Makefile: Have portable_endian.h properly expose all functions

For Linux, this requires additional #defines, see
https://gist.github.com/panzi/6856583#gistcomment-1656524

Placing those #defines into portable_endian.h would mean we
depend on the specific order of #includes (whatever pulls
in endian.h first, including other system includes). Avoid
this by using symbols provided "globally" via the Makefile.

Also nuke the _NETBSD_SOURCE definition in fel.c

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Makefile

@@ -18,9 +18,16 @@
 
 CC = gcc
 CFLAGS = -g -O0 -Wall -Wextra
-CFLAGS += -std=c99 -D_POSIX_C_SOURCE=200112L
+CFLAGS += -std=c99 $(DEFINES)
 CFLAGS += -Iinclude/
 
+DEFINES = -D_POSIX_C_SOURCE=200112L
+# Define _BSD_SOURCE, necessary to expose all endian conversions properly.
+# See http://linux.die.net/man/3/endian
+DEFINES += -D_BSD_SOURCE
+# glibc 2.20+ also requires _DEFAULT_SOURCE
+DEFINES += -D_DEFAULT_SOURCE
+
 # Tools useful on host and target
 TOOLS = sunxi-fexc sunxi-bootinfo sunxi-fel sunxi-nand-part
 

fel.c

@@ -15,12 +15,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-/* Needs _BSD_SOURCE for htole and letoh  */
-/* glibc 2.20+ also requires _DEFAULT_SOURCE */
-#define _DEFAULT_SOURCE
-#define _BSD_SOURCE
-#define _NETBSD_SOURCE
-
 #include <libusb.h>
 #include <stdint.h>
 #include <stdbool.h>

phoenix_info.c

@@ -15,11 +15,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-/* Needs _BSD_SOURCE for htole and letoh  */
-/* glibc 2.20+ also requires _DEFAULT_SOURCE */
-#define _DEFAULT_SOURCE
-#define _BSD_SOURCE
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

pio.c

@@ -17,11 +17,6 @@
  * MA 02111-1307 USA
  */
 
-/* needs _BSD_SOURCE for htole and letoh  */
-/* glibc 2.20+ also requires _DEFAULT_SOURCE */
-#define _DEFAULT_SOURCE
-#define _BSD_SOURCE
-
 #include <errno.h>
 #include <stdio.h>
 #include <stdint.h>