D44145.diff
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	diff --git a/sys/conf/kern.mk b/sys/conf/kern.mk
	--- a/sys/conf/kern.mk
	+++ b/sys/conf/kern.mk
	@@ -276,14 +276,10 @@

	CSTD?= gnu17

	-.if ${CSTD} == "k&r"
	-CFLAGS+= -traditional
	-.elif ${CSTD} == "c89" \|\| ${CSTD} == "c90"
	-CFLAGS+= -std=iso9899:1990
	-.elif ${CSTD} == "c94" \|\| ${CSTD} == "c95"
	-CFLAGS+= -std=iso9899:199409
	-.elif ${CSTD} == "c99"
	-CFLAGS+= -std=iso9899:1999
	+# c99/gnu99 is the minimum C standard version supported for kernel build
	+.if ${CSTD} == "k&r" \|\| ${CSTD} == "c89" \|\| ${CSTD} == "c90" \|\| \
	+ ${CSTD} == "c94" \|\| ${CSTD} == "c95"
	+.error "Only c99/gnu99 or later is supported"
	.else # CSTD
	CFLAGS+= -std=${CSTD}
	.endif # CSTD