ab975bef9f
Previously, the error message was "Unknown directive", which was obviously wrong. The new error message is "Missing argument".
61 lines
1.6 KiB
Makefile
61 lines
1.6 KiB
Makefile
# $NetBSD: varmod.mk,v 1.5 2020/12/19 22:33:11 rillig Exp $
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#
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# Tests for variable modifiers, such as :Q, :S,from,to or :Ufallback.
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DOLLAR1= $$
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DOLLAR2= ${:U\$}
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# To get a single '$' sign in the value of a variable expression, it has to
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# be written as '$$' in a literal variable value.
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#
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# See Var_Parse, where it calls Var_Subst.
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.if ${DOLLAR1} != "\$"
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. error
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.endif
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# Another way to get a single '$' sign is to use the :U modifier. In the
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# argument of that modifier, a '$' is escaped using the backslash instead.
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#
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# See Var_Parse, where it calls Var_Subst.
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.if ${DOLLAR2} != "\$"
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. error
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.endif
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# It is also possible to use the :U modifier directly in the expression.
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#
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# See Var_Parse, where it calls Var_Subst.
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.if ${:U\$} != "\$"
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. error
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.endif
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# XXX: As of 2020-09-13, it is not possible to use '$$' in a variable name
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# to mean a single '$'. This contradicts the manual page, which says that
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# '$' can be escaped as '$$'.
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.if ${$$:L} != ""
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. error
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.endif
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# In lint mode, make prints helpful error messages.
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# For compatibility, make does not print these error messages in normal mode.
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# Should it?
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.MAKEFLAGS: -dL
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.if ${$$:L} != ""
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. error
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.endif
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# A '$' followed by nothing is an error as well.
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.if ${:Uword:@word@${word}$@} != "word"
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. error
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.endif
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# The variable modifier :P does not fall back to the SysV modifier.
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# Therefore the modifier :P=RE generates a parse error.
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# XXX: The .error should not be reached since the variable expression is
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# malformed, and this error should be propagated up to Cond_EvalLine.
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VAR= STOP
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.if ${VAR:P=RE} != "STORE"
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. error
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.endif
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all: # nothing
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