add --enable-sanitize config option

Change-Id: I8f641c4bce361dcef5d8c149b8b81b21f12cbadf

configure.ac

@@ -17,6 +17,18 @@ AC_CONFIG_MACRO_DIR([m4])
 
 PKG_CHECK_MODULES(LIBTALLOC, talloc)
 
+AC_ARG_ENABLE(sanitize,
+	[AS_HELP_STRING(
+		[--enable-sanitize],
+		[Compile with address sanitizer enabled],
+	)],
+	[sanitize=$enableval], [sanitize="no"])
+if test x"$sanitize" = x"yes"
+then
+	CFLAGS="$CFLAGS -fsanitize=address -fsanitize=undefined"
+	CPPFLAGS="$CPPFLAGS -fsanitize=address -fsanitize=undefined"
+fi
+
 # The following test is taken from WebKit's webkit.m4
 saved_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS -fvisibility=hidden "