From c43d54826fd92017b9d7d49a5f660d98c0393e02 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Sat, 27 Jul 2024 19:05:00 -0400
Subject: build/flags: Add -Wmissing-variable-declarations if supported

---
 build/flags.mk                  | 3 ++-
 build/flags/missing-var-decls.c | 9 +++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 build/flags/missing-var-decls.c

diff --git a/build/flags.mk b/build/flags.mk
index 95d5673..5c28c3f 100644
--- a/build/flags.mk
+++ b/build/flags.mk
@@ -105,7 +105,8 @@ include build/exports.mk
 
 # Conditionally-supported flags
 AUTO_FLAGS := \
-    gen/flags/deps.mk
+    gen/flags/deps.mk \
+    gen/flags/missing-var-decls.mk
 
 gen/flags.mk: ${AUTO_FLAGS}
 	${MSG} "[ GEN] $@"
diff --git a/build/flags/missing-var-decls.c b/build/flags/missing-var-decls.c
new file mode 100644
index 0000000..5c20cc6
--- /dev/null
+++ b/build/flags/missing-var-decls.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/// _CFLAGS += -Wmissing-variable-declarations
+/// -Werror
+
+int main(void) {
+	return 0;
+}
-- 
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