[dpdk-dev] [PATCH v3] mk: fix compile error and ABI versioning for combined shared library

[Ferruh Yigit <ferruh.yigit@intel.com>]

Fixes following error (observed when versioning macros used):
  LD libdpdk.so
  /usr/bin/ld: /root/dpdk/build/lib/libdpdk.so: version node not found
  for symbol <function>@DPDK_x.y

Also resulting combined library contains symbol version information:
$ readelf -a build/lib/libdpdk.so | grep rte_eal_ | grep @ | head
   <...>    GLOBAL DEFAULT   12 rte_eal_alarm_set@@DPDK_2.0
   <...>    GLOBAL DEFAULT   12 rte_eal_pci_write_config@@DPDK_2.1
   <...>    GLOBAL DEFAULT   12 rte_eal_remote_launch@@DPDK_2.0
...

Versioning fixed by merging all version scripts into one automatically and
feeding it to final library.

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
---
 drivers/net/Makefile  |  3 +++
 lib/Makefile          |  3 +++
 mk/rte.sdkbuild.mk    |  2 +-
 mk/rte.sharelib.mk    |  3 +++
 scripts/merge_maps.sh | 29 +++++++++++++++++++++++++++++
 5 files changed, 39 insertions(+), 1 deletion(-)
 create mode 100755 scripts/merge_maps.sh

diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index cddcd57..d3c865b 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -51,5 +51,8 @@ DIRS-$(CONFIG_RTE_LIBRTE_VIRTIO_PMD) += virtio
 DIRS-$(CONFIG_RTE_LIBRTE_VMXNET3_PMD) += vmxnet3
 DIRS-$(CONFIG_RTE_LIBRTE_PMD_XENVIRT) += xenvirt
 
+ifeq ($(COMBINED_BUILD),1)
 include $(RTE_SDK)/mk/rte.sharelib.mk
+endif
+
 include $(RTE_SDK)/mk/rte.subdir.mk
diff --git a/lib/Makefile b/lib/Makefile
index ef172ea..d0f7fb8 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -64,5 +64,8 @@ DIRS-$(CONFIG_RTE_LIBRTE_KNI) += librte_kni
 DIRS-$(CONFIG_RTE_LIBRTE_IVSHMEM) += librte_ivshmem
 endif
 
+ifeq ($(COMBINED_BUILD),1)
 include $(RTE_SDK)/mk/rte.sharelib.mk
+endif
+
 include $(RTE_SDK)/mk/rte.subdir.mk
diff --git a/mk/rte.sdkbuild.mk b/mk/rte.sdkbuild.mk
index 38ec7bd..d4e3abf 100644
--- a/mk/rte.sdkbuild.mk
+++ b/mk/rte.sdkbuild.mk
@@ -94,7 +94,7 @@ $(ROOTDIRS-y):
 	@echo "== Build $@"
 	$(Q)$(MAKE) S=$@ -f $(RTE_SRCDIR)/$@/Makefile -C $(BUILDDIR)/$@ all
 	@if [ $@ = drivers -a $(CONFIG_RTE_BUILD_COMBINE_LIBS) = y ]; then \
-		$(MAKE) -f $(RTE_SDK)/lib/Makefile sharelib; \
+		COMBINED_BUILD=1 $(MAKE) -f $(RTE_SDK)/lib/Makefile sharelib; \
 	fi
 
 %_clean:
diff --git a/mk/rte.sharelib.mk b/mk/rte.sharelib.mk
index 7bb7219..76ead09 100644
--- a/mk/rte.sharelib.mk
+++ b/mk/rte.sharelib.mk
@@ -40,6 +40,8 @@ LIB_ONE := lib$(RTE_LIBNAME).so
 else
 LIB_ONE := lib$(RTE_LIBNAME).a
 endif
+COMBINED_MAP=$(BUILDDIR)/lib/libdpdk.map
+CPU_LDFLAGS += --version-script=$(COMBINED_MAP)
 endif
 
 .PHONY:sharelib
@@ -79,6 +81,7 @@ ifeq ($(CONFIG_RTE_BUILD_COMBINE_LIBS),y)
 ifeq ($(CONFIG_RTE_BUILD_SHARED_LIB),y)
 $(LIB_ONE): FORCE
 	@[ -d $(dir $@) ] || mkdir -p $(dir $@)
+	@$(SRCDIR)/scripts/merge_maps.sh > $(COMBINED_MAP)
 	$(O_TO_S_DO)
 else
 $(LIB_ONE): FORCE
diff --git a/scripts/merge_maps.sh b/scripts/merge_maps.sh
new file mode 100755
index 0000000..4ace975
--- /dev/null
+++ b/scripts/merge_maps.sh
@@ -0,0 +1,29 @@
+#!/bin/sh
+
+FILES=$(find $RTE_SDK -name "*_version.map")
+SYMBOLS=$(grep -h "{" $FILES | sort -u | sed 's/{//')
+
+first=0
+prev_sym="none"
+
+for s in $SYMBOLS; do
+	echo "$s {"
+	echo "    global:"
+	echo ""
+	for f in $FILES; do
+		sed -n "/$s {/,/}/p" $f | sed '/^$/d' | grep -v global | grep -v local | sed '1d' | sed '$d'
+	done | sort -u
+	echo ""
+	if [ $first -eq 0 ]; then
+		first=1;
+		echo "    local: *;";
+	fi
+	if [ "$prev_sym" == "none" ]; then
+		echo "};";
+		prev_sym=$s;
+	else
+		echo "} $prev_sym;";
+		prev_sym=$s;
+	fi
+	echo ""
+done
-- 
2.5.0