DOLLARS
     66  1.4  rillig VAR:=		$$$$$$$$
     67  1.4  rillig .if ${VAR} != "\$\$"
     68  1.4  rillig .  error
     69  1.4  rillig .endif
     70  1.4  rillig 
     71  1.4  rillig # Undefining .MAKE.SAVE_DOLLARS does not have any effect, in particular it
     72  1.4  rillig # does not restore the default behavior.
     73  1.4  rillig .MAKE.SAVE_DOLLARS=	yes
     74  1.4  rillig .undef .MAKE.SAVE_DOLLARS
     75  1.4  rillig VAR:=		$$$$$$$$
     76  1.4  rillig .if ${VAR} != "\$\$\$\$"
     77  1.4  rillig .  error
     78  1.4  rillig .endif
     79  1.4  rillig 
     80  1.1  rillig all:
     81