1 files changed, 79 insertions, 0 deletions
diff --git a/contrib/bmake/unit-tests/posix-varassign.mk b/contrib/bmake/unit-tests/posix-varassign.mk
new file mode 100644
index 000000000000..6b9b2f083e3e
--- /dev/null
+++ b/contrib/bmake/unit-tests/posix-varassign.mk
@@ -0,0 +1,79 @@
+# $NetBSD: posix-varassign.mk,v 1.1 2025/04/13 09:29:33 rillig Exp $
+#
+# https://pubs.opengroup.org/onlinepubs/9799919799/utilities/make.html#tag_20_76_13_05
+#
+# Test that variable assignments work in the same way as in default mode.
+#
+# The assignment operators "::=" and ":::=" are intentionally not supported,
+# as they would introduce the distinction between eagerly and lazily evaluated
+# macros, in addition to the eagerly and lazily evaluated assignments, and
+# this would add too much complexity to the user's mental model, for too
+# little benefit.
+
+.POSIX:
+
+
+VAR=	value
+.if ${VAR} != "value"
+.  error
+.endif
+
+
+# Deviation from POSIX: The "::=" assignment operator is not supported,
+# instead, the variable named "VAR:" is defined.
+VAR=	before
+VAR::=	posix-immediate-expansion
+.if ${VAR} != "before"
+.  error
+.elif ${${:UVAR\:}} != "posix-immediate-expansion"
+.  error
+.endif
+
+
+# Deviation from POSIX: The ":::=" assignment operator is not supported,
+# instead, the variable named "VAR::" is defined.
+VAR:::=	posix-delayed-expansion
+.if ${VAR} != "before"
+.  error
+.elif ${${:UVAR\:\:}} != "posix-delayed-expansion"
+.  error
+.endif
+
+
+VAR!=	echo from shell command
+.if ${VAR} != "from shell command"
+.  error
+.endif
+
+
+VAR=	value
+VAR?=	fallback
+.if ${VAR} != "value"
+.  error
+.endif
+.undef VAR
+VAR?=	fallback
+.if ${VAR} != "fallback"
+.  error
+.endif
+
+
+VAR=	value
+VAR+=	appended
+.if ${VAR} != "value appended"
+.  error
+.endif
+
+
+# In POSIX mode, the ":=" assignment operator is available as well, even
+# though it is not specified by POSIX, due to the differences in existing
+# make implementations.
+REF=	before
+VAR:=	immediate ${REF}
+REF=	after
+.if ${VAR} != "immediate before"
+.  error
+.endif
+
+
+all: