From 4d008876be6c5f3ff3209a2b07c125927b15e2bd Mon Sep 17 00:00:00 2001
From: brooks <brooks@FreeBSD.org>
Date: Wed, 15 May 2013 13:04:10 +0000
Subject: Add a new option WITHOUT_FORMAT_EXTENSIONS to disable flags related
 to checking our kernel printf extensions.  This is useful to allow compilers
 without these extensions to build kernels.

Sponsored by:	DARPA, AFRL
---
 sys/conf/kern.mk | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'sys/conf/kern.mk')

diff --git a/sys/conf/kern.mk b/sys/conf/kern.mk
index e42b753..99211f0 100644
--- a/sys/conf/kern.mk
+++ b/sys/conf/kern.mk
@@ -5,7 +5,7 @@
 #
 CWARNFLAGS?=	-Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
 		-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
-		-Wundef -Wno-pointer-sign -fformat-extensions \
+		-Wundef -Wno-pointer-sign ${FORMAT_EXTENTIONS} \
 		-Wmissing-include-dirs -fdiagnostics-show-option \
 		${CWARNEXTRA}
 #
@@ -29,7 +29,15 @@ NO_WSOMETIMES_UNINITIALIZED=	-Wno-error-sometimes-uninitialized
 # enough to error out the whole kernel build.  Display them anyway, so there is
 # some incentive to fix them eventually.
 CWARNEXTRA?=	-Wno-error-tautological-compare -Wno-error-empty-body \
-		-Wno-error-parentheses-equality
+		-Wno-error-parentheses-equality ${NO_WFORMAT}
+.endif
+
+# External compilers may not support our format extensions.  Allow them
+# to be disabled.  WARNING: format checking is disabled in this case.
+.if ${MK_FORMAT_EXTENSIONS} == "no"
+NO_WFORMAT=		-Wno-format
+.else
+FORMAT_EXTENTIONS=	-fformat-extensions
 .endif
 
 #
-- 
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