2021-12-18 07:27:22 +00:00
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# $NetBSD: varname-dot-make-save_dollars.mk,v 1.7 2021/12/03 18:43:52 rillig Exp $
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2020-09-05 16:11:04 +00:00
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#
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2021-12-18 07:27:22 +00:00
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# Tests for the special .MAKE.SAVE_DOLLARS variable, which controls whether
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# the assignment operator ':=' converts '$$' to a single '$' or keeps it
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# as-is.
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#
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# See also:
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# var-op-expand.mk for ':=' in general
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# varmisc.mk for parsing the boolean values
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# Initially, the variable .MAKE.SAVE_DOLLARS is undefined. At this point the
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# behavior of the assignment operator ':=' depends. NetBSD's usr.bin/make
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# preserves the '$$' as-is, while the bmake distribution replaces '$$' with
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# '$'.
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.if ${.MAKE.SAVE_DOLLARS:Uundefined} != "undefined"
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. error
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.endif
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# When dollars are preserved, this setting not only applies to literal
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# dollars, but also to those that come indirectly from other expressions.
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DOLLARS= $$$$$$$$
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.MAKE.SAVE_DOLLARS= yes
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VAR:= ${DOLLARS}
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# The reduction from 8 '$' to 4 '$' happens when ${VAR} is evaluated in the
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# condition; .MAKE.SAVE_DOLLARS only applies at the moment where the
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# assignment is performed using ':='.
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.if ${VAR} != "\$\$\$\$"
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. error
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.endif
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# When dollars are preserved, this setting not only applies to literal
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# dollars, but also to those that come indirectly from other expressions.
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DOLLARS= $$$$$$$$
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.MAKE.SAVE_DOLLARS= no
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VAR:= ${DOLLARS}
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.if ${VAR} != "\$\$"
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. error
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.endif
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# The 'yes' preserves the dollars from the literal.
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.MAKE.SAVE_DOLLARS= yes
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VAR:= $$$$$$$$
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.if ${VAR} != "\$\$\$\$"
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. error
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.endif
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# The 'no' converts each '$$' to '$'.
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.MAKE.SAVE_DOLLARS= no
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VAR:= $$$$$$$$
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.if ${VAR} != "\$\$"
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. error
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.endif
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# It's even possible to change the dollar interpretation in the middle of
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# evaluating an expression, but there is no practical need for it.
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.MAKE.SAVE_DOLLARS= no
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VAR:= $$$$-${.MAKE.SAVE_DOLLARS::=yes}-$$$$
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.if ${VAR} != "\$--\$\$"
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. error
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.endif
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# The '$' from the ':U' expressions do not appear as literal '$$' to the
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# parser (no matter whether directly or indirectly), they only appear as '$$'
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# in the value of an expression, therefore .MAKE.SAVE_DOLLARS doesn't apply
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# here.
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.MAKE.SAVE_DOLLARS= no
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VAR:= ${:U\$\$\$\$}-${.MAKE.SAVE_DOLLARS::=yes}-${:U\$\$\$\$}
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.if ${VAR} != "\$\$--\$\$"
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. error
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.endif
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# Undefining .MAKE.SAVE_DOLLARS does not have any effect, in particular it
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# does not restore the default behavior.
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.MAKE.SAVE_DOLLARS= no
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.undef .MAKE.SAVE_DOLLARS
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VAR:= $$$$$$$$
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.if ${VAR} != "\$\$"
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. error
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.endif
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# Undefining .MAKE.SAVE_DOLLARS does not have any effect, in particular it
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# does not restore the default behavior.
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.MAKE.SAVE_DOLLARS= yes
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.undef .MAKE.SAVE_DOLLARS
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VAR:= $$$$$$$$
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.if ${VAR} != "\$\$\$\$"
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. error
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.endif
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# The variable '.MAKE.SAVE_DOLLARS' not only affects literal '$$' on the
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# right-hand side of the assignment operator ':=', it also affects dollars
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# in indirect expressions.
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#
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# In this example, it affects the command in CMD itself, not the result of
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# running that command.
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.MAKE.SAVE_DOLLARS= no
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CMD= echo '$$$$$$$$'
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VAR:= ${CMD:sh}
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.if ${VAR} != "\$\$"
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. error
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.endif
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.MAKE.SAVE_DOLLARS= yes
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CMD= echo '$$$$$$$$'
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VAR:= ${CMD:sh}
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.if ${VAR} != "\$\$\$\$"
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. error
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.endif
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# In the modifier ':@var@body@', .MAKE.SAVE_DOLLARS does not affect the body.
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# In both cases, each '$$' is replaced with a single '$', no matter whether
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# directly or indirectly via another expression.
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.MAKE.SAVE_DOLLARS= no
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DOLLARS= $$$$$$$$
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VAR:= ${word:L:@word@$$$$$$$$-${DOLLARS}@}
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.if ${VAR} != "\$\$-\$\$"
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. error
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.endif
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.MAKE.SAVE_DOLLARS= yes
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DOLLARS= $$$$$$$$
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VAR:= ${word:L:@word@$$$$$$$$-${DOLLARS}@}
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.if ${VAR} != "\$\$-\$\$"
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. error
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.endif
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2020-09-05 16:11:04 +00:00
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all:
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