1# $NetBSD: dep-var.mk,v 1.1 2020/08/22 16:51:26 rillig Exp $ 2# 3# Tests for variable references in dependency declarations. 4# 5# Uh oh, this feels so strange that probably nobody uses it. But it seems to 6# be the only way to reach the lower half of SuffExpandChildren. 7 8# XXX: The -dv log says: 9# Var_Parse: ${UNDEF1} with VARE_UNDEFERR|VARE_WANTRES 10# but no error message is generated for this line. 11# The variable expression ${UNDEF1} simply expands to an empty string. 12all: ${UNDEF1} 13 14# Using a double dollar in order to circumvent immediate variable expansion 15# feels like unintended behavior. At least the manual page says nothing at 16# all about defined or undefined variables in dependency lines. 17# 18# At the point where the expression ${DEF2} is expanded, the variable DEF2 19# is defined, so everything's fine. 20all: $${DEF2} 21 22# This variable is not defined at all. 23# XXX: The -dv log says: 24# Var_Parse: ${UNDEF3} with VARE_UNDEFERR|VARE_WANTRES 25# but no error message is generated for this line, just like for UNDEF1. 26# The variable expression ${UNDEF3} simply expands to an empty string. 27all: $${UNDEF3} 28 29UNDEF1= undef1 30DEF2= def2 31 32undef1 def2: 33 @echo ${.TARGET} 34