build: fix library versioning

Building the library using the -release option with the package version
as the library version results in a non binary compatible library,
forcing users to recompile their application against newer versions of
libzbc, even if no interface or ABI change is introduced.

Fix this by using the -version-info option with a version number
correctly using the current:release:age definition, calculated from the
package major and minor version numbers.

Signed-off-by: Damien Le Moal <[email protected]>

Author: damien-lemoal

configure.ac

@@ -7,6 +7,22 @@
 AC_INIT([libzbc], [5.11.0],
 	[[email protected], [email protected]],
 	[libzbc], [https://github.com/westerndigitalcorporation/libzbc])
+
+# Package version details: <major>.<minor>.<release>
+PACKAGE_VERSION_MAJOR=$(echo $PACKAGE_VERSION | awk -F. '{print $1}')
+PACKAGE_VERSION_MINOR=$(echo $PACKAGE_VERSION | awk -F. '{print $2}')
+PACKAGE_VERSION_RELEASE=$(echo $PACKAGE_VERSION | awk -F. '{print $3}')
+
+# libzbc library version
+LIBZBC_VERSION="$PACKAGE_VERSION_MAJOR.$PACKAGE_VERSION_MINOR.$PACKAGE_VERSION_RELEASE"
+LIBZBC_LT_MAJOR=$PACKAGE_VERSION_MAJOR
+LIBZBC_LT_MINOR=$PACKAGE_VERSION_MINOR
+LIBZBC_LT_RELEASE=0
+LIBZBC_VERSION_INFO=$(( LIBZBC_LT_MAJOR + LIBZBC_LT_MINOR )):$LIBZBC_LT_RELEASE:$LIBZBC_LT_MINOR
+
+AC_SUBST([LIBZBC_VERSION])
+AC_SUBST([LIBZBC_VERSION_INFO])
+
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADER([include/config.h])

lib/Makefile.am

@@ -38,4 +38,4 @@ libzbc_la_SOURCES = $(CFILES) $(HFILES)
 libzbc_la_CFLAGS = $(AM_CFLAGS) -fPIC
 libzbc_la_LDFLAGS = \
         -Wl,--version-script,${srcdir}/exports \
-	-release '$(PACKAGE_VERSION)'
+	-version-info @LIBZBC_VERSION_INFO@

lib/libzbc.pc.in

@@ -10,7 +10,7 @@ includedir=@includedir@
 
 Name:           libzbc
 Description:    A library for accessing and managing ZBC/ZAC devices
-Version:        @PACKAGE_VERSION@
+Version:        @LIBZBC_VERSION@
 Cflags:         -I${includedir}
 Libs:           -L${libdir} -lzbc
 

libzbc.spec

@@ -55,6 +55,7 @@ find $RPM_BUILD_ROOT -name '*.la' -delete
 
 %files
 %{_libdir}/*.so
+%{_libdir}/*.so.*
 %{_bindir}/*
 %{_mandir}/man8/*
 %exclude %{_libdir}/pkgconfig