iproute2: reduce .ipk package size from ~100k down to ~60k

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39119 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/network/utils/iproute2/Makefile

@@ -69,10 +69,15 @@ ifdef CONFIG_USE_EGLIBC
   endif
 endif
 
+TARGET_CFLAGS += -ffunction-sections -fdata-sections
+
 MAKE_FLAGS += \
 	EXTRA_CCOPTS="$(TARGET_CFLAGS) -I../include -I$(STAGING_DIR)/usr/include/libnl-tiny" \
 	KERNEL_INCLUDE="$(LINUX_DIR)/include" \
-	FPIC="$(FPIC)"
+	SHARED_LIBS="" \
+	LDFLAGS="-Wl,--gc-sections" \
+	IP_CONFIG_TINY=y \
+	FPIC=""
 
 define Build/Compile
 	+$(MAKE_VARS) $(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR) $(MAKE_FLAGS)

package/network/utils/iproute2/patches/300-ip_tiny.patch

@@ -0,0 +1,115 @@
+--- a/ip/Makefile
++++ b/ip/Makefile
+@@ -15,6 +15,13 @@ ifeq ($(IP_CONFIG_SETNS),y)
+ 	CFLAGS += -DHAVE_SETNS
+ endif
+ 
++STATIC_SYM_FILTER:=
++ifeq ($(IP_CONFIG_TINY),y)
++  STATIC_SYM_FILTER:=iplink_can.c iplink_ipoib.c iplink_vxlan.c
++  CFLAGS += -DIPROUTE2_TINY
++endif
++STATIC_SYM_SOURCES:=$(filter-out $(STATIC_SYM_FILTER),$(wildcard *.c))
++
+ ALLOBJ=$(IPOBJ) $(RTMONOBJ)
+ SCRIPTS=ifcfg rtpr routel routef
+ TARGETS=ip rtmon
+@@ -43,7 +50,7 @@ else
+ 
+ ip: static-syms.o
+ static-syms.o: static-syms.h
+-static-syms.h: $(wildcard *.c)
++static-syms.h: $(STATIC_SYM_SOURCES)
+ 	files="$^" ; \
+ 	for s in `grep -B 3 '\<dlsym' $$files | sed -n '/snprintf/{s:.*"\([^"]*\)".*:\1:;s:%s::;p}'` ; do \
+ 		sed -n '/'$$s'[^ ]* =/{s:.* \([^ ]*'$$s'[^ ]*\) .*:extern char \1[] __attribute__((weak)); if (!strcmp(sym, "\1")) return \1;:;p}' $$files ; \
+--- a/ip/ip.c
++++ b/ip/ip.c
+@@ -66,29 +66,41 @@ static const struct cmd {
+ 	int (*func)(int argc, char **argv);
+ } cmds[] = {
+ 	{ "address", 	do_ipaddr },
++#ifndef IPROUTE2_TINY
+ 	{ "addrlabel",	do_ipaddrlabel },
++#endif
+ 	{ "maddress",	do_multiaddr },
+ 	{ "route",	do_iproute },
+ 	{ "rule",	do_iprule },
+ 	{ "neighbor",	do_ipneigh },
+ 	{ "neighbour",	do_ipneigh },
++#ifndef IPROUTE2_TINY
+ 	{ "ntable",	do_ipntable },
+ 	{ "ntbl",	do_ipntable },
++#endif
+ 	{ "link",	do_iplink },
++#ifndef IPROUTE2_TINY
+ 	{ "l2tp",	do_ipl2tp },
++#endif
+ 	{ "tunnel",	do_iptunnel },
+ 	{ "tunl",	do_iptunnel },
++#ifndef IPROUTE2_TINY
+ 	{ "tuntap",	do_iptuntap },
+ 	{ "tap",	do_iptuntap },
+ 	{ "token",	do_iptoken },
+ 	{ "tcpmetrics",	do_tcp_metrics },
+ 	{ "tcp_metrics",do_tcp_metrics },
++#endif
+ 	{ "monitor",	do_ipmonitor },
++#ifndef IPROUTE2_TINY
+ 	{ "xfrm",	do_xfrm },
++#endif
+ 	{ "mroute",	do_multiroute },
+ 	{ "mrule",	do_multirule },
+ 	{ "netns",	do_netns },
++#ifndef IPROUTE2_TINY
+ 	{ "netconf",	do_ipnetconf },
++#endif
+ 	{ "help",	do_help },
+ 	{ 0 }
+ };
+--- a/lib/utils.c
++++ b/lib/utils.c
+@@ -627,6 +627,7 @@ const char *rt_addr_n2a(int af, int len,
+ 	case AF_INET:
+ 	case AF_INET6:
+ 		return inet_ntop(af, addr, buf, buflen);
++#ifndef IPROUTE2_TINY
+ 	case AF_IPX:
+ 		return ipx_ntop(af, addr, buf, buflen);
+ 	case AF_DECnet:
+@@ -635,6 +636,7 @@ const char *rt_addr_n2a(int af, int len,
+ 		memcpy(dna.a_addr, addr, 2);
+ 		return dnet_ntop(af, &dna, buf, buflen);
+ 	}
++#endif
+ 	default:
+ 		return "???";
+ 	}
+@@ -710,6 +712,7 @@ const char *format_host(int af, int len,
+ 			case AF_INET6:
+ 				len = 16;
+ 				break;
++#ifndef IPROUTE2_TINY
+ 			case AF_IPX:
+ 				len = 10;
+ 				break;
+@@ -720,6 +723,7 @@ const char *format_host(int af, int len,
+ 				len = 2;
+ 				break;
+ #endif
++#endif
+ 			default: ;
+ 			}
+ 		}
+--- a/lib/Makefile
++++ b/lib/Makefile
+@@ -1,5 +1,9 @@
+ include ../Config
+ 
++ifeq ($(IP_CONFIG_TINY),y)
++  CFLAGS += -DIPROUTE2_TINY
++endif
++
+ CFLAGS += $(FPIC)
+ 
+ UTILOBJ=utils.o rt_names.o ll_types.o ll_proto.o ll_addr.o inet_proto.o