Branch b1_8_gate

Quiet compiler warnings due to duplicate #define of _GNU_SOURCE.

lustre/utils/lr_reader.c

@@ -22,7 +22,9 @@
  */
  /* Safely read the last_rcvd file from a device */
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>