Index: head/sys/conf/files.amd64
===================================================================
--- head/sys/conf/files.amd64
+++ head/sys/conf/files.amd64
@@ -34,7 +34,7 @@
 #
 linux32_genassym.o		optional	compat_linux32		\
 	dependency 	"$S/amd64/linux32/linux32_genassym.c"		\
-	compile-with	"${CC} ${CFLAGS:N-fno-common} -c ${.IMPSRC}"	\
+	compile-with	"${CC} ${CFLAGS:N-flto:N-fno-common} -c ${.IMPSRC}" \
 	no-obj no-implicit-rule						\
 	clean		"linux32_genassym.o"
 #
@@ -58,7 +58,7 @@
 #
 ia32_genassym.o			standard				\
 	dependency 	"$S/compat/ia32/ia32_genassym.c"		\
-	compile-with	"${CC} ${CFLAGS:N-fno-common} -c ${.IMPSRC}"	\
+	compile-with	"${CC} ${CFLAGS:N-flto:N-fno-common} -c ${.IMPSRC}" \
 	no-obj no-implicit-rule						\
 	clean		"ia32_genassym.o"
 #
Index: head/sys/conf/files.i386
===================================================================
--- head/sys/conf/files.i386
+++ head/sys/conf/files.i386
@@ -21,7 +21,7 @@
 #
 linux_genassym.o		optional	compat_linux		\
 	dependency 	"$S/i386/linux/linux_genassym.c"		\
-	compile-with	"${CC} ${CFLAGS:N-fno-common} -c ${.IMPSRC}"	\
+	compile-with	"${CC} ${CFLAGS:N-flto:N-fno-common} -c ${.IMPSRC}" \
 	no-obj no-implicit-rule						\
 	clean		"linux_genassym.o"
 #
@@ -45,7 +45,7 @@
 #
 svr4_genassym.o			optional	compat_svr4		\
 	dependency 	"$S/i386/svr4/svr4_genassym.c"			\
-	compile-with	"${CC} ${CFLAGS:N-fno-common} -c ${.IMPSRC}"	\
+	compile-with	"${CC} ${CFLAGS:N-flto:N-fno-common} -c ${.IMPSRC}" \
 	no-obj no-implicit-rule						\
 	clean		"svr4_genassym.o"
 #
Index: head/sys/conf/kern.post.mk
===================================================================
--- head/sys/conf/kern.post.mk
+++ head/sys/conf/kern.post.mk
@@ -189,7 +189,7 @@
 	NM='${NM}' NMFLAGS='${NMFLAGS}' sh $S/kern/genassym.sh genassym.o > ${.TARGET}
 
 genassym.o: $S/$M/$M/genassym.c
-	${CC} -c ${CFLAGS:N-fno-common} $S/$M/$M/genassym.c
+	${CC} -c ${CFLAGS:N-flto:N-fno-common} $S/$M/$M/genassym.c
 
 ${SYSTEM_OBJS} genassym.o vers.o: opt_global.h
 
Index: head/sys/conf/kmod.mk
===================================================================
--- head/sys/conf/kmod.mk
+++ head/sys/conf/kmod.mk
@@ -461,7 +461,7 @@
 	sh ${SYSDIR}/kern/genassym.sh genassym.o > ${.TARGET}
 genassym.o: ${SYSDIR}/${MACHINE}/${MACHINE}/genassym.c
 genassym.o: ${SRCS:Mopt_*.h}
-	${CC} -c ${CFLAGS:N-fno-common} \
+	${CC} -c ${CFLAGS:N-flto:N-fno-common} \
 	    ${SYSDIR}/${MACHINE}/${MACHINE}/genassym.c
 .endif
 
Index: head/sys/modules/linux/Makefile
===================================================================
--- head/sys/modules/linux/Makefile
+++ head/sys/modules/linux/Makefile
@@ -71,7 +71,7 @@
 .endif
 
 linux${SFX}_genassym.o:
-	${CC} -c ${CFLAGS:N-fno-common} ${.IMPSRC}
+	${CC} -c ${CFLAGS:N-flto:N-fno-common} ${.IMPSRC}
 
 .if !defined(KERNBUILDDIR)
 .if defined(KTR)
Index: head/sys/modules/linux64/Makefile
===================================================================
--- head/sys/modules/linux64/Makefile
+++ head/sys/modules/linux64/Makefile
@@ -44,7 +44,7 @@
 	    ${.IMPSRC} -o ${.TARGET}
 
 linux_genassym.o:
-	${CC} -c ${CFLAGS:N-fno-common} ${.IMPSRC}
+	${CC} -c ${CFLAGS:N-flto:N-fno-common} ${.IMPSRC}
 
 .if !defined(KERNBUILDDIR)
 .if defined(DEBUG)
Index: head/sys/modules/svr4/Makefile
===================================================================
--- head/sys/modules/svr4/Makefile
+++ head/sys/modules/svr4/Makefile
@@ -22,7 +22,7 @@
 		${.IMPSRC} -o ${.TARGET}
 
 svr4_genassym.o: svr4_genassym.c svr4.h
-	${CC} -c ${CFLAGS:N-fno-common} ${.IMPSRC}
+	${CC} -c ${CFLAGS:N-flto:N-fno-common} ${.IMPSRC}
 
 .if !defined(KERNBUILDDIR) && defined(DEBUG)
 opt_svr4.h:
Index: head/sys/modules/vmm/Makefile
===================================================================
--- head/sys/modules/vmm/Makefile
+++ head/sys/modules/vmm/Makefile
@@ -71,9 +71,9 @@
 	    ${.IMPSRC} -o ${.TARGET}
 
 vmx_genassym.o:
-	${CC} -c ${CFLAGS:N-fno-common} ${.IMPSRC}
+	${CC} -c ${CFLAGS:N-flto:N-fno-common} ${.IMPSRC}
 
 svm_genassym.o:
-	${CC} -c ${CFLAGS:N-fno-common} ${.IMPSRC}
+	${CC} -c ${CFLAGS:N-flto:N-fno-common} ${.IMPSRC}
 
 .include <bsd.kmod.mk>