Move feature macro before "config.h" include

This allows to use header includes in "config.h" to reduce the build
configuration checks.

Update #3818.

cpukit/libmisc/shell/hexdump-conv.c

@@ -31,6 +31,10 @@
  * SUCH DAMAGE.
  */
 
+#ifdef __rtems__
+/* For wcwidth() visibility */
+#define _GNU_SOURCE
+#endif /* __rtems__ */
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -39,9 +43,6 @@
 #ifndef lint
 static const char sccsid[] = "@(#)conv.c	8.1 (Berkeley) 6/6/93";
 #endif /* not lint */
-#else /* __rtems__ */
-/* For wcwidth() visibility */
-#define _GNU_SOURCE
 #endif /* __rtems__ */
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD: src/usr.bin/hexdump/conv.c,v 1.9 2006/07/31 14:17:04 jkoshy Exp $");

cpukit/libmisc/shell/hexdump-odsyntax.c

@@ -31,6 +31,10 @@
  * SUCH DAMAGE.
  */
 
+#ifdef __rtems__
+/* For asprintf() visibility */
+#define _GNU_SOURCE
+#endif /* __rtems__ */
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -39,10 +43,6 @@
 #if 0
 static char sccsid[] = "@(#)odsyntax.c	8.2 (Berkeley) 5/4/95";
 #endif /* not lint */
-#ifdef __rtems__
-/* For asprintf() visibility */
-#define _GNU_SOURCE
-#endif /* __rtems__ */
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD: src/usr.bin/hexdump/odsyntax.c,v 1.17 2004/07/22 13:14:42 johan Exp $");
 #endif

cpukit/libmisc/shell/main_date.c

@@ -12,11 +12,12 @@
  *  http://www.rtems.org/license/LICENSE.
  */
 
+#define _XOPEN_SOURCE
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#define _GNU_SOURCE
 #include <stdio.h>
 #include <unistd.h>
 #include <string.h>

cpukit/libmisc/shell/main_dd.c

@@ -31,6 +31,8 @@
  * SUCH DAMAGE.
  */
 
+#define _GNU_SOURCE
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -49,7 +51,6 @@ static char sccsid[] = "@(#)dd.c	8.5 (Berkeley) 4/2/94";
 __FBSDID("$FreeBSD: src/bin/dd/dd.c,v 1.43 2004/08/15 19:10:05 rwatson Exp $");
 #endif
 
-#define _GNU_SOURCE
 #include <rtems.h>
 #include <rtems/shell.h>
 #include <rtems/shellconfig.h>

cpukit/posix/src/pthreadattrgetaffinitynp.c

@@ -14,13 +14,14 @@
  *  http://www.rtems.org/license/LICENSE.
  */
 
+#define  _GNU_SOURCE
+
 #if HAVE_CONFIG_H
 #include "config.h"
 #endif
 
 #if HAVE_DECL_PTHREAD_ATTR_GETAFFINITY_NP
 
-#define  _GNU_SOURCE
 #include <pthread.h>
 #include <errno.h>
 

cpukit/posix/src/pthreadattrsetaffinitynp.c

@@ -1,7 +1,3 @@
-#if HAVE_CONFIG_H
-#include "config.h"
-#endif
-
 /**
  * @file
  *
@@ -18,9 +14,14 @@
  *  http://www.rtems.org/license/LICENSE.
  */
 
+#define  _GNU_SOURCE
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #if HAVE_DECL_PTHREAD_ATTR_SETAFFINITY_NP
 
-#define  _GNU_SOURCE
 #include <pthread.h>
 #include <errno.h>
 

cpukit/posix/src/pthreadgetaffinitynp.c

@@ -14,6 +14,7 @@
  *  http://www.rtems.org/license/LICENSE.
  */
 
+#define  _GNU_SOURCE
 
 #if HAVE_CONFIG_H
 #include "config.h"
@@ -21,7 +22,6 @@
 
 #if HAVE_DECL_PTHREAD_GETAFFINITY_NP
 
-#define  _GNU_SOURCE
 #include <pthread.h>
 #include <errno.h>
 

cpukit/posix/src/pthreadgetattrnp.c

@@ -14,11 +14,12 @@
  *  http://www.rtems.org/license/LICENSE.
  */
 
+#define  _GNU_SOURCE
+
 #if HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#define  _GNU_SOURCE
 #include <pthread.h>
 #include <errno.h>
 #include <string.h>

cpukit/posix/src/pthreadgetnamenp.c

@@ -6,11 +6,12 @@
  * http://www.rtems.org/license/LICENSE.
  */
 
+#define _GNU_SOURCE
+
 #if HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#define _GNU_SOURCE
 #include <pthread.h>
 #include <errno.h>
 #include <string.h>

cpukit/posix/src/pthreadsetaffinitynp.c

@@ -14,13 +14,14 @@
  *  http://www.rtems.org/license/LICENSE.
  */
 
+#define  _GNU_SOURCE
+
 #if HAVE_CONFIG_H
 #include "config.h"
 #endif
 
 #if HAVE_DECL_PTHREAD_SETAFFINITY_NP
 
-#define  _GNU_SOURCE
 #include <pthread.h>
 #include <errno.h>
 

cpukit/posix/src/pthreadsetnamenp.c

@@ -6,11 +6,12 @@
  * http://www.rtems.org/license/LICENSE.
  */
 
+#define _GNU_SOURCE
+
 #if HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#define _GNU_SOURCE
 #include <pthread.h>
 #include <errno.h>