1# $NetBSD: varmod.mk,v 1.3 2020/09/13 07:42:20 rillig Exp $ 2# 3# Tests for variable modifiers, such as :Q, :S,from,to or :Ufallback. 4 5DOLLAR1= $$ 6DOLLAR2= ${:U\$} 7 8# To get a single '$' sign in the value of a variable expression, it has to 9# be written as '$$' in a literal variable value. 10# 11# See Var_Parse, where it calls Var_Subst. 12.if ${DOLLAR1} != "\$" 13. error 14.endif 15 16# Another way to get a single '$' sign is to use the :U modifier. In the 17# argument of that modifier, a '$' is escaped using the backslash instead. 18# 19# See Var_Parse, where it calls Var_Subst. 20.if ${DOLLAR2} != "\$" 21. error 22.endif 23 24# It is also possible to use the :U modifier directly in the expression. 25# 26# See Var_Parse, where it calls Var_Subst. 27.if ${:U\$} != "\$" 28. error 29.endif 30 31# XXX: As of 2020-09-13, it is not possible to use '$$' in a variable name 32# to mean a single '$'. This contradicts the manual page, which says that 33# '$' can be escaped as '$$'. 34.if ${$$:L} != "" 35. error 36.endif 37 38# In lint mode, make prints helpful error messages. 39# For compatibility, make does not print these error messages in normal mode. 40# Should it? 41.MAKEFLAGS: -dL 42.if ${$$:L} != "" 43. error 44.endif 45 46# A '$' followed by nothing is an error as well. 47.if ${:Uword:@word@${word}$@} != "word" 48. error 49.endif 50 51all: # nothing 52