Build in std=c99 mode
Our current travis environment still uses gcc 4.8.4 which defaults to
std=gnu90. Some of tinycrypt's code requires c99.
@@ -83,6 +83,11 @@ fn main() {
conf.flag("-Wall");
conf.flag("-Werror");
+ // FIXME: travis-ci still uses gcc 4.8.4 which defaults to std=gnu90.
+ // It has incomplete std=c11 and std=c99 support but std=c99 was checked
+ // to build correctly so leaving it here to updated in the future...
+ conf.flag("-std=c99");
+
conf.compile("libbootutil.a");
walk_dir("../../boot").unwrap();
