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make: document since when indirect modifiers are supported

This commit is contained in:
rillig 2021-02-14 17:22:37 +00:00
parent 7d5825c040
commit a6cd09f3da
1 changed files with 5 additions and 3 deletions
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8
usr.bin/make/unit-tests/varmod-indirect.mk
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@ -1,11 +1,13 @@
# $NetBSD: varmod-indirect.mk,v 1.6 2021/02/14 16:12:46 rillig Exp $
# $NetBSD: varmod-indirect.mk,v 1.7 2021/02/14 17:22:37 rillig Exp $
#
# Tests for indirect variable modifiers, such as in ${VAR:${M_modifiers}}.
# These can be used for very basic purposes like converting a string to either
# uppercase or lowercase, as well as for fairly advanced modifiers that first
# look like line noise and are hard to decipher.
#
# TODO: Since when are indirect modifiers supported?
# Initial support for indirect modifiers was added in var.c 1.101 from
# 2006-02-18. Since var.c 1.108 from 2006-05-11 it is possible to use
# indirect modifiers for all but the very first modifier as well.
# To apply a modifier indirectly via another variable, the whole
@ -202,7 +204,7 @@ _:= before ${UNDEF:${:UZ}} after
# interpretation only lasts until the end of the indirect modifier, it does
# not influence the outer variable expression.
#
# In this expression, the direct ':ts*' has no effect since ':U' does not
# In this first expression, the direct ':ts*' has no effect since ':U' does not
# treat the expression value as a list of words but as a single word. It has
# to be ':U', not ':D', since the "expression name" is "1 2 3" and there is no
# variable of that name.