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-rw-r--r--contrib/bmake/unit-tests/opt-debug-file.mk14
1 files changed, 12 insertions, 2 deletions
diff --git a/contrib/bmake/unit-tests/opt-debug-file.mk b/contrib/bmake/unit-tests/opt-debug-file.mk
index 33a35e0a458a..d107f177dae3 100644
--- a/contrib/bmake/unit-tests/opt-debug-file.mk
+++ b/contrib/bmake/unit-tests/opt-debug-file.mk
@@ -1,4 +1,4 @@
-# $NetBSD: opt-debug-file.mk,v 1.11 2024/06/30 15:21:24 rillig Exp $
+# $NetBSD: opt-debug-file.mk,v 1.12 2025/07/06 08:48:34 rillig Exp $
#
# Tests for the -dF command line option, which redirects the debug log
# to a file instead of writing it to stderr.
@@ -27,7 +27,9 @@ DEBUG_OUTPUT:= ${:!cat opt-debug-file.debuglog!}
.endif
# To get the unexpanded text that was actually written to the debug log
-# file, the content of that log file must not be stored in a variable.
+# file, the content of that log file must not be stored in a variable
+# directly. Instead, it can be processed in a single expression by a chain
+# of modifiers.
#
# XXX: In the :M modifier, a dollar is escaped using '$$', not '\$'. This
# escaping scheme unnecessarily differs from all other modifiers.
@@ -35,6 +37,14 @@ DEBUG_OUTPUT:= ${:!cat opt-debug-file.debuglog!}
. error
.endif
+# To get the unexpanded text that was actually written to the debug log
+# file, the content of that log file must not be stored in a variable
+# directly. Instead, each dollar sign must be escaped first.
+DEBUG_OUTPUT:= ${:!cat opt-debug-file.debuglog!:S,\$,\$\$,g}
+.if ${DEBUG_OUTPUT:M*Uexpanded*} != "\${:Uexpanded}"
+. error
+.endif
+
.MAKEFLAGS: -d0