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# $NetBSD: cond-op-parentheses.mk,v 1.7 2023/06/01 20:56:35 rillig Exp $
#
# Tests for parentheses in .if conditions, which group expressions to override
# the precedence of the operators '!', '&&' and '||'. Parentheses cannot be
# used to form arithmetic expressions such as '(3+4)' though.
# Contrary to the C family of programming languages, the outermost condition
# does not have to be enclosed in parentheses.
.if defined(VAR)
. error
.elif !1
. error
.endif
# Parentheses cannot enclose numbers as there is no need for it. Make does
# not implement any arithmetic functions in its condition parser. If
# absolutely necessary, use expr(1).
#
# XXX: It's inconsistent that the right operand has unbalanced parentheses.
#
# expect+1: Comparison with '>' requires both operands '3' and '(2' to be numeric
.if 3 > (2)
.endif
# expect+1: Malformed conditional ((3) > 2)
.if (3) > 2
.endif
# Test for deeply nested conditions.
.if (((((((((((((((((((((((((((((((((((((((((((((((((((((((( \
(((((((((((((((((((((((((((((((((((((((((((((((((((((((( \
1 \
)))))))))))))))))))))))))))))))))))))))))))))))))))))))) \
))))))))))))))))))))))))))))))))))))))))))))))))))))))))
# Parentheses can be nested at least to depth 112. There is nothing special
# about this number though, much higher numbers work as well, at least on
# NetBSD. The actual limit depends on the allowed call stack depth for C code
# of the platform. Anyway, 112 should be enough for all practical purposes.
.else
. error
.endif
# An unbalanced opening parenthesis is a parse error.
# expect+1: Malformed conditional (()
.if (
. error
.else
. error
.endif
# An unbalanced closing parenthesis is a parse error.
#
# Before cond.c 1.237 from 2021-01-19, CondParser_Term returned TOK_RPAREN
# even though the documentation of that function promised to only ever return
# TOK_TRUE, TOK_FALSE or TOK_ERROR. In cond.c 1.241, the return type of that
# function was changed to a properly restricted enum type, to prevent this bug
# from occurring again.
# expect+1: Malformed conditional ())
.if )
. error
.else
. error
.endif
all:
@:;
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