1 files changed, 39 insertions, 0 deletions
diff --git a/unit-tests/cond-cmp-string.mk b/unit-tests/cond-cmp-string.mk
new file mode 100644
index 0000000000000..67d86b61e88dd
--- /dev/null
+++ b/unit-tests/cond-cmp-string.mk
@@ -0,0 +1,39 @@
+# $NetBSD: cond-cmp-string.mk,v 1.3 2020/08/20 18:43:19 rillig Exp $
+#
+# Tests for string comparisons in .if conditions.
+
+# This is a simple comparison of string literals.
+# Nothing surprising here.
+.if "str" != "str"
+.error
+.endif
+
+# The right-hand side of the comparison may be written without quotes.
+.if "str" != str
+.error
+.endif
+
+# The left-hand side of the comparison must be enclosed in quotes.
+# This one is not enclosed in quotes and thus generates an error message.
+.if str != str
+.error
+.endif
+
+# The left-hand side of the comparison requires a defined variable.
+# The variable named "" is not defined, but applying the :U modifier to it
+# makes it "kind of defined" (see VAR_KEEP).  Therefore it is ok here.
+.if ${:Ustr} != "str"
+.error
+.endif
+
+# Any character in a string literal may be escaped using a backslash.
+# This means that "\n" does not mean a newline but a simple "n".
+.if "string" != "\s\t\r\i\n\g"
+.error
+.endif
+
+# It is not possible to concatenate two string literals to form a single
+# string.
+.if "string" != "str""ing"
+.error
+.endif