From e47381c9fc72c16e063da71fb32191e402948a50 Mon Sep 17 00:00:00 2001
From: "Stephen J. Kiernan" <stevek@FreeBSD.org>
Date: Fri, 29 Sep 2023 11:04:45 -0400
Subject: Allow for CSTD to be set kernel module Makefiles before inclusion

Use ?= when setting the default value for CSTD so it can be set by
Makefiles before inclusion and not be overridden by the .mk file.

Reviewed by:	imp, sjg
Obtained from:	Juniper Networks, Inc.
Differential Revision:	https://reviews.freebsd.org/D42019
---
 sys/conf/kern.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/conf/kern.mk b/sys/conf/kern.mk
index e00e025ab91b..b508bc81b5f0 100644
--- a/sys/conf/kern.mk
+++ b/sys/conf/kern.mk
@@ -271,7 +271,7 @@ PHONY_NOTMAIN = afterdepend afterinstall all beforedepend beforeinstall \
 .PHONY: ${PHONY_NOTMAIN}
 .NOTMAIN: ${PHONY_NOTMAIN}
 
-CSTD=		gnu99
+CSTD?=		gnu99
 
 .if ${CSTD} == "k&r"
 CFLAGS+=        -traditional
-- 
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