Core: add an header file for backward compatibility

* lasso/backward_comp.h:
   this header will contain substitue function, defines or types for
   compatibility with older versions of dependencies.
 * lasso/utils.h:
   remove declaration of g_strcmp0
 * lasso.c:
 * tests/login_tests.c:
   use backward_comp.h

lasso/backward_comp.h

@@ -0,0 +1,48 @@
+/* $Id$
+ *
+ * Lasso - A free implementation of the Liberty Alliance specifications.
+ *
+ * Copyright (C) 2004-2007 Entr'ouvert
+ * http://lasso.entrouvert.org
+ *
+ * Authors: See AUTHORS file in top-level directory.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef BACKWARD_COMP_H
+
+/** This file contains re-implementations of functions which only exists in recent version of our
+ * dependencies, like GLib, OpenSSL or libxml.
+ */
+
+/* GLIB backward-compatibility */
+#if (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION < 16)
+static inline int g_strcmp0(const char *str1, const char *str2) {
+	if (str1 == NULL && str2 == NULL) {
+		return 0;
+	}
+	if (str1 == NULL) {
+		return -1;
+	}
+	if (str2 == NULL) {
+		return 1;
+	}
+	return strcmp(str1, str2);
+}
+#endif
+
+#endif

lasso/lasso.c

@@ -37,6 +37,7 @@
 #include <config.h>
 #include "lasso.h"
 #include "debug.h"
+#include "./backward_comp.h"
 
 /* Set to true, it forces lasso_provider_verify_signature and lasso_query_verify_signature to always
  * return TRUE. */
@@ -78,21 +79,6 @@ DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 }
 #endif
 
-#if (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION < 16)
-static int g_strcmp0(const char *str1, const char *str2) {
-	if (str1 == NULL && str2 == NULL) {
-		return 0;
-	}
-	if (str1 == NULL) {
-		return -1;
-	}
-	if (str2 == NULL) {
-		return 1;
-	}
-	return strcmp(str1, str2);
-}
-#endif
-
 #include "types.c"
 
 /**

lasso/utils.h

@@ -372,11 +372,4 @@
 /* Get a printable extract for error messages */
 char* lasso_safe_prefix_string(const char *str, gsize length);
 
-/* GLIB bacward-compatibility */
-#if (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION < 16)
-int     g_strcmp0                       (const char     *str1,
-                                         const char     *str2);
-#endif
-
-
 #endif /* __LASSO_UTILS_H__ */

tests/login_tests.c

@@ -29,6 +29,7 @@
 #include <lasso/lasso.h>
 #include <glib.h>
 #include "utils.h"
+#include "../lasso/backward_comp.h"
 
 
 static char*