From ebe0a1c9f1d1529a3f2c64d628686f500d460b0e Mon Sep 17 00:00:00 2001
From: Dmitry Goncharov <dgoncharov@users.sf.net>
Date: Sun, 30 Apr 2023 09:30:19 -0400
Subject: [SV 64115] Suppress warnings about undefined GNUMAKEFLAGS

* src/variable.c (defined_vars): Add GNUMAKEFLAGS to defined variables.
* tests/scripts/options/warn: Add a test.
---
 src/variable.c             |  1 +
 tests/scripts/options/warn | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/src/variable.c b/src/variable.c
index bfaef6c1..63a8968b 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -1916,6 +1916,7 @@ static const struct defined_vars defined_vars[] = {
   { STRING_SIZE_TUPLE ("VPATH") },
   { STRING_SIZE_TUPLE ("GPATH") },
   { STRING_SIZE_TUPLE (WARNINGS_NAME) },
+  { STRING_SIZE_TUPLE (GNUMAKEFLAGS_NAME) },
   { NULL, 0 }
 };
 
diff --git a/tests/scripts/options/warn b/tests/scripts/options/warn
index 8c66658e..2b862a58 100644
--- a/tests/scripts/options/warn
+++ b/tests/scripts/options/warn
@@ -16,6 +16,17 @@ all:; @#HELPER# env MAKEFLAGS
 !,
               '--warn-undefined-variables', "MF= --warn=undefined-var\nMAKEFLAGS= --warn=undefined-var");
 
+# sv 64115.
+# Verify that -R along with --warn-undefined-variables do not warn about
+# internal variables, such as GNUMAKEFLAGS.
+
+run_make_test(q!
+$(info MF=$(MAKEFLAGS))
+all:; @#HELPER# env MAKEFLAGS
+!,
+              '-R --warn-undefined-variables', "MF=rR --warn=undefined-var\nMAKEFLAGS=rR --warn=undefined-var");
+
+
 # Verify parsing of --warn in various forms.
 
 while (my ($f, $r) = each %warn_test) {
-- 
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