Module Name: src
Committed By: rillig
Date: Sun Oct 4 08:02:17 UTC 2020
Modified Files:
src/usr.bin/make/unit-tests: var-op-sunsh.mk
Log Message:
make(1): test another edge case for the :sh assignment
To generate a diff of this commit:
cvs rdiff -u -r1.2 -r1.3 src/usr.bin/make/unit-tests/var-op-sunsh.mk
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/usr.bin/make/unit-tests/var-op-sunsh.mk
diff -u src/usr.bin/make/unit-tests/var-op-sunsh.mk:1.2 src/usr.bin/make/unit-tests/var-op-sunsh.mk:1.3
--- src/usr.bin/make/unit-tests/var-op-sunsh.mk:1.2 Sun Oct 4 07:49:45 2020
+++ src/usr.bin/make/unit-tests/var-op-sunsh.mk Sun Oct 4 08:02:17 2020
@@ -1,4 +1,4 @@
-# $NetBSD: var-op-sunsh.mk,v 1.2 2020/10/04 07:49:45 rillig Exp $
+# $NetBSD: var-op-sunsh.mk,v 1.3 2020/10/04 08:02:17 rillig Exp $
#
# Tests for the :sh= variable assignment operator, which runs its right-hand
# side through the shell. It is a seldom-used alternative to the !=
@@ -71,5 +71,23 @@ VAR.key:shift= Shift
. error
.endif
+# Just for fun: The code in Parse_IsVar allows for multiple appearances of
+# the ':sh' assignment operator modifier. Let's see what happens ...
+#
+# Well, the end result is correct but the way until there is rather
+# adventurous. This only works because the parser replaces each an every
+# whitespace character that is not nested with '\0' (see Parse_DoVar).
+# The variable name therefore ends before the first ':sh', and the last
+# ':sh' turns the assignment operator into the shell command evaluation.
+# Parse_DoVar completely trusts Parse_IsVar to properly verify the syntax.
+#
+# The ':sh' is the only word that may occur between the variable name and
+# the assignment operator. All other words would lead to a parse error
+# since the left-hand side of an assignment must be exactly one word.
+VAR :sh :sh :sh :sh= echo multiple
+.if ${VAR} != "multiple"
+. error
+.endif
+
all:
@:;
