90 lines
3.0 KiB
Makefile
90 lines
3.0 KiB
Makefile
# $NetBSD: varname.mk,v 1.14 2023/11/19 21:47:52 rillig Exp $
|
|
#
|
|
# Tests for special variables, such as .MAKE or .PARSEDIR.
|
|
# And for variable names in general.
|
|
|
|
.MAKEFLAGS: -dv
|
|
|
|
# In variable names, braces are allowed, but they must be balanced.
|
|
# Parentheses and braces may be mixed.
|
|
VAR{{{}}}= 3 braces
|
|
.if "${VAR{{{}}}}" != "3 braces"
|
|
. error
|
|
.endif
|
|
|
|
# In expressions, the parser works differently. It doesn't treat
|
|
# braces and parentheses equally, therefore the first closing brace already
|
|
# marks the end of the variable name.
|
|
VARNAME= VAR(((
|
|
${VARNAME}= 3 open parentheses
|
|
.if "${VAR(((}}}}" != "3 open parentheses}}}"
|
|
. error
|
|
.endif
|
|
|
|
# In the above test, the variable name is constructed indirectly. Neither
|
|
# of the following expressions produces the intended effect.
|
|
#
|
|
# This is not a variable assignment since the parentheses and braces are not
|
|
# balanced. At the end of the line, there are still 3 levels open, which
|
|
# means the variable name is not finished.
|
|
# expect+2: Error in archive specification: "VAR"
|
|
# expect+1: No closing parenthesis in archive specification
|
|
${:UVAR(((}= try1
|
|
# On the left-hand side of a variable assignments, the backslash is not parsed
|
|
# as an escape character, therefore the parentheses still count to the nesting
|
|
# level, which at the end of the line is still 3. Therefore this is not a
|
|
# variable assignment as well.
|
|
# expect+1: Invalid line '${:UVAR\(\(\(}= try2', expanded to 'VAR\(\(\(= try2'
|
|
${:UVAR\(\(\(}= try2
|
|
# To assign to a variable with an arbitrary name, the variable name has to
|
|
# come from an external source, not the text that is parsed in the assignment
|
|
# itself. This is exactly the reason why further above, the indirect
|
|
# ${VARNAME} works, while all other attempts fail.
|
|
${VARNAME}= try3
|
|
|
|
.MAKEFLAGS: -d0
|
|
|
|
# All variable names of a scope are stored in the same hash table, using a
|
|
# simple hash function. Ensure that HashTable_Find handles collisions
|
|
# correctly and that the correct variable is looked up. The strings "0x" and
|
|
# "1Y" have the same hash code, as 31 * '0' + 'x' == 31 * '1' + 'Y'.
|
|
V.0x= 0x
|
|
V.1Y= 1Y
|
|
.if ${V.0x} != "0x" || ${V.1Y} != "1Y"
|
|
. error
|
|
.endif
|
|
|
|
# The string "ASDZguv", when used as a prefix of a variable name, keeps the
|
|
# hash code unchanged, its own hash code is 0.
|
|
ASDZguvV.0x= 0x
|
|
ASDZguvV.1Y= 1Y
|
|
.if ${ASDZguvV.0x} != "0x"
|
|
. error
|
|
.elif ${ASDZguvV.1Y} != "1Y"
|
|
. error
|
|
.endif
|
|
|
|
# Ensure that variables with the same hash code whose name is a prefix of the
|
|
# other can be accessed. In this case, the shorter variable name is defined
|
|
# first to make it appear later in the bucket of the hash table.
|
|
ASDZguv= once
|
|
ASDZguvASDZguv= twice
|
|
.if ${ASDZguv} != "once"
|
|
. error
|
|
.elif ${ASDZguvASDZguv} != "twice"
|
|
. error
|
|
.endif
|
|
|
|
# Ensure that variables with the same hash code whose name is a prefix of the
|
|
# other can be accessed. In this case, the longer variable name is defined
|
|
# first to make it appear later in the bucket of the hash table.
|
|
ASDZguvASDZguv.param= twice
|
|
ASDZguv.param= once
|
|
.if ${ASDZguv.param} != "once"
|
|
. error
|
|
.elif ${ASDZguvASDZguv.param} != "twice"
|
|
. error
|
|
.endif
|
|
|
|
all:
|