Add soname for libcomposefs

This starts at 1.0.0 to signal incompatibilty with all previous
(unstable) releases. At this point we strive to be ABI compat, and
update the soname micro for non-api changes, and the minor for api
additions.

Signed-off-by: Alexander Larsson <[email protected]>

configure.ac

@@ -4,11 +4,40 @@ AC_CONFIG_SRCDIR([tools/mkcomposefs.c])
 AC_CONFIG_HEADERS([config.h])
 AC_SYS_LARGEFILE
 
+# Library soname versioning:
+#
+# Note that this is different from the package version, as the package
+# version is more of a human-oriented version for the tools, and does
+# not encode library compatibility.
+#
+# Making releases:
+#  If library added functions or features:
+#   LIBCOMPOSEFS_VERSION_MICRO = 0;
+#   LIBCOMPOSEFS_VERSION_MINOR += 1;
+# else, if library code changes:
+#   LIBCOMPOSEFS_VERSION_MICRO += 1;
+#
+# Only touch LIBCOMPOSEFS_VERSION_MAJOR if breaking ABI.
+# (And never do that lightly)
+
+m4_define([LIBCOMPOSEFS_VERSION_MAJOR], [1])
+m4_define([LIBCOMPOSEFS_VERSION_MINOR], [0])
+m4_define([LIBCOMPOSEFS_VERSION_MICRO], [0])
+
 LT_PREREQ([2.2.6])
 LT_INIT()
 
 AM_INIT_AUTOMAKE([1.11.2 -Wno-portability foreign tar-ustar no-dist-gzip dist-xz subdir-objects])
 
+m4_define([lt_current], [m4_eval(LIBCOMPOSEFS_VERSION_MINOR + LIBCOMPOSEFS_VERSION_MAJOR)])
+m4_define([lt_revision], [LIBCOMPOSEFS_VERSION_MICRO])
+m4_define([lt_age], [LIBCOMPOSEFS_VERSION_MINOR])
+LT_VERSION_INFO="lt_current:lt_revision:lt_age"
+AC_SUBST(LT_VERSION_INFO)
+
+LIBCOMPOSEFS_RELEASE_ARGS="-version-info $LT_VERSION_INFO"
+AC_SUBST([LIBCOMPOSEFS_RELEASE_ARGS])
+
 AC_PROG_CC
 PKG_PROG_PKG_CONFIG
 m4_ifdef([PKG_INSTALLDIR], [PKG_INSTALLDIR], AC_SUBST([pkgconfigdir], ${libdir}/pkgconfig))

libcomposefs/Makefile-lib.am

@@ -19,4 +19,4 @@ libcomposefs_la_SOURCES = \
                         $(COMPOSEFSDIR)/lcfs-mount.h \
                         $(COMPOSEFSDIR)/xalloc-oversized.h
 libcomposefs_la_CFLAGS = $(WARN_CFLAGS) $(COMPOSEFS_HASH_CFLAGS) $(LCFS_DEP_CRYPTO_CFLAGS) $(HIDDEN_VISIBILITY_CFLAGS)
-libcomposefs_la_LIBADD = $(LCFS_DEP_CRYPTO_LIBS)
+libcomposefs_la_LIBADD = $(LCFS_DEP_CRYPTO_LIBS) $(LIBCOMPOSEFS_RELEASE_ARGS)