2021-12-18 07:27:22 +00:00
|
|
|
# $NetBSD: varmod-loop-varname.mk,v 1.4 2021/12/05 15:01:04 rillig Exp $
|
2021-06-25 18:16:24 +00:00
|
|
|
#
|
|
|
|
# Tests for the first part of the variable modifier ':@var@...@', which
|
|
|
|
# contains the variable name to use during the loop.
|
|
|
|
|
2021-12-18 07:27:22 +00:00
|
|
|
# Force the test results to be independent of the default value of this
|
|
|
|
# setting, which is 'yes' for NetBSD's usr.bin/make but 'no' for the bmake
|
|
|
|
# distribution and pkgsrc/devel/bmake.
|
2021-06-25 18:16:24 +00:00
|
|
|
.MAKE.SAVE_DOLLARS= yes
|
|
|
|
|
|
|
|
|
|
|
|
# Before 2021-04-04, the name of the loop variable could be generated
|
|
|
|
# dynamically. There was no practical use-case for this.
|
|
|
|
# Since var.c 1.907 from 2021-04-04, a '$' is no longer allowed in the
|
|
|
|
# variable name.
|
|
|
|
.if ${:Uone two three:@${:Ubar:S,b,v,}@+${var}+@} != "+one+ +two+ +three+"
|
|
|
|
. error
|
2021-12-18 07:27:22 +00:00
|
|
|
.else
|
|
|
|
. error
|
2021-06-25 18:16:24 +00:00
|
|
|
.endif
|
|
|
|
|
|
|
|
|
|
|
|
# ":::" is a very creative variable name, unlikely to occur in practice.
|
|
|
|
# The expression ${\:\:\:} would not work since backslashes can only
|
|
|
|
# be escaped in the modifiers, but not in the variable name, therefore
|
|
|
|
# the extra indirection via the modifier ':U'.
|
|
|
|
.if ${:U1 2 3:@:::@x${${:U\:\:\:}}y@} != "x1y x2y x3y"
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
|
|
|
|
|
|
|
|
# "@@" is another creative variable name.
|
|
|
|
.if ${:U1 2 3:@\@\@@x${@@}y@} != "x1y x2y x3y"
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
|
|
|
|
|
|
|
|
# In extreme cases, even the backslash can be used as variable name.
|
|
|
|
# It needs to be doubled though.
|
|
|
|
.if ${:U1 2 3:@\\@x${${:Ux:S,x,\\,}}y@} != "x1y x2y x3y"
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
|
|
|
|
|
|
|
|
# The variable name can technically be empty, and in this situation
|
|
|
|
# the variable value cannot be accessed since the empty "variable"
|
|
|
|
# is protected to always return an empty string.
|
|
|
|
.if ${:U1 2 3:@@x${}y@} != "xy xy xy"
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
|
|
|
|
|
|
|
|
# The :@ modifier resolves the variables from the replacement text once more
|
|
|
|
# than expected. In particular, it resolves _all_ variables from the scope,
|
|
|
|
# and not only the loop variable (in this case v).
|
|
|
|
SRCS= source
|
|
|
|
CFLAGS.source= before
|
|
|
|
ALL_CFLAGS:= ${SRCS:@src@${CFLAGS.${src}}@} # note the ':='
|
|
|
|
CFLAGS.source+= after
|
|
|
|
.if ${ALL_CFLAGS} != "before"
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
|
|
|
|
|
|
|
|
# In the following example, the modifier ':@' expands the '$$' to '$'. This
|
|
|
|
# means that when the resulting expression is evaluated, these resulting '$'
|
|
|
|
# will be interpreted as starting a subexpression.
|
|
|
|
#
|
|
|
|
# The d means direct reference, the i means indirect reference.
|
|
|
|
RESOLVE= ${RES1} $${RES1}
|
|
|
|
RES1= 1d${RES2} 1i$${RES2}
|
|
|
|
RES2= 2d${RES3} 2i$${RES3}
|
|
|
|
RES3= 3
|
|
|
|
|
|
|
|
.if ${RESOLVE:@v@w${v}w@} != "w1d2d3w w2i3w w1i2d3 2i\${RES3}w w1d2d3 2i\${RES3} 1i\${RES2}w"
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
|
|
|
|
|
|
|
|
# Until 2020-07-20, the variable name of the :@ modifier could end with one
|
|
|
|
# or two dollar signs, which were silently ignored.
|
|
|
|
# There's no point in allowing a dollar sign in that position.
|
|
|
|
# Since var.c 1.907 from 2021-04-04, a '$' is no longer allowed in the
|
|
|
|
# variable name.
|
|
|
|
.if ${1 2 3:L:@v$@($v)@} != "(1) (2) (3)"
|
|
|
|
. error
|
|
|
|
.else
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
.if ${1 2 3:L:@v$$@($v)@} != "() () ()"
|
|
|
|
. error
|
|
|
|
.else
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
.if ${1 2 3:L:@v$$$@($v)@} != "() () ()"
|
|
|
|
. error
|
|
|
|
.else
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
|
|
|
|
|
|
|
|
# It may happen that there are nested :@ modifiers that use the same name for
|
|
|
|
# for the loop variable. These modifiers influence each other.
|
|
|
|
#
|
|
|
|
# As of 2020-10-18, the :@ modifier is implemented by actually setting a
|
|
|
|
# variable in the scope of the expression and deleting it again after the
|
|
|
|
# loop. This is different from the .for loops, which substitute the variable
|
|
|
|
# expression with ${:Uvalue}, leading to different unwanted side effects.
|
|
|
|
#
|
|
|
|
# To make the behavior more predictable, the :@ modifier should restore the
|
|
|
|
# loop variable to the value it had before the loop. This would result in
|
|
|
|
# the string "1a b c1 2a b c2 3a b c3", making the two loops independent.
|
|
|
|
.if ${:U1 2 3:@i@$i${:Ua b c:@i@$i@}${i:Uu}@} != "1a b cu 2a b cu 3a b cu"
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
|
|
|
|
# During the loop, the variable is actually defined and nonempty.
|
|
|
|
# If the loop were implemented in the same way as the .for loop, the variable
|
|
|
|
# would be neither defined nor nonempty since all expressions of the form
|
|
|
|
# ${var} would have been replaced with ${:Uword} before evaluating them.
|
|
|
|
.if defined(var)
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
.if ${:Uword:@var@${defined(var):?def:undef} ${empty(var):?empty:nonempty}@} \
|
|
|
|
!= "def nonempty"
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
.if defined(var)
|
|
|
|
. error
|
|
|
|
.endif
|
|
|
|
|
|
|
|
all: .PHONY
|