101 lines
2.5 KiB
Makefile
101 lines
2.5 KiB
Makefile
# $NetBSD: directive-if.mk,v 1.11 2022/01/23 21:48:59 rillig Exp $
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#
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# Tests for the .if directive.
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#
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# See also:
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# cond-*.mk
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# TODO: Implementation
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.if 0
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. error
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.else
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. info 0 evaluates to false.
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.endif
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.if 1
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. info 1 evaluates to true.
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.else
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. error
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.endif
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# There is no '.ifx'.
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#
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# The commit from 2005-05-01 intended to detect this situation, but it failed
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# to do this since the call to is_token had its arguments switched. They were
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# expected as (str, token, token_len) but were actually passed as (token, str,
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# token_len). This made is_token return true even if the directive was
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# directly followed by alphanumerical characters, which was wrong. The
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# typical cases produced an error message such as "Malformed conditional
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# (x 123)", while the intended error message was "Unknown directive".
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#
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# Back at that time, the commits only modified the main code but did not add
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# the corresponding unit tests. This allowed the bug to hide for more than
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# 15 years.
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#
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# Since 2020-11-10, the correct error message is produced. The '.ifx' is no
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# longer interpreted as a variant of '.if', therefore the '.error' and '.else'
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# are interpreted as ordinary directives, producing the error messages
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# "if-less else" and "if-less endif".
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# expect+1: Unknown directive "ifx"
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.ifx 123
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# expect+1: This is not conditional.
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.info This is not conditional.
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# expect+1: if-less else
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.else
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# expect+1: This is not conditional.
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.info This is not conditional.
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# expect+1: if-less endif
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.endif
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# Missing condition.
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# expect+1: Malformed conditional ()
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.if
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. error
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.else
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. error
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.endif
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# A plain word must not start with a '"'. It may contain a embedded quotes
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# though, which are kept. The quotes need not be balanced. The next space
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# ends the word, and the remaining " || 1" is parsed as "or true".
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.if ${:Uplain"""""} == plain""""" || 1
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. info Quotes in plain words are probably a mistake.
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# XXX: Accepting quotes in plain words is probably a mistake as well.
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.else
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. error
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.endif
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.if0
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. error
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.else
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. info Don't do this, always put a space after a directive.
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.endif
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.if${:U-3}
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. info Don't do this, always put a space after a directive.
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.else
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. error
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.endif
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.if${:U-3}>-4
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. info Don't do this, always put a space around comparison operators.
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.else
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. error
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.endif
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.if(1)
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. info Don't do this, always put a space after a directive.
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.endif
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.if!0
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. info Don't do this, always put a space after a directive.
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.endif
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# The directives '.ifdef' and '.ifmake' can be negated by inserting an 'n'.
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# This doesn't work for a plain '.if' though.
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#
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# expect+1: Unknown directive "ifn"
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.ifn 0
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