From: Tony Ambardar <itugrok@yahoo.com>
Date: Sat, 24 Nov 2018 00:33:45 +0000 (-0800)
Subject: iproute2: simplify linking libelf for eBFP/XDP object file support
X-Git-Url: http://git.openwrt.org/?p=openwrt%2Fstaging%2Fmkresin.git;a=commitdiff_plain;h=26681fa6a6fcbec0024906eb8367e9a3160521fb

iproute2: simplify linking libelf for eBFP/XDP object file support

Simplify build and runtime dependencies on libelf, which allows tc and ip
to load BPF and XDP object files respectively.

Preserve optionality of libelf by having configuration script follow the
HAVE_ELF environment variable, used similarly to the HAVE_MNL variable.

Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
---

diff --git a/package/network/utils/iproute2/Makefile b/package/network/utils/iproute2/Makefile
index 56a16d095c..a9bcfd40a0 100644
--- a/package/network/utils/iproute2/Makefile
+++ b/package/network/utils/iproute2/Makefile
@@ -49,7 +49,7 @@ $(call Package/iproute2/Default)
  VARIANT:=full
  PROVIDES:=ip
  ALTERNATIVES:=300:/sbin/ip:/usr/libexec/ip-full
- DEPENDS:=+libnl-tiny +(PACKAGE_devlink||PACKAGE_rdma):libmnl
+ DEPENDS:=+libnl-tiny +libelf +(PACKAGE_devlink||PACKAGE_rdma):libmnl
 endef
 
 define Package/tc
@@ -100,6 +100,14 @@ ifeq ($(BUILD_VARIANT),tiny)
   IP_CONFIG_TINY:=y
 endif
 
+ifeq ($(BUILD_VARIANT),full)
+  HAVE_ELF:=y
+endif
+
+ifeq ($(BUILD_VARIANT),tc)
+  HAVE_ELF:=y
+endif
+
 ifdef CONFIG_PACKAGE_devlink
   HAVE_MNL:=y
 endif
@@ -121,6 +129,7 @@ MAKE_FLAGS += \
 	KERNEL_INCLUDE="$(LINUX_DIR)/user_headers/include" \
 	SHARED_LIBS="" \
 	IP_CONFIG_TINY=$(IP_CONFIG_TINY) \
+	HAVE_ELF=$(HAVE_ELF) \
 	HAVE_MNL=$(HAVE_MNL) \
 	IPT_LIB_DIR=/usr/lib/iptables \
 	XT_LIB_DIR=/usr/lib/iptables \
diff --git a/package/network/utils/iproute2/patches/145-keep_libelf_optional.patch b/package/network/utils/iproute2/patches/145-keep_libelf_optional.patch
new file mode 100644
index 0000000000..2e3ad18809
--- /dev/null
+++ b/package/network/utils/iproute2/patches/145-keep_libelf_optional.patch
@@ -0,0 +1,11 @@
+--- a/configure
++++ b/configure
+@@ -228,7 +228,7 @@ EOF
+ 
+ check_elf()
+ {
+-    if ${PKG_CONFIG} libelf --exists; then
++    if [ "${HAVE_ELF}" = "y" ] && ${PKG_CONFIG} libelf --exists; then
+ 	echo "HAVE_ELF:=y" >>$CONFIG
+ 	echo "yes"
+ 
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
deleted file mode 100644
index 31aacffba8..0000000000
--- a/package/network/utils/iproute2/patches/190-link-libelf-to-tc-only.patch
+++ /dev/null
@@ -1,60 +0,0 @@
---- a/configure
-+++ b/configure
-@@ -231,8 +231,9 @@ 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
-@@ -133,8 +133,8 @@ 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 $@ $^