[LEDE-DEV] [PATCH] _GNU_SOURCE should be defined for building vs uClibc

[Alexey Brodkin]

In uClibc-ng O_PATH and O_DIRECTORY are only defined if _GNU_SOURCE is
defined.

So explicitly define _GNU_SOURCE in sources that use O_PATH and
O_DIRECTORY.

Without that extra definition that's what happens when building procd.

utils/utils.c:
------------------------->8----------------------
.../openwrt/build_dir/target-arc_arc700_uClibc-1.0.14/procd-2016-05-19/utils/utils.c:
In function 'patch_fd':
.../openwrt/build_dir/target-arc_arc700_uClibc-1.0.14/procd-2016-05-19/utils/utils.c:168:22:
error: 'O_PATH' undeclared (first use in this function)
   dfd = open("/dev", O_PATH|O_DIRECTORY);
                      ^
.../openwrt/build_dir/target-arc_arc700_uClibc-1.0.14/procd-2016-05-19/utils/utils.c:168:22:
note: each undeclared identifier is reported only once for each function
it appears in
.../openwrt/build_dir/target-arc_arc700_uClibc-1.0.14/procd-2016-05-19/utils/utils.c:168:29:
error: 'O_DIRECTORY' undeclared (first use in this function)
   dfd = open("/dev", O_PATH|O_DIRECTORY);
                             ^
CMakeFiles/init.dir/build.make:182: recipe for target
'CMakeFiles/init.dir/utils/utils.c.o' failed
------------------------->8----------------------

inittab.c:
------------------------->8----------------------
.../openwrt/build_dir/target-arc_arc700_uClibc-1.0.14/procd-2016-05-19/inittab.c:
In function 'dev_exist':
.../openwrt/build_dir/target-arc_arc700_uClibc-1.0.14/procd-2016-05-19/inittab.c:72:21:
error: 'O_PATH' undeclared (first use in this function)
  dfd = open("/dev", O_PATH|O_DIRECTORY);
                     ^
.../git/openwrt/build_dir/target-arc_arc700_uClibc-1.0.14/procd-2016-05-19/inittab.c:72:21:
note: each undeclared identifier is reported only once for each function
it appears in
.../git/openwrt/build_dir/target-arc_arc700_uClibc-1.0.14/procd-2016-05-19/inittab.c:72:28:
error: 'O_DIRECTORY' undeclared (first use in this function)
  dfd = open("/dev", O_PATH|O_DIRECTORY);
                            ^
CMakeFiles/procd.dir/build.make:134: recipe for target
'CMakeFiles/procd.dir/inittab.c.o' failed
make[6]: *** [CMakeFiles/procd.dir/inittab.c.o] Error 1
------------------------->8----------------------

Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
Cc: Waldemar Brodkorb <wbx at openadk.org>
Cc: John Crispin <john at phrozen.org>
Cc: Jo-Philipp Wich <jo at mein.io>
---
 inittab.c     | 1 +
 utils/utils.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/inittab.c b/inittab.c
index 528396e..6dde11a 100644
--- a/inittab.c
+++ b/inittab.c
@@ -12,6 +12,7 @@
  * GNU General Public License for more details.
  */
 
+#define _GNU_SOURCE
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>
diff --git a/utils/utils.c b/utils/utils.c
index e2e3396..8f14aad 100644
--- a/utils/utils.c
+++ b/utils/utils.c
@@ -12,6 +12,7 @@
  * GNU General Public License for more details.
  */
 
+#define _GNU_SOURCE
 #include <libubox/avl.h>
 #include <libubox/avl-cmp.h>
 #include "utils.h"
-- 
2.5.5