Index: head/sys/conf/kern.pre.mk
===================================================================
--- head/sys/conf/kern.pre.mk
+++ head/sys/conf/kern.pre.mk
@@ -114,6 +114,10 @@
 # can override the others.
 CFLAGS+=	${CONF_CFLAGS}
 
+.if ${LINKER_TYPE} != "bfd" || ${LINKER_VERSION} > 21750
+LDFLAGS+=	-Wl,--build-id=sha1
+.endif
+
 # Optional linting. This can be overridden in /etc/make.conf.
 LINTFLAGS=	${LINTOBJKERNFLAGS}
 
Index: head/sys/conf/kmod.mk
===================================================================
--- head/sys/conf/kmod.mk
+++ head/sys/conf/kmod.mk
@@ -125,6 +125,10 @@
 CFLAGS+=	-fno-common
 LDFLAGS+=	-d -warn-common
 
+.if ${LINKER_TYPE} != "bfd" || ${LINKER_VERSION} > 21750
+LDFLAGS+=	-Wl,--build-id=sha1
+.endif
+
 CFLAGS+=	${DEBUG_FLAGS}
 .if ${MACHINE_CPUARCH} == amd64
 CFLAGS+=	-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer