From 1c56f52223a8f3c078f0782d1fa2fbca5bf0bf15 Mon Sep 17 00:00:00 2001
From: Alan Ott <alan@signal11.us>
Date: Tue, 3 Jul 2012 22:35:51 -0400
Subject: [PATCH] Added library versioning.

---
 configure.ac        | 22 +++++++++++++++++++++-
 libusb/Makefile.am  |  4 ++--
 linux/Makefile.am   |  2 +-
 mac/Makefile.am     |  2 +-
 windows/Makefile.am |  2 +-
 5 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/configure.ac b/configure.ac
index 5b54d03..c1df3e4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,23 @@
 AC_PREREQ([2.65])
-AC_INIT([hidapi], [0.8], [alan@signal11.us])
+
+# Version number. This is currently the only place.
+m4_define([HIDAPI_MAJOR],   0)
+m4_define([HIDAPI_MINOR],   7)
+m4_define([HIDAPI_RELEASE], 0)
+m4_define([HIDAPI_RC],      +)
+m4_define([VERSION_STRING], HIDAPI_MAJOR[.]HIDAPI_MINOR[.]HIDAPI_RELEASE[]HIDAPI_RC)
+
+AC_INIT([hidapi], VERSION_STRING, [alan@signal11.us])
+
+# Library soname version
+# Follow the following rules (particularly the ones in the second link):
+#  http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
+#  http://sourceware.org/autobook/autobook/autobook_91.html
+lt_current="0"
+lt_revision="0"
+lt_age="0"
+LTLDFLAGS="-version-info ${lt_current}:${lt_revision}:${lt_age}"
+
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([foreign -Wall -Werror])
 AC_CONFIG_MACRO_DIR([m4])
@@ -145,5 +163,7 @@ else
 	AC_CONFIG_FILES([pc/hidapi.pc])
 fi
 
+AC_SUBST(LTLDFLAGS)
+
 AC_CONFIG_FILES([Makefile linux/Makefile libusb/Makefile mac/Makefile windows/Makefile hidtest/Makefile testgui/Makefile])
 AC_OUTPUT
diff --git a/libusb/Makefile.am b/libusb/Makefile.am
index 1845195..c821e38 100644
--- a/libusb/Makefile.am
+++ b/libusb/Makefile.am
@@ -3,14 +3,14 @@ AM_CPPFLAGS = -I$(srcdir)/../hidapi $(CFLAGS_LIBUSB)
 if OS_LINUX
 lib_LTLIBRARIES = libhidapi-libusb.la
 libhidapi_libusb_la_SOURCES = hid.c
-libhidapi_libusb_la_LDFLAGS = -version-info 0:0:0
+libhidapi_libusb_la_LDFLAGS = $(LTLDFLAGS)
 libhidapi_libusb_la_LIBADD = $(LIBS_LIBUSB)
 endif
 
 if OS_FREEBSD
 lib_LTLIBRARIES = libhidapi.la
 libhidapi_la_SOURCES = hid.c
-libhidapi_la_LDFLAGS = -version-info 0:0:0
+libhidapi_la_LDFLAGS = $(LTLDFLAGS)
 libhidapi_la_LIBADD = $(LIBS_LIBUSB)
 endif
 
diff --git a/linux/Makefile.am b/linux/Makefile.am
index 8192a40..4494710 100644
--- a/linux/Makefile.am
+++ b/linux/Makefile.am
@@ -1,6 +1,6 @@
 lib_LTLIBRARIES = libhidapi-hidraw.la
 libhidapi_hidraw_la_SOURCES = hid.c
-libhidapi_hidraw_la_LDFLAGS = -version-info 0:0:0
+libhidapi_hidraw_la_LDFLAGS = $(LTLDFLAGS)
 AM_CPPFLAGS = -I$(srcdir)/../hidapi/ $(CFLAGS_HIDRAW)
 libhidapi_hidraw_la_LIBADD = $(LIBS_HIDRAW)
 
diff --git a/mac/Makefile.am b/mac/Makefile.am
index cc04ca9..d80c460 100644
--- a/mac/Makefile.am
+++ b/mac/Makefile.am
@@ -1,6 +1,6 @@
 lib_LTLIBRARIES = libhidapi.la
 libhidapi_la_SOURCES = hid.c
-libhidapi_la_LDFLAGS = -version-info 0:0:0
+libhidapi_la_LDFLAGS = $(LTLDFLAGS)
 AM_CPPFLAGS = -I../hidapi/
 #libhidapi_la_LIBADD = $(LIBS_HIDRAW)
 
diff --git a/windows/Makefile.am b/windows/Makefile.am
index 861e743..025d595 100644
--- a/windows/Makefile.am
+++ b/windows/Makefile.am
@@ -1,6 +1,6 @@
 lib_LTLIBRARIES = libhidapi.la
 libhidapi_la_SOURCES = hid.c
-libhidapi_la_LDFLAGS = -version-info 0:0:0
+libhidapi_la_LDFLAGS = $(LTLDFLAGS)
 AM_CPPFLAGS = -I$(srcdir)/../hidapi/
 libhidapi_la_LIBADD = $(LIBS)