varparse-dynamic.mk revision 1.4
11.4Srillig# $NetBSD: varparse-dynamic.mk,v 1.4 2021/02/04 21:42:47 rillig Exp $ 21.1Srillig 31.1Srillig# Before 2020-07-27, there was an off-by-one error in Var_Parse that skipped 41.1Srillig# the last character in the variable name. 51.1Srillig# To trigger the bug, the variable must not be defined. 61.1Srillig.if ${.TARGET} # exact match, may be undefined 71.1Srillig.endif 81.1Srillig.if ${.TARGEX} # 1 character difference, must be defined 91.1Srillig.endif 101.1Srillig.if ${.TARGXX} # 2 characters difference, must be defined 111.1Srillig.endif 121.1Srillig 131.2Srillig# When a dynamic variable (such as .TARGET) is evaluated in the global 141.4Srillig# scope, it is not yet ready to be expanded. Therefore the complete 151.2Srillig# expression is returned as the variable value, hoping that it can be 161.2Srillig# resolved at a later point. 171.2Srillig# 181.2Srillig# This test covers the code in Var_Parse that deals with VAR_JUNK but not 191.2Srillig# VAR_KEEP for dynamic variables. 201.2Srillig.if ${.TARGET:S,^,,} != "\${.TARGET:S,^,,}" 211.2Srillig. error 221.2Srillig.endif 231.2Srillig 241.4Srillig# If a dynamic variable is expanded in a non-local scope, the expression 251.3Srillig# based on this variable is not expanded. But there may be nested variable 261.3Srillig# expressions in the modifiers, and these are kept unexpanded as well. 271.3Srillig.if ${.TARGET:M${:Ufallback}} != "\${.TARGET:M\${:Ufallback}}" 281.3Srillig. error 291.3Srillig.endif 301.3Srillig.if ${.TARGET:M${UNDEF}} != "\${.TARGET:M\${UNDEF}}" 311.3Srillig. error 321.3Srillig.endif 331.3Srillig 341.1Srilligall: 351.1Srillig @: 36