diff options
Diffstat (limited to 'unit-tests/var-op-append.mk')
| -rw-r--r-- | unit-tests/var-op-append.mk | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/unit-tests/var-op-append.mk b/unit-tests/var-op-append.mk index b75880f95838..009a469e31ef 100644 --- a/unit-tests/var-op-append.mk +++ b/unit-tests/var-op-append.mk @@ -1,9 +1,48 @@ -# $NetBSD: var-op-append.mk,v 1.2 2020/08/16 14:25:16 rillig Exp $ +# $NetBSD: var-op-append.mk,v 1.7 2020/10/30 20:36:33 rillig Exp $ # # Tests for the += variable assignment operator, which appends to a variable, # creating it if necessary. -# TODO: Implementation +# Appending to an undefined variable is possible. +# The variable is created, and no extra space is added before the value. +VAR+= one +.if ${VAR} != "one" +. error +.endif + +# Appending to an existing variable adds a single space and the value. +VAR+= two +.if ${VAR} != "one two" +. error +.endif + +# Appending an empty string nevertheless adds a single space. +VAR+= # empty +.if ${VAR} != "one two " +. error +.endif + +# Variable names may contain '+', and this character is also part of the +# '+=' assignment operator. As far as possible, the '+' is interpreted as +# part of the assignment operator. +# +# See Parse_DoVar +C++= value +.if ${C+} != "value" || defined(C++) +. error +.endif + +# Try out how often the variable name is expanded when appending to a +# nonexistent variable. +# As of 2020-10-30, that's two times. +# XXX: That's one time too often. +# See Var_Append, the call to Var_Set. +.MAKEFLAGS: -dv +VAR.${:U\$\$\$\$\$\$\$\$}+= dollars +.MAKEFLAGS: -d0 +.if ${VAR.${:U\$\$\$\$}} != "dollars" +. error +.endif all: @:; |