link: add support for libtool version-info and bump to 1.0.0

closes #68; thanks @ararslan and @babelouest

Signed-off-by: Hans Zandbelt <hans.zandbelt@openidc.com>

Author: zandbelt

ChangeLog

@@ -1,6 +1,7 @@
 03/25/2026
 - proto: use strncasecmp on content type when obtaining a token from POST; closes #72; thanks @roubert
 - code: correct strstr assignments to compile with glibc 2.43; closes #73; thanks @Saur2000
+- link: add support for libtool version-info and bump to 1.0.0; closes #68; thanks @ararslan and @babelouest
 
 02/03/2026
 - code: assign strstr to char instead of const char to compile with globc 2.43

Makefile.am

@@ -51,6 +51,8 @@ liboauth2_la_pkgconfig_DATA = liboauth2.pc
 liboauth2_la_CFLAGS = @CURL_CFLAGS@ @CJOSE_CFLAGS@ @PCRE2_CFLAGS@
 liboauth2_la_LIBADD = @CURL_LIBS@ @CJOSE_LIBS@ @PCRE2_LIBS@
 
+liboauth2_la_LDFLAGS = @LIBTOOL_EXTRA_FLAGS@
+
 liboauth2_la_SOURCES = \
 	src/version.c \
 	src/mem.c \
@@ -99,6 +101,7 @@ endif
 
 noinst_LTLIBRARIES = liboauth2_cache.la
 liboauth2_la_LIBADD += liboauth2_cache.la
+
 liboauth2_cache_la_SOURCES = src/cache.c
 liboauth2_cache_la_CPPFLAGS = $(AM_CPPFLAGS)
 liboauth2_cache_la_CFLAGS = @CURL_CFLAGS@ @CJOSE_CFLAGS@ @PCRE2_CFLAGS@
@@ -134,6 +137,7 @@ liboauth2_apache_la_pkgconfig_DATA = liboauth2_apache.pc
 liboauth2_apache_la_CPPFLAGS = $(AM_CPPFLAGS) -DHAVE_APACHE
 liboauth2_apache_la_CFLAGS = @APACHE_CFLAGS@ @PCRE2_CFLAGS@
 liboauth2_apache_la_LIBADD = liboauth2.la @APR_LIBS@ @JANSSON_LIBS@
+liboauth2_apache_la_LDFLAGS = @LIBTOOL_EXTRA_FLAGS@
 
 includesub_HEADERS += \
 	include/oauth2/apache.h
@@ -155,6 +159,7 @@ liboauth2_nginx_la_pkgconfig_DATA = liboauth2_nginx.pc
 liboauth2_nginx_la_CPPFLAGS = $(AM_CPPFLAGS) -DHAVE_NGINX
 liboauth2_nginx_la_CFLAGS = @NGINX_CFLAGS@ @PCRE2_CFLAGS@
 liboauth2_nginx_la_LIBADD = liboauth2.la @NGINX_LIBS@ @JANSSON_LIBS@
+liboauth2_nginx_la_LDFLAGS = @LIBTOOL_EXTRA_FLAGS@
 
 includesub_HEADERS += \
 	include/oauth2/nginx.h

configure.ac

@@ -9,6 +9,10 @@ AC_PROG_CC
 
 AX_CODE_COVERAGE
 
+LIBOAUTH2_LIBRARY_VERSION=1:0:0
+LIBTOOL_EXTRA_FLAGS="-version-info $LIBOAUTH2_LIBRARY_VERSION"
+AC_SUBST([LIBTOOL_EXTRA_FLAGS])
+
 PKG_CHECK_MODULES(OPENSSL, openssl)
 AC_SUBST(OPENSSL_CFLAGS)
 AC_SUBST(OPENSSL_LIBS)