52 lines
1.2 KiB
Makefile
52 lines
1.2 KiB
Makefile
# $NetBSD: cond-func-exists.mk,v 1.7 2023/11/19 21:47:52 rillig Exp $
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#
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# Tests for the exists() function in .if conditions.
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.if !exists(.)
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. error
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.endif
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# The argument to the function must not be enclosed in quotes.
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# Neither double quotes nor single quotes are allowed.
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.if exists(".")
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. error
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.endif
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.if exists('.')
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. error
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.endif
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# The only way to escape characters that would otherwise influence the parser
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# is to enclose them in an expression. For function arguments,
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# neither the backslash nor the dollar sign act as escape character.
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.if exists(\.)
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. error
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.endif
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.if !exists(${:U.})
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. error
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.endif
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# The argument to the function can have several expressions.
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# See cond-func.mk for the characters that cannot be used directly.
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.if !exists(${.PARSEDIR}/${.PARSEFILE})
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. error
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.endif
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# Whitespace is trimmed on both sides of the function argument.
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.if !exists( . )
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. error
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.endif
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# The exists function does not really look up the file in the file system,
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# instead it uses a cache that is preloaded very early, before parsing the
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# first makefile. At that time, the file did not exist yet.
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_!= > cond-func-exists.just-created
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.if exists(cond-func-exists.just-created)
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. error
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.endif
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_!= rm cond-func-exists.just-created
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all:
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@:;
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