libcgroup: FTBFS on ia64

Currently libcgroup FTBFS on ia64. This is a result of cgrulesengd.h
defining __USE_GNU itself after features.h has been included, and since
_GNU_SOURCE was not defined before features.h was included, this breaks
assumptions in the glibc headers about the implications of the different
__USE_FOO macros, eventually leading to siginfo-consts-arch.h being
included but TRAP_TRACE not having been defined (which is guarded by
__USE_XOPEN_EXTENDED). The attached patch fixes this on ia64, although
is untested elsewhere.

Bug-Debian: https://bugs.debian.org/886744
Last-Update: 2019-02-22


Gbp-Pq: Name cgrulesengd-_GNU_SOURCE.patch

src/daemon/cgrulesengd.c

@@ -31,6 +31,10 @@
  * TODO Stop using netlink for communication (or at least rewrite that part).
  */
 
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+
 #include "libcgroup.h"
 #include "cgrulesengd.h"
 #include "../libcgroup-internal.h"

src/daemon/cgrulesengd.h

@@ -15,8 +15,6 @@
 #ifndef _CGRULESENGD_H
 #define _CGRULESENGD_H
 
-#include <features.h>
-
 __BEGIN_DECLS
 
 #include "config.h"
@@ -24,14 +22,6 @@ __BEGIN_DECLS
 #include <linux/connector.h>
 #include <linux/cn_proc.h>
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
-#ifndef __USE_GNU
-#define __USE_GNU
-#endif
-
 /* The following ten macros are all for the Netlink code. */
 #define SEND_MESSAGE_LEN (NLMSG_LENGTH(sizeof(struct cn_msg) + \
 	sizeof(enum proc_cn_mcast_op)))