tools/Makefile: Move _GNU_SOURCE to Makefile

Commit 669dfc2e adds libfdt_env.h to HOSTCPPFLAGS. It causes stdio.h
to be included before _GNU_SOURCE is defined in C files. On some old hosts
some prototypes are protected by #ifdef __USE_GNU, which is set when
_GNU_SOURCE is defined.

Signed-off-by: York Sun <yorksun@freescale.com>
Acked-by: Simon Glass <sjg@chromium.org>

tools/Makefile

@@ -154,6 +154,7 @@ NOPEDOBJS := $(addprefix $(obj),$(NOPED_OBJ_FILES-y))
 #
 # Use native tools and options
 # Define __KERNEL_STRICT_NAMES to prevent typedef overlaps
+# Define _GNU_SOURCE to obtain the getline prototype from stdio.h
 #
 HOSTCPPFLAGS =	-include $(SRCTREE)/include/libfdt_env.h \
 		-idirafter $(SRCTREE)/include \
@@ -163,7 +164,8 @@ HOSTCPPFLAGS =	-include $(SRCTREE)/include/libfdt_env.h \
 		-I $(SRCTREE)/tools \
 		-DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE) \
 		-DUSE_HOSTCC \
-		-D__KERNEL_STRICT_NAMES
+		-D__KERNEL_STRICT_NAMES \
+		-D_GNU_SOURCE
 
 
 all:	$(obj).depend $(BINS) $(LOGO-y) subdirs

tools/aisimage.c

@@ -5,9 +5,6 @@
  * SPDX-License-Identifier:	GPL-2.0+ 
  */
 
-/* Required to obtain the getline prototype from stdio.h */
-#define _GNU_SOURCE
-
 #include "mkimage.h"
 #include "aisimage.h"
 #include <image.h>

tools/imximage.c

@@ -9,9 +9,6 @@
  * SPDX-License-Identifier:	GPL-2.0+ 
  */
 
-/* Required to obtain the getline prototype from stdio.h */
-#define _GNU_SOURCE
-
 #include "mkimage.h"
 #include <image.h>
 #include "imximage.h"

tools/kwbimage.c

@@ -6,9 +6,6 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
-/* Required to obtain the getline prototype from stdio.h */
-#define _GNU_SOURCE
-
 #include "mkimage.h"
 #include <image.h>
 #include "kwbimage.h"

tools/mkenvimage.c

@@ -9,9 +9,6 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
-/* We want the GNU version of basename() */
-#define _GNU_SOURCE
-
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>

tools/omapimage.c

@@ -14,9 +14,6 @@
  * SPDX-License-Identifier:	GPL-2.0+ 
  */
 
-/* Required to obtain the getline prototype from stdio.h */
-#define _GNU_SOURCE
-
 #include "mkimage.h"
 #include <image.h>
 #include "omapimage.h"

tools/pblimage.c

@@ -3,8 +3,6 @@
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
-#define _GNU_SOURCE
-
 #include "mkimage.h"
 #include <image.h>
 #include "pblimage.h"

tools/ublimage.c

@@ -13,9 +13,6 @@
  * SPDX-License-Identifier:	GPL-2.0+ 
  */
 
-/* Required to obtain the getline prototype from stdio.h */
-#define _GNU_SOURCE
-
 #include "mkimage.h"
 #include <image.h>
 #include "ublimage.h"