64 lines
2.0 KiB
Makefile
64 lines
2.0 KiB
Makefile
# $NetBSD: cond-op-parentheses.mk,v 1.6 2022/09/04 22:55:00 rillig Exp $
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#
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# Tests for parentheses in .if conditions, which group expressions to override
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# the precedence of the operators '!', '&&' and '||'. Parentheses cannot be
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# used to form arithmetic expressions such as '(3+4)' though.
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# Contrary to the C family of programming languages, the outermost condition
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# does not have to be enclosed in parentheses.
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.if defined(VAR)
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. error
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.elif !1
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. error
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.endif
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# Parentheses cannot enclose numbers as there is no need for it. Make does
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# not implement any arithmetic functions in its condition parser. If
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# absolutely necessary, use expr(1).
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#
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# XXX: It's inconsistent that the right operand has unbalanced parentheses.
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#
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# expect+1: Comparison with '>' requires both operands '3' and '(2' to be numeric
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.if 3 > (2)
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.endif
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# expect+1: Malformed conditional ((3) > 2)
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.if (3) > 2
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.endif
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# Test for deeply nested conditions.
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.if (((((((((((((((((((((((((((((((((((((((((((((((((((((((( \
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(((((((((((((((((((((((((((((((((((((((((((((((((((((((( \
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1 \
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)))))))))))))))))))))))))))))))))))))))))))))))))))))))) \
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))))))))))))))))))))))))))))))))))))))))))))))))))))))))
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# Parentheses can be nested at least to depth 112. There is nothing special
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# about this number though, much higher numbers work as well, at least on
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# NetBSD. The actual limit depends on the allowed call stack depth for C code
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# of the platform. Anyway, 112 should be enough for all practical purposes.
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.else
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. error
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.endif
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# An unbalanced opening parenthesis is a parse error.
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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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# An unbalanced closing parenthesis is a parse error.
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#
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# Before cond.c 1.237 from 2021-01-19, CondParser_Term returned TOK_RPAREN
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# even though the documentation of that function promised to only ever return
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# TOK_TRUE, TOK_FALSE or TOK_ERROR. In cond.c 1.241, the return type of that
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# function was changed to a properly restricted enum type, to prevent this bug
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# from occurring again.
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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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all:
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@:;
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