"Use of old GNU field designator" build failure(s) — clang 3.1

This piece of code is triggering a warning by clang on purpose while gcc does not complain. -Werror is failing the build.
struct Point { int x; }
p = { x: 10 };
PackageVersionSupposed error messageFull log Bug report
filtergen 0.12.4-5.1fg-iptables.c:338:2: error: use of GNU old-style field designator extension [-Werror,-Wgnu-designator] Log 751443
libappindicator 0.4.92-2app-indicator.c:199:2: error: use of GNU old-style field designator extension [-Werror,-Wgnu-designator] Log 751445
vzquota 3.0.12-3syscall.c:41:6: error: use of GNU old-style field designator extension [-Werror,-Wgnu-designator] Log 753065

3 errors