ebtables: build ipv6 extension only if needed

release/src-rt-6.x.4708/router/Makefile

@@ -1766,12 +1766,16 @@ wanuptime-install:
 	$(STRIP) $(INSTALLDIR)/wanuptime/usr/sbin/wanuptime
 
 ebtables/stamp-h1: dummy
+ifeq ($(TCONFIG_IPV6),y)
+	mv patches/ebtables/104-do-not-build-ipv6-extension.patch patches/ebtables/104-do-not-build-ipv6-extension.patch.tmp || true
+else
+	mv patches/ebtables/104-do-not-build-ipv6-extension.patch.tmp patches/ebtables/104-do-not-build-ipv6-extension.patch || true
+endif
 	$(call patch_files,ebtables)
-	cd $(TOP)/ebtables && CC=$(CC) LD=$(LD) STRIP=$(CROSS_COMPILE)strip \
-	./autogen.sh && \
+	cd $(TOP)/ebtables && ./autogen.sh && \
 	$(CONFIGURE) --prefix=/usr --bindir=/usr/sbin --sysconfdir=/etc --libdir=/usr/lib \
-	CFLAGS="-Os $(EXTRACFLAGS) -ffunction-sections -fdata-sections -Wl,--gc-sections" \
-	LDFLAGS="-ffunction-sections -fdata-sections -Wl,--gc-sections" \
+		CFLAGS="-Os $(EXTRACFLAGS) -ffunction-sections -fdata-sections" \
+		LDFLAGS="-ffunction-sections -fdata-sections -Wl,--gc-sections -fPIC" \
 		LOCKFILE="/var/lock/ebtables"
 	touch ebtables/stamp-h1
 

release/src-rt-6.x.4708/router/patches/ebtables/104-do-not-build-ipv6-extension.patch

@@ -0,0 +1,11 @@
+--- ebtables/Makefile.am
++++ ebtables/Makefile.am
+@@ -35,7 +35,7 @@ lib_LTLIBRARIES = libebtc.la
+ 	communication.c ebtables.c getethertype.c \
+ 	libebtc.c useful_functions.c \
+ 	extensions/ebt_arp.c \
+-	extensions/ebt_arpreply.c extensions/ebt_ip.c extensions/ebt_ip6.c \
++	extensions/ebt_arpreply.c extensions/ebt_ip.c \
+ 	extensions/ebt_limit.c extensions/ebt_log.c extensions/ebt_mark.c \
+ 	extensions/ebt_nat.c \
+ 	extensions/ebt_pkttype.c extensions/ebt_redirect.c \