iproute2: only link libelf where needed

The iproute2 build system links libelf support to every utility while only
the tc program actually requires libelf specific functionality.

Unfortunately the BPF ELF functionality is not confined into an own
compilation unit but added to the existing bpf.c sources of the shared
static libutil.a, causing every iproute2 applet to pick up an implicit
libelf.so dependency.

In order to avoid this requirement, patch the iproute2 build system to
create both a libutil.a and a libutil-elf.a, with the former being built
without libelf functionality and to only link the tc applet with the libelf
enabled libutil.

Finally, make the tc package depend on libelf to solve compilation errors.

Ref: https://github.com/openwrt/packages/issues/7728
Fixes: FS#2011
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

2 files changed, 62 insertions, 2 deletions

diff --git a/package/network/utils/iproute2/Makefile b/package/network/utils/iproute2/Makefile
index 6d3305b5ad..5e0f19a644 100644
--- a/package/network/utils/iproute2/Makefile
+++ b/package/network/utils/iproute2/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=iproute2
 PKG_VERSION:=4.19.0
-PKG_RELEASE:=6
+PKG_RELEASE:=7
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@KERNEL/linux/utils/net/iproute2
@@ -53,7 +53,7 @@ endef
 define Package/tc
 $(call Package/iproute2/Default)
   TITLE:=Traffic control utility
-  DEPENDS:=+kmod-sched-core +(PACKAGE_devlink||PACKAGE_rdma):libmnl
+  DEPENDS:=+kmod-sched-core +(PACKAGE_devlink||PACKAGE_rdma):libmnl +libelf1
 endef
 
 define Package/genl
diff --git a/package/network/utils/iproute2/patches/190-link-libelf-to-tc-only.patch b/package/network/utils/iproute2/patches/190-link-libelf-to-tc-only.patch
new file mode 100644
index 0000000000..1c44616253
--- /dev/null
+++ b/package/network/utils/iproute2/patches/190-link-libelf-to-tc-only.patch
@@ -0,0 +1,60 @@
+--- a/configure
++++ b/configure
+@@ -257,8 +257,9 @@ check_elf()
+ 	echo "HAVE_ELF:=y" >>$CONFIG
+ 	echo "yes"
+ 
+-	echo 'CFLAGS += -DHAVE_ELF' `${PKG_CONFIG} libelf --cflags` >> $CONFIG
+-	echo 'LDLIBS += ' `${PKG_CONFIG} libelf --libs` >>$CONFIG
++	echo 'CFLAGS += -DHAVE_ELF' >> $CONFIG
++	echo 'ELF_CFLAGS += ' `${PKG_CONFIG} libelf --cflags` >> $CONFIG
++	echo 'ELF_LDLIBS += ' `${PKG_CONFIG} libelf --libs` >>$CONFIG
+     else
+ 	echo "no"
+     fi
+--- a/lib/Makefile
++++ b/lib/Makefile
+@@ -11,9 +11,17 @@ UTILOBJ = utils.o rt_names.o ll_map.o ll
+ 	inet_proto.o namespace.o json_writer.o json_print.o \
+ 	names.o color.o bpf.o exec.o fs.o
+ 
++ELFOBJ=$(patsubst %.o,%.elf.o,$(UTILOBJ))
++
+ NLOBJ=libgenl.o libnetlink.o
+ 
+-all: libnetlink.a libutil.a
++all: libnetlink.a libutil.a libutil-elf.a
++
++%.o: %.c
++	$(QUIET_CC)$(CC) $(CFLAGS) -UHAVE_ELF $(EXTRA_CFLAGS) -c -o $@ $<
++
++%.elf.o: %.c
++	$(QUIET_CC)$(CC) $(CFLAGS) $(ELF_CFLAGS) $(EXTRA_CFLAGS) -c -o $@ $<
+ 
+ libnetlink.a: $(NLOBJ)
+ 	$(QUIET_AR)$(AR) rcs $@ $^
+@@ -21,7 +29,10 @@ libnetlink.a: $(NLOBJ)
+ libutil.a: $(UTILOBJ) $(ADDLIB)
+ 	$(QUIET_AR)$(AR) rcs $@ $^
+ 
++libutil-elf.a: $(ELFOBJ) $(ADDLIB)
++	$(QUIET_AR)$(AR) rcs $@ $^
++
+ install:
+ 
+ clean:
+-	rm -f $(NLOBJ) $(UTILOBJ) $(ADDLIB) libnetlink.a libutil.a
++	rm -f $(NLOBJ) $(UTILOBJ) $(ELFOBJ) $(ADDLIB) libnetlink.a libutil.a libutil-elf.a
+--- a/tc/Makefile
++++ b/tc/Makefile
+@@ -132,8 +132,8 @@ MODDESTDIR := $(DESTDIR)$(LIBDIR)/tc
+ 
+ all: tc $(TCSO)
+ 
+-tc: $(TCOBJ) $(LIBNETLINK) libtc.a
+-	$(QUIET_LINK)$(CC) $^ $(LDFLAGS) $(LDLIBS) -o $@
++tc: $(TCOBJ) $(subst libutil.a,libutil-elf.a,$(LIBNETLINK)) libtc.a
++	$(QUIET_LINK)$(CC) $^ $(LDFLAGS) $(LDLIBS) $(ELF_LDLIBS) -o $@
+ 
+ libtc.a: $(TCLIB)
+ 	$(QUIET_AR)$(AR) rcs $@ $^