Solve warning about redefined _GNU_SOURCE, allow iconv to build

utils/Makefile.in

@@ -20,7 +20,8 @@ endif
 
 CFLAGS-ldd := $(CFLAGS-utils-common) $(CFLAGS-utils-shared) -D_GNU_SOURCE
 
-CFLAGS-iconv := $(CFLAGS-utils-shared) -DL_iconv_main
+# needs CFLAGS-utils explicitely, because the source file is not located in utils
+CFLAGS-iconv := $(CFLAGS-utils) $(CFLAGS-utils-shared) -DL_iconv_main
 
 CFLAGS-readelf := $(CFLAGS-utils-shared)
 

utils/ldd.c

@@ -26,7 +26,9 @@
  *
  */
 
-#define _GNU_SOURCE
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
 #include <stdlib.h>
 #include <stdio.h>
 #include <fcntl.h>