169 lines
4.2 KiB
Makefile
169 lines
4.2 KiB
Makefile
# $NetBSD: var-eval-short.mk,v 1.8 2021/12/27 18:54:19 rillig Exp $
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#
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# Tests for each variable modifier to ensure that they only do the minimum
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# necessary computations. If the result of the expression is irrelevant,
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# the modifier should only be parsed. The modifier should not be evaluated,
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# but if it is evaluated for simplicity of the code (such as ':ts'), it must
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# not have any observable side effects.
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#
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# See also:
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# var.c, the comment starting with 'The ApplyModifier functions'
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# ParseModifierPart, for evaluating nested expressions
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# cond-short.mk
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FAIL= ${:!echo unexpected 1>&2!}
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# The following tests only ensure that nested expressions are not evaluated.
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# They cannot ensure that any unexpanded text returned from ParseModifierPart
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# is ignored as well. To do that, it is necessary to step through the code of
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# each modifier.
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# TODO: Test the modifiers in the same order as they appear in ApplyModifier.
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.if 0 && ${FAIL}
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.endif
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.if 0 && ${VAR::=${FAIL}}
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.elif defined(VAR)
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. error
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.endif
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.if 0 && ${${FAIL}:?then:else}
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.endif
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.if 0 && ${1:?${FAIL}:${FAIL}}
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.endif
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.if 0 && ${0:?${FAIL}:${FAIL}}
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.endif
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# Before var.c 1.870 from 2021-03-14, the expression ${FAIL} was evaluated
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# after the loop, when undefining the temporary global loop variable.
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# Since var.c 1.907 from 2021-04-04, a '$' is no longer allowed in the
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# variable name.
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.if 0 && ${:Uword:@${FAIL}@expr@}
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.endif
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.if 0 && ${:Uword:@var@${FAIL}@}
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.endif
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# Before var.c 1.877 from 2021-03-14, the modifier ':[...]' did not expand
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# the nested expression ${FAIL} and then tried to parse the unexpanded text,
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# which failed since '$' is not a valid range character.
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.if 0 && ${:Uword:[${FAIL}]}
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.endif
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# Before var.c 1.867 from 2021-03-14, the modifier ':_' defined the variable
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# even though the whole expression should have only been parsed, not
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# evaluated.
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.if 0 && ${:Uword:_=VAR}
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.elif defined(VAR)
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. error
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.endif
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# Before var.c 1.856 from 2021-03-14, the modifier ':C' did not expand the
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# nested expression ${FAIL}, which is correct, and then tried to compile the
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# unexpanded text as a regular expression, which is unnecessary since the
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# right-hand side of the '&&' cannot influence the outcome of the condition.
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# Compiling the regular expression then failed both because of the '{FAIL}',
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# which is not a valid repetition of the form '{1,5}', and because of the
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# '****', which are repeated repetitions as well.
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# '${FAIL}'
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.if 0 && ${:Uword:C,${FAIL}****,,}
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.endif
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DEFINED= # defined
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.if 0 && ${DEFINED:D${FAIL}}
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.endif
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.if 0 && ${:Uword:E}
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.endif
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# As of 2021-03-14, the error 'Invalid time value: ${FAIL}}' is ok since
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# ':gmtime' does not expand its argument.
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.if 0 && ${:Uword:gmtime=${FAIL}}
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.endif
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.if 0 && ${:Uword:H}
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.endif
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.if 0 && ${:Uword:hash}
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.endif
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.if 0 && ${value:L}
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.endif
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# As of 2021-03-14, the error 'Invalid time value: ${FAIL}}' is ok since
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# ':localtime' does not expand its argument.
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.if 0 && ${:Uword:localtime=${FAIL}}
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.endif
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.if 0 && ${:Uword:M${FAIL}}
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.endif
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.if 0 && ${:Uword:N${FAIL}}
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.endif
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.if 0 && ${:Uword:O}
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.endif
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.if 0 && ${:Uword:Ox}
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.endif
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.if 0 && ${:Uword:P}
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.endif
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.if 0 && ${:Uword:Q}
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.endif
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.if 0 && ${:Uword:q}
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.endif
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.if 0 && ${:Uword:R}
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.endif
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.if 0 && ${:Uword:range}
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.endif
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.if 0 && ${:Uword:S,${FAIL},${FAIL},}
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.endif
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.if 0 && ${:Uword:sh}
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.endif
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.if 0 && ${:Uword:T}
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.endif
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.if 0 && ${:Uword:ts/}
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.endif
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.if 0 && ${:U${FAIL}}
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.endif
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.if 0 && ${:Uword:u}
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.endif
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.if 0 && ${:Uword:word=replacement}
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.endif
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# Before var.c 1.875 from 2021-03-14, Var_Parse returned "${FAIL}else" for the
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# irrelevant right-hand side of the condition, even though this was not
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# necessary. Since the return value from Var_Parse is supposed to be ignored
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# anyway, and since it is actually ignored in an overly complicated way,
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# an empty string suffices.
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.MAKEFLAGS: -dcpv
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.if 0 && ${0:?${FAIL}then:${FAIL}else}
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.endif
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# The ':L' is applied before the ':?' modifier, giving the expression a name
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# and a value, just to see whether this value gets passed through or whether
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# the parse-only mode results in an empty string (only visible in the debug
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# log). As of var.c 1.875 from 2021-03-14, the value of the variable gets
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# through, even though an empty string would suffice.
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DEFINED= defined
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.if 0 && ${DEFINED:L:?${FAIL}then:${FAIL}else}
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.endif
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.MAKEFLAGS: -d0
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all:
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