Variable length array in structure won't be supported - Rebuild of the Debian archive with clang

"Variable length array in structure won't be supported" build failure(s) — clang 4.0.1

int returnAnInt(void) {
  return 42;
}

int main() {
  struct {
     char buf[returnAnIt()];
  } r;
}

Package	Version	Supposed error message	Full log
bird	1.6.3-3	netlink.c:888:10: error: fields must have a constant size: 'variable length array in structure' extension will never be supported	Log
libdc1394-22	2.2.5-1	[48] [49] [50] [51] [52] [53control.c:286:19: error: fields must have a constant size: 'variable length array in structure' extension will never be supported	Log
ndisc6	1.0.3-3	trace-tcp.c:57:11: error: fields must have a constant size: 'variable length array in structure' extension will never be supported	Log
pulseaudio	10.0-2	pulsecore/iochannel.c:358:17: error: fields must have a constant size: 'variable length array in structure' extension will never be supported	Log
rng-tools	2-unofficial-mt.14-1	rngd_linux.c:191:17: error: fields must have a constant size: 'variable length array in structure' extension will never be supported	Log
rng-tools5	5-1	rngd_linux.c:126:17: error: fields must have a constant size: 'variable length array in structure' extension will never be supported	Log
unscd	0.52-1	nscd.c:2446:9: error: fields must have a constant size: 'variable length array in structure' extension will never be supported	Log

7 errors