Index: external/gpl3/gcc/dist/libobjc/encoding.c
===================================================================
RCS file: /cvsroot/src/external/gpl3/gcc/dist/libobjc/encoding.c,v
retrieving revision 1.10
diff -u -u -r1.10 encoding.c
--- external/gpl3/gcc/dist/libobjc/encoding.c	1 Oct 2019 10:38:22 -0000	1.10
+++ external/gpl3/gcc/dist/libobjc/encoding.c	15 Oct 2019 19:02:56 -0000
@@ -81,6 +81,7 @@
 #define DECL_MODE(TYPE) *(TYPE)
 #define TYPE_MODE(TYPE) *(TYPE)
 
+#undef DFmode
 #define DFmode          _C_DBL
 
 #define strip_array_types(TYPE)      ({const char *_field = (TYPE); \
Index: external/gpl3/gcc/lib/libasan/Makefile
===================================================================
RCS file: /cvsroot/src/external/gpl3/gcc/lib/libasan/Makefile,v
retrieving revision 1.30
diff -u -u -r1.30 Makefile
--- external/gpl3/gcc/lib/libasan/Makefile	13 Oct 2019 21:18:20 -0000	1.30
+++ external/gpl3/gcc/lib/libasan/Makefile	15 Oct 2019 19:02:56 -0000
@@ -56,3 +56,4 @@
 .endif
 
 .include <bsd.lib.mk>
+CXXFLAGS += -Wno-old-style-cast -Wno-non-virtual-dtor -Wno-ctor-dtor-privacy
Index: external/gpl3/gcc/lib/liblsan/Makefile
===================================================================
RCS file: /cvsroot/src/external/gpl3/gcc/lib/liblsan/Makefile,v
retrieving revision 1.5
diff -u -u -r1.5 Makefile
--- external/gpl3/gcc/lib/liblsan/Makefile	2 Oct 2019 02:54:34 -0000	1.5
+++ external/gpl3/gcc/lib/liblsan/Makefile	15 Oct 2019 19:02:56 -0000
@@ -25,3 +25,5 @@
 LIBDPLIBS+= rt ${NETBSDSRCDIR}/lib/librt
 
 .include <bsd.lib.mk>
+
+CXXFLAGS+=-Wno-old-style-cast -Wno-non-virtual-dtor
Index: external/gpl3/gcc/lib/libstdc++-v3/Makefile
===================================================================
RCS file: /cvsroot/src/external/gpl3/gcc/lib/libstdc++-v3/Makefile,v
retrieving revision 1.48
diff -u -u -r1.48 Makefile
--- external/gpl3/gcc/lib/libstdc++-v3/Makefile	30 Jul 2019 20:19:18 -0000	1.48
+++ external/gpl3/gcc/lib/libstdc++-v3/Makefile	15 Oct 2019 19:02:56 -0000
@@ -111,6 +111,7 @@
 COPTS.future.cc += -Wno-deprecated-declarations
 COPTS.shared_ptr.cc += -Wno-deprecated-declarations
 COPTS.thread.cc += -Wno-deprecated-declarations
+COPTS.cxx11-ios_failure.cc += -Wno-ctor-dtor-privacy -Wno-overloaded-virtual
 CPPFLAGS.strstream.cc += -I$(GLIBCPP_INCLUDE_DIR)/backward -Wno-deprecated
 
 CPPFLAGS.cp-demangle.cc += -DIN_GLIBCPP_V3
@@ -197,6 +198,8 @@
 	${.CURDIR}/arch/${LIBSTDCXX_MACHINE_ARCH}
 
 ${OBJS}: ${.CURDIR}/arch/${LIBSTDCXX_MACHINE_ARCH}/defs.mk
+CXXFLAGS+=	-Wno-old-style-cast
+
 
 .else
 .include <bsd.prog.mk> # do nothing
Index: external/gpl3/gcc/lib/libsupc++/Makefile
===================================================================
RCS file: /cvsroot/src/external/gpl3/gcc/lib/libsupc++/Makefile,v
retrieving revision 1.12
diff -u -u -r1.12 Makefile
--- external/gpl3/gcc/lib/libsupc++/Makefile	19 Jan 2019 17:11:02 -0000	1.12
+++ external/gpl3/gcc/lib/libsupc++/Makefile	15 Oct 2019 19:02:56 -0000
@@ -37,6 +37,9 @@
 	${.CURDIR}/../libstdc++-v3/arch/${GCC_MACHINE_ARCH}
 
 ${OBJS}: ${.CURDIR}/../libstdc++-v3/arch/${GCC_MACHINE_ARCH}/defs.mk
+
+CXXFLAGS += -Wno-old-style-cast
+
 .else
 .include <bsd.prog.mk> # do nothing
 .endif
Index: external/gpl3/gcc/lib/libubsan/Makefile
===================================================================
RCS file: /cvsroot/src/external/gpl3/gcc/lib/libubsan/Makefile,v
retrieving revision 1.15
diff -u -u -r1.15 Makefile
--- external/gpl3/gcc/lib/libubsan/Makefile	6 Oct 2019 00:15:22 -0000	1.15
+++ external/gpl3/gcc/lib/libubsan/Makefile	15 Oct 2019 19:02:56 -0000
@@ -31,3 +31,4 @@
 CPPFLAGS+=-DCAN_SANITIZE_UB=1
 
 .include <bsd.lib.mk>
+CXXFLAGS += -Wno-old-style-cast -Wno-non-virtual-dtor -Wno-ctor-dtor-privacy
Index: sys/arch/xen/xen/clock.c
===================================================================
RCS file: /cvsroot/src/sys/arch/xen/xen/clock.c,v
retrieving revision 1.78
diff -u -u -r1.78 clock.c
--- sys/arch/xen/xen/clock.c	9 Mar 2019 09:51:29 -0000	1.78
+++ sys/arch/xen/xen/clock.c	15 Oct 2019 19:03:00 -0000
@@ -764,7 +764,7 @@
 	    device_xname(ci->ci_dev));
 	/* XXX sketchy function pointer cast -- fix the API, please */
 	ci->ci_xen_timer_intrhand = xen_intr_establish_xname(-1, &xen_pic, evtch,
-	    IST_LEVEL, IPL_CLOCK, (int (*)(void *))xen_timer_handler, ci, true,
+	    IST_LEVEL, IPL_CLOCK, (int (*)(void *))(void *)xen_timer_handler, ci, true,
 	    intr_xname);
 	if (ci->ci_xen_timer_intrhand == NULL)
 		panic("failed to establish timer interrupt handler");
Index: sys/kern/kern_hook.c
===================================================================
RCS file: /cvsroot/src/sys/kern/kern_hook.c,v
retrieving revision 1.6
diff -u -u -r1.6 kern_hook.c
--- sys/kern/kern_hook.c	22 Nov 2013 21:04:11 -0000	1.6
+++ sys/kern/kern_hook.c	15 Oct 2019 19:03:01 -0000
@@ -102,7 +102,7 @@
 	struct hook_desc *hd;
 
 	LIST_FOREACH(hd, list, hk_list)
-		((void (*)(struct proc *, void *))*hd->hk_fn)(p, hd->hk_arg);
+		((void (*)(struct proc *, void *))(void *)*hd->hk_fn)(p, hd->hk_arg);
 }
 
 /*
@@ -201,7 +201,7 @@
 void *
 exechook_establish(void (*fn)(struct proc *, void *), void *arg)
 {
-	return hook_establish(&exechook_list, (void (*)(void *))fn, arg);
+	return hook_establish(&exechook_list, (void (*)(void *))(void *)fn, arg);
 }
 
 void
@@ -228,7 +228,7 @@
 	void *rv;
 
 	rw_enter(&exec_lock, RW_WRITER);
-	rv = hook_establish(&exithook_list, (void (*)(void *))fn, arg);
+	rv = hook_establish(&exithook_list, (void (*)(void *))(void *)fn, arg);
 	rw_exit(&exec_lock);
 	return rv;
 }
@@ -256,7 +256,7 @@
 void *
 forkhook_establish(void (*fn)(struct proc *, struct proc *))
 {
-	return hook_establish(&forkhook_list, (void (*)(void *))fn, NULL);
+	return hook_establish(&forkhook_list, (void (*)(void *))(void *)fn, NULL);
 }
 
 void
@@ -274,7 +274,7 @@
 	struct hook_desc *hd;
 
 	LIST_FOREACH(hd, &forkhook_list, hk_list) {
-		((void (*)(struct proc *, struct proc *))*hd->hk_fn)
+		((void (*)(struct proc *, struct proc *))(void *)*hd->hk_fn)
 		    (p2, p1);
 	}
 }
Index: sys/kern/subr_pool.c
===================================================================
RCS file: /cvsroot/src/sys/kern/subr_pool.c,v
retrieving revision 1.259
diff -u -u -r1.259 subr_pool.c
--- sys/kern/subr_pool.c	23 Sep 2019 05:39:59 -0000	1.259
+++ sys/kern/subr_pool.c	15 Oct 2019 19:03:01 -0000
@@ -2063,10 +2063,10 @@
 	mutex_init(&pc->pc_lock, MUTEX_DEFAULT, ipl);
 
 	if (ctor == NULL) {
-		ctor = (int (*)(void *, void *, int))nullop;
+		ctor = (int (*)(void *, void *, int))(void *)nullop;
 	}
 	if (dtor == NULL) {
-		dtor = (void (*)(void *, void *))nullop;
+		dtor = (void (*)(void *, void *))(void *)nullop;
 	}
 
 	pc->pc_emptygroups = NULL;
@@ -2339,7 +2339,7 @@
 		 * cache back to the global pool then wait for the xcall to
 		 * complete.
 		 */
-		where = xc_broadcast(0, (xcfunc_t)pool_cache_transfer,
+		where = xc_broadcast(0, (xcfunc_t)(void *)pool_cache_transfer,
 		    pc, NULL);
 		xc_wait(where);
 	}
Index: sys/kern/subr_vmem.c
===================================================================
RCS file: /cvsroot/src/sys/kern/subr_vmem.c,v
retrieving revision 1.97
diff -u -u -r1.97 subr_vmem.c
--- sys/kern/subr_vmem.c	8 Feb 2018 09:05:20 -0000	1.97
+++ sys/kern/subr_vmem.c	15 Oct 2019 19:03:01 -0000
@@ -769,8 +769,8 @@
 	}
 
 	if (vm->vm_flags & VM_XIMPORT) {
-		rc = ((vmem_ximport_t *)vm->vm_importfn)(vm->vm_arg, size,
-		    &size, flags, &addr);
+		rc = ((vmem_ximport_t *)(void *)vm->vm_importfn)(vm->vm_arg,
+		    size, &size, flags, &addr);
 	} else {
 		rc = (vm->vm_importfn)(vm->vm_arg, size, flags, &addr);
 	}
@@ -1005,7 +1005,7 @@
 	KASSERT((flags & (VM_XIMPORT)) == 0);
 
 	return vmem_init(NULL, name, base, size, quantum,
-	    (vmem_import_t *)importfn, releasefn, source,
+	    (vmem_import_t *)(void *)importfn, releasefn, source,
 	    qcache_max, flags | VM_XIMPORT, ipl);
 }
 
Index: sys/net/if_ethersubr.c
===================================================================
RCS file: /cvsroot/src/sys/net/if_ethersubr.c,v
retrieving revision 1.278
diff -u -u -r1.278 if_ethersubr.c
--- sys/net/if_ethersubr.c	2 Oct 2019 04:17:16 -0000	1.278
+++ sys/net/if_ethersubr.c	15 Oct 2019 19:03:01 -0000
@@ -1035,7 +1035,7 @@
 	 * is in the process of being detached. Return device not configured
 	 * instead.
 	 */
-	ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))enxio;
+	ifp->if_ioctl = (int (*)(struct ifnet *, u_long, void *))(void *)enxio;
 
 #if NBRIDGE > 0
 	if (ifp->if_bridge)