D34784.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
	@@ -43,7 +43,11 @@
	CWARNEXTRA+= -Wno-error=shift-negative-value
	CWARNEXTRA+= -Wno-address-of-packed-member
	.if ${COMPILER_VERSION} >= 130000
	-CWARNFLAGS+= -Wno-error=unused-but-set-variable
	+.if ${MK_SET_BUT_NOTUSED_KERNEL_WARNINGS} == "no"
	+CWARNEXTRA+= ${NO_WUNUSED_BUT_SET_VARIABLE}
	+.else
	+CWARNEXTRA+= -Wno-error=unused-but-set-variable
	+.endif
	.endif
	.endif # clang

	diff --git a/sys/conf/kern.opts.mk b/sys/conf/kern.opts.mk
	--- a/sys/conf/kern.opts.mk
	+++ b/sys/conf/kern.opts.mk
	@@ -60,7 +60,8 @@
	INIT_ALL_ZERO \
	KERNEL_RETPOLINE \
	RATELIMIT \
	- REPRODUCIBLE_BUILD
	+ REPRODUCIBLE_BUILD \
	+ SET_BUT_NOTUSED_KERNEL_WARNINGS

	# Some options are totally broken on some architectures. We disable
	# them. If you need to enable them on an experimental basis, you