15ad769f6SSimon J. Gerraty# $NetBSD: varparse-dynamic.mk,v 1.10 2025/01/11 21:21:34 rillig Exp $ 26bbc783fSSimon J. Gerraty 36bbc783fSSimon J. Gerraty# Before 2020-07-27, there was an off-by-one error in Var_Parse that skipped 46bbc783fSSimon J. Gerraty# the last character in the variable name. 53e39ce56SSimon J. Gerraty# To trigger the bug, the variable had to be undefined. 66bbc783fSSimon J. Gerraty.if ${.TARGET} # exact match, may be undefined 76bbc783fSSimon J. Gerraty.endif 85ad769f6SSimon J. Gerraty# expect+1: Variable ".TARGEX" is undefined 96bbc783fSSimon J. Gerraty.if ${.TARGEX} # 1 character difference, must be defined 106bbc783fSSimon J. Gerraty.endif 115ad769f6SSimon J. Gerraty# expect+1: Variable ".TARGXX" is undefined 126bbc783fSSimon J. Gerraty.if ${.TARGXX} # 2 characters difference, must be defined 136bbc783fSSimon J. Gerraty.endif 146bbc783fSSimon J. Gerraty 15302da1a3SSimon J. Gerraty# When a dynamic variable (such as .TARGET) is evaluated in the global 168b6f73e3SSimon J. Gerraty# scope, it is not yet ready to be expanded. Therefore the complete 17302da1a3SSimon J. Gerraty# expression is returned as the variable value, hoping that it can be 18302da1a3SSimon J. Gerraty# resolved at a later point. 19302da1a3SSimon J. Gerraty# 20ee914ef9SSimon J. Gerraty# This test covers the code in Var_Parse that deals with DEF_UNDEF but not 21ee914ef9SSimon J. Gerraty# DEF_DEFINED for dynamic variables. 22302da1a3SSimon J. Gerraty.if ${.TARGET:S,^,,} != "\${.TARGET:S,^,,}" 23302da1a3SSimon J. Gerraty. error 24302da1a3SSimon J. Gerraty.endif 25302da1a3SSimon J. Gerraty 268b6f73e3SSimon J. Gerraty# If a dynamic variable is expanded in a non-local scope, the expression 277a05a715SSimon J. Gerraty# based on this variable is not expanded. But there may be nested 288e11a9b4SSimon J. Gerraty# expressions in the modifiers, and these are kept unexpanded as well. 298e11a9b4SSimon J. Gerraty.if ${.TARGET:M${:Ufallback}} != "\${.TARGET:M\${:Ufallback}}" 308e11a9b4SSimon J. Gerraty. error 318e11a9b4SSimon J. Gerraty.endif 328e11a9b4SSimon J. Gerraty.if ${.TARGET:M${UNDEF}} != "\${.TARGET:M\${UNDEF}}" 338e11a9b4SSimon J. Gerraty. error 348e11a9b4SSimon J. Gerraty.endif 35