[dpdk-dev] [PATCH] build: fix soname info for 19.11 compatiblity

[Bruce Richardson <bruce.richardson@intel.com>]

The soname for each stable ABI version should be just the ABI version major
number without the minor number. Unfortunately both major and minor were
used causing version 20.1 to be incompatible with 20.0.

This patch fixes the issue by switching from 2-part to 3-part ABI version
numbers so that we can keep 20.0 as soname and using the final digits to
identify the 20.x releases which are ABI compatible. This requires changes
to both make and meson builds to handle the three-digit version and shrink
it to 2-digit for soname.

Fixes: cba806e07d6f ("build: change ABI versioning to global")

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---

This patch contains an alternative fix to that implied by the previous patches:
http://patches.dpdk.org/patch/63726/
http://patches.dpdk.org/patch/63728/

---
 ABI_VERSION         | 2 +-
 drivers/meson.build | 4 ++--
 lib/meson.build     | 4 ++--
 mk/rte.lib.mk       | 5 ++++-
 4 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/ABI_VERSION b/ABI_VERSION
index 2e73f8d2a..fcc01369a 100644
--- a/ABI_VERSION
+++ b/ABI_VERSION
@@ -1 +1 @@
-20.1
+20.0.1
diff --git a/drivers/meson.build b/drivers/meson.build
index 72eec4608..5f1d72071 100644
--- a/drivers/meson.build
+++ b/drivers/meson.build
@@ -132,11 +132,11 @@ foreach class:dpdk_driver_classes
 
 			if is_experimental != 0
 				lib_version = experimental_abi_version
-				so_version = experimental_abi_version
 			else
 				lib_version = abi_version
-				so_version = abi_version
 			endif
+			so_version = lib_version.split('.')
+			so_version = so_version[0] + '.' + so_version[1]
 
 			# now build the static driver
 			static_lib = static_library(lib_name,
diff --git a/lib/meson.build b/lib/meson.build
index 6ceb5e756..3b7dad348 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -113,11 +113,11 @@ foreach l:libraries
 
 			if is_experimental != 0
 				lib_version = experimental_abi_version
-				so_version = experimental_abi_version
 			else
 				lib_version = abi_version
-				so_version = abi_version
 			endif
+			so_version = lib_version.split('.')
+			so_version = so_version[0] + '.' + so_version[1]
 
 			# first build static lib
 			static_lib = static_library(libname,
diff --git a/mk/rte.lib.mk b/mk/rte.lib.mk
index 655a1b143..4b4267021 100644
--- a/mk/rte.lib.mk
+++ b/mk/rte.lib.mk
@@ -19,6 +19,8 @@ LIBABIVER := 0.$(shell cat $(RTE_SRCDIR)/ABI_VERSION | tr -d '.')
 endif
 
 ifeq ($(CONFIG_RTE_BUILD_SHARED_LIB),y)
+SOVER := $(basename $(LIBABIVER))
+SONAME := $(patsubst %.a,%.so.$(SOVER),$(LIB))
 LIB := $(patsubst %.a,%.so.$(LIBABIVER),$(LIB))
 ifeq ($(EXTLIB_BUILD),n)
 CPU_LDFLAGS += --version-script=$(SRCDIR)/$(EXPORT_MAP)
@@ -74,7 +76,7 @@ NO_UNDEFINED := -z defs
 endif
 
 O_TO_S = $(LD) -L$(RTE_SDK_BIN)/lib $(_CPU_LDFLAGS) $(EXTRA_LDFLAGS) \
-	  -shared $(OBJS-y) $(NO_UNDEFINED) $(LDLIBS) -Wl,-soname,$(LIB) -o $(LIB)
+	  -shared $(OBJS-y) $(NO_UNDEFINED) $(LDLIBS) -Wl,-soname,$(SONAME) -o $(LIB)
 O_TO_S_STR = $(subst ','\'',$(O_TO_S)) #'# fix syntax highlight
 O_TO_S_DISP = $(if $(V),"$(O_TO_S_STR)","  LD $(@)")
 O_TO_S_DO = @set -e; \
@@ -133,6 +135,7 @@ $(RTE_OUTPUT)/lib/$(LIB): $(LIB)
 	$(Q)cp -f $(LIB) $(RTE_OUTPUT)/lib
 ifeq ($(CONFIG_RTE_BUILD_SHARED_LIB),y)
 	$(Q)ln -s -f $< $(shell echo $@ | sed 's/\.so.*/.so/')
+	$(Q)ln -s -f $< $(shell echo $@ | sed 's/\.so.*/.so.$(SOVER)/')
 endif
 
 #
-- 
2.23.0