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make(1): document handling of irrelevant conditions before 2020-07-09

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This commit is contained in:
rillig 2020-12-01 19:37:23 +00:00
parent c81fc28b06
commit 44b654a638
1 changed files with 5 additions and 4 deletions
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9
usr.bin/make/unit-tests/cond-short.mk
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@ -1,4 +1,4 @@
# $NetBSD: cond-short.mk,v 1.14 2020/12/01 19:33:50 rillig Exp $
# $NetBSD: cond-short.mk,v 1.15 2020/12/01 19:37:23 rillig Exp $
#
# Demonstrates that in conditions, the right-hand side of an && or ||
# is only evaluated if it can actually influence the result.
@ -200,9 +200,10 @@ x= Fail
.endif
x!= echo '0 || $${iV2:U2} < $${V42}: $x' >&2; echo
# TODO: Has this always worked? There may have been a time, maybe around
# 2000, when make would complain about the "Malformed conditional" because
# UNDEF is not defined.
# The right-hand side of the '&&' is irrelevant since the left-hand side
# already evaluates to false. Before cond.c 1.79 from 2020-07-09, it was
# expanded nevertheless, although with a small modification: undefined
# variables may be used in these expressions without generating an error.
.if defined(UNDEF) && ${UNDEF} != "undefined"
. error
.endif